OBS2017

2017 Visual & CCD Observations
Año 2017 – Observaciones Visuales y CCD / DSLR de Cometas
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C/2017 T1 (Heinze)
2017 Dec. 27.966 TU: m1=10.8, Dia.=1′, DC=4, ... 20×80 B ... Neil Norman FRAS (Ipswich, England)
2017 Dec. 23.64 UT: m1=11.8, Dia.=1.5’, DC=4/5, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter, coma elongated to the West approximately. Central condensation sometimes appears stellar in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2017 Dec. 20.15 UT: m1=11.1, Dia.=4′, DC=2, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM: 21.4]
2017 Dec. 18.73 UT: m1=13.3, Dia.=1.0′, DC=3/, ... 40.0-cm L f/4.5 (144x) ... Seiichi Yoshida (Ibaraki, Japan)
2017 Dec. 16.08 UT: m1=12.0, Dia.=2.5′, DC=2/, ... 20-cm SCT (133x) ... Juan Jose Gonzalez (Villacintor, Leon, Spain, Alt. 930 m, 42º 29′ N, 5º 11′ W) [Faint outer coma. Motion checked during a 30-min period. Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.1]
2017 Dec. 14.67 UT: m1=13.5, Dia.=1.3’, DC=2, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, weakly condensed. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2017 Dec. 13.61 UT: m1=13.8, Dia.=1’, DC=2, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

C/2017 S6 (Catalina)
2017 Nov. 22.90 UT: m1=15.6, Dia.=0.2′, DC=3, ... 60-cm L (407x) ... Sandor Szabo (Hungary) [Very fast moving comet, easy to check its path among the stars in 10 minutes]

C/2017 O1 (ASASSN)
2017 Dec. 23.89 UT: m1=12.2, Dia.=2.5′, DC=1, no tail, ... 20-cm SCT (80x) ... Carlos Labordena (Castellón, España)
2017 Dec. 19.44 UT: m1=13.6, Dia.=0.7′, DC=1, ... 40.0-cm L f/4.5 (257x) ... Seiichi Yoshida (Ibaraki, Japan)
2017 Dec. 18.74 UT: m1=13.2, Dia.=1.0′, DC=1, ... 40.0-cm L f/4.5 (144x) ... Seiichi Yoshida (Ibaraki, Japan)
2017 Dec. 16.82 UT: m1=11.5, Dia.=3.5′, DC=1, no tail, ... 20-cm SCT (80x) ... Carlos Labordena (Castellón, España)
2017 Dec. 07.87 UT: m1=10.7, Dia.=3′, DC=1, no tail, ... 20-cm SCT (80x) ... Carlos Labordena (Castellón, España)
2017 Dec. 07.78 UT: m1=10.5, Dia.=3′, DC=2, ... 10-cm B(25x) ... Martin Lehky (Hradec Králové, Czech Republic)
2017 Dec. 06.76 UT: m1=10.8, Dia.=1.5′, DC=2, ... 30.5-cm L (94x) ... J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain)
2017 Dec. 05.77 UT: m1=10.0, Dia.=4′, DC=1/, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Candanedo de Fenar, Leon, Spain, Alt. 1060 m, 42º 49′ N, 5º 34′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2017 Nov. 26.14 UT: m1=10.0, Dia.=5′, DC=2, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2017 Nov. 24.80 UT: m1=11.5, Dia.=1.6′, DC=2, ... 40.0-cm L f/4.5 (75x) ... Seiichi Yoshida (Gunma, Japan)
2017 Nov. 22.71 UT: m1=10.1, Dia.=3′, DC=2, ... 25.4-cm L (64x) ... Maik Meyer (Limburg, Germany)
2017 Nov. 18.77 UT: m1=10.7, Dia.=2.5′, ... 30.5-cm L (94x) ... J. P. Navarro Pina (El Ardal, Murcia, Spain) [Lm = 5.8 , Altitude = 700 mts.]
2017 Nov. 16.78 UT: m1=10.5, Dia.=3′, DC=1/, ... 13-cm L (103.2x) ... Alexsandr Morozov (Novozybkov, Russia) (S – Sidgwick`s method, Lm=6.10)
2017 Nov. 16.25 UT: m1=9.8, Dia.=5′, DC=2/, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2017 Nov. 15.13 UT: m1=09.6, Dia.=6′, DC=2, no tail, ... 20-cm SCT (50x) ... Carlos Labordena (Castellón, España)
2017 Nov. 14.87 UT: m1=11.4, Dia.=2.0′, DC=5, ... 60-cm L (187x) ... Sandor Szabo (Hungary) [Elongated coma, short 2-3’ long tail is seen to PA: 210 deg]
2017 Nov. 14.76 UT: m1=10.5, Dia.=2.0′, DC=1, ... 30.5-cm L (94x) ... J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain) [360 mts altitude]
2017 Nov. 14.23 UT: m1=9.6, Dia.=5′, DC=2/, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, Alt. 1490 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Nov. 13.79 UT: m1=8.9, Dia.=5′, DC=2, ... 25×100 B ... Juan Jose Gonzalez ( Puerto de Aralla, Leon, Spain, Alt. 1490 m, 42º 54′ N, 5º 48′ W ) [ Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2017 Nov. 13.71 UT: m1=9.6, Dia.=3.5´, DC=1/, ... 25.4-cm L f:5 (64x) ... Maik Meyer (Limburg, Germany)
2017 Nov. 11.96 UT: m1=09.2, Dia.=6′, DC=3, no tail, ... 15-cm T (30x) ... Carlos Labordena (Castellón, España)
2017 Nov. 11.95 UT: m1=9.8, Dia.=4.5′, DC=1, ... 20-cm L (63x) ... Valentín Díaz (La Romaneta, Alicante, España)
2017 Nov. 06.75 UT: m1=8.6, Dia.=7′, DC=2/, ... 25×100 B ... Juan Jose Gonzalez (Cruce de Aralla – Embalse de Barrios de Luna, Leon, Spain, Alt. 1110 m, 42º 54′ N, 5º 52′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0. Mountain location, very clear sky]
2017 Nov. 05.86 UT: m1=10.6, Dia.=3′, DC=1, ... 30,5 cm L (94x) ... J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain) [Moonlight Full]
2017 Nov. 02.17 UT: m1=9.2, Dia.=6′, DC=2/, ... 25.4-cm L f:5 (64x) ... Maik Meyer (Limburg, Germany)
2017 Nov. 01.87 UT: m1=10.5, Dia.=3′, DC=2, ... 30.5-cm L (94x) ... J. P. Navarro Pina (El Palmar, Murcia, Spain) [moonlight distance 140º]
2017 Nov. 01.01 UT: m1=9.2, Dia.=5.5′, DC=3, ... 25-cm L (150x) ... Danil Sidorko (Korenovsk, Russia) [SQM = 20.42]
2017 Oct. 30.96 TU: m1=9.4, Dia.=5′, DC=2, ... 29×100 B ... Maik Mayer (Liumburg, Germany)
2017 Oct. 27.96 UT: m1=8.8, Dia.=8-9′, DC=d2-3, ... 15×70 binoculars (m1 and d estimates) and 0.40-m Reflector f/4.4 (56x) ...  Gabor Santa (Göd, Hungary) [Drop-like inner coma, contains very inner disk, round outer coma. Very interesting that the sight is identical as in a 10 cm achromat, but its brighter. But the parameters are identical]
2017 Oct. 26.64 UT: m1=9.9, Dia.=5′, DC=1, ... 40.0-cm L f/4.5 (36x) ... Seiichi Yoshida (Gunma, Japan)
2017 Oct. 24.94 UT: m1=10.0, Dia.=6′, DC=2, ... 13-cm L (65x) ... Alexsandr Morozov (Novozybkov, Russia) (S – Sidgwick`s method, Lm=6.13)
2017 Oct. 22.90 UT: m1=8.3, Dia.=8′, DC=2/, ... 25×100 B ... Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Oct. 21.02 UT: m1=8.9, Dia=7′, DC=3, no tail, ...  15-cm T (30x) ...  Carlos Labordena (Castellón, España)
2017 Oct. 21.01 UT: m1=8.7, Dia=7′, DC=2, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Oct. 20.09 UT: m1=9.9, Dia.=5′, DC=2/, ...  13-cm L (65x) ...  Alexsandr Morozov (Novozybkov, Russia) (Lm=6.14)
2017 Oct. 17.81 TU m1=8.6, dia.=6′, DC=2/, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 Oct. 16.97 UT: m1=8.8, Dia=6′, DC=3, no tail, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 Oct. 16.96 UT: m1=8.5, Dia=7′, DC=2, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Oct. 16.89 UT: m1=8.8, Dia.=7′, ...  20.3-cm L f/5.9 ...  Mieczyslaw Leszek Paradowski (Jabłonna, Poland)
2017 Oct. 16.82 UT: m1=8.8, Dia.=7′, ...  25×100 B ...  Mieczyslaw Leszek Paradowski (Jabłonna, Poland)
2017 Oct. 16.81 TU m1=8.6, dia.=6′, DC=2/, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 Oct. 15.81 TU m1=8.5, dia.=7′, DC=3, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 Oct. 14.00 UT: m1=8.3, Dia.=7′, DC=2/, ...  25×100 B ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In 20 cm SCT (77x) : m1=8.5, Dia.=7′, DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Oct. 13.97 UT: m1=8.6, Dia=6′, DC=2, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Oct. 13.89 UT: m1=8.8, Dia.=7′, DC=d2-3, ...  0.10-m refractor achromat f/5 (20x, 55x) ...  Gabor Santa (Göd, Hungary) [Round coma vith a drop-like inner structure, central disk]
2017 Oct. 13.81 TU m1=8.6, dia.=7′, DC=2/, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 Oct. 12.81 TU m1=8.7, dia.=6.5′, DC=2/, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 Oct. 10.90 UT: m1=8.3, Dia.=7′, DC=3, ...  25×100 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1490 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2017 Oct. 03.19 UT: m1=8.1, Dia.=11′, DC=3, ...  10×50 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1490 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Oct. 03.05 UT: m1=9.4, Dia.=7′, DC=3, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia) (S – Sidgwick`s method, Lm=6.45)
2017 Oct. 02.01 UT: m1=9.2, Dia.=9.3′, DC=3/, ...  25-cm L (70x) ...  Danil Sidorko (Korenovsk, Russia) [SQM= 21.10]
2017 Oct. 01.29 UT: m1=9.5, Dia.=5′, DC=2/, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Sep. 30.90 UT: m1=8.8 DSLR, Dia.=13′.2, ...  3.4-cm A + DSLR V f/4 ...  Mieczyslaw Leszek Paradowski (Zatwarnica, Poland) [tail: 0.13 deg in p.a. 245 deg, ...  NELM: 6.0, moonlight, temp.+3C, ...  Bieszczady mountains: elevation 535m]
2017 Sep. 29.96 TU m1=9.3, dia.=5′, DC=3, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 Sep. 27.63 UT: m1=9.5, Dia.=6.7’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter. Coma diffuse with semi-transparent outer coma, opaque inner coma. Slight interference from faint stars in coma. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= S, ...  Cat= TK]
2017 Sep. 27.12 TU m1=9.6, dia.=5′, DC=3/, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 Sep. 25.69 UT: m1=9.5, Dia.=8′, DC=2, ...  40.0-cm L f/4.5 (36x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Sep. 25.01 UT: m1=8.3, Dia.=10′, DC=3, ...  10×50 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1490 m, 42º 54′ N, 5º 48′ W) [In 25x100B : m1=8.5, Dia.=9′, DC=2/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Sep. 21.93 UT: m1=9.4, Dia.=4′, DC=2/, ...  13-cm L (65x) ...  Alexsandr Morozov (Novozybkov, Russia)(S – Sidgwick`s method, Lm=5.95)
2017 Sep. 21.73 UT: m1=9.5, Dia.=11.4’, DC=3/4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Outer coma semi-transparent, inner coma opaque and moderately condensed. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Sep. 20.04 UT: m1=9.0, Dia=7′, DC=2, no tail, ...  20-cm T (64x) ...  Carlos Labordena (Castellón, España)
2017 Sep. 18.95 UT: m1=9.0, Dia.=5′, DC=3, ...  13-cm L (65x) ...  Alexsandr Morozov (Novozybkov, Russia) (S – Sidgwick`s method)
2017 Sep. 17.09 UT: m1=8.7, Dia=7′, DC=2, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Sep. 17.08 UT: m1=8.9, Dia=7′, DC=3, no tail, ...  15-cm T (30x) ...  Carlos Labordena (Castellón, España)
2017 Sep. 16.01 UT: m1=8.2, Dia.=9′, DC=3, ...  10×50 B, ...  Juan Jose Gonzalez (Cruce de Aralla – Embalse de Barrios de Luna, Leon, Spain, ...  Alt. 1110 m, 42º 54′ N, 5º 52′ W) [In 25x100B : m1=8.3, Dia.=9′, DC=2/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2017 Sep. 15.21 UT: m1=9.3, Dia.=5′, DC=3/, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Sep. 03.002 UT: m1=9.6, Dia.=3.5′, DC=3, ...  25-cm L (150x) ...  Danil Sidorko (Korenovsk, Russia) [SQM = 21.65]
2017 Sep. 02.15 UT: m1=9.3, Dia=5′, DC=3, no tail, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 Sep. 01.75 UT: m1=10.0, Dia.=6.4’, DC=3/4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma opaque in centre, gradually fades to edges, pale aqua-blue in colour. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Sep. 01.09 UT: m1=8.6, Dia.=8′, DC=3, ...  25×100 B ...  Juan Jose Gonzalez (Alcuetas – Villabraz, Leon, Spain, ...  Alt. 885 m, 42º 16′ N, 5º 27′ W) [In 20 cm SCT (77x) : m1=9.1, Dia.=6′, DC=3/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Sep. 01.01 UT: m1=10.0, Dia.=3′, DC=2/, ...  13-cm L (65x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Aug. 30.71 UT: m1=9.9, Dia.=5.8’, DC=4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter, diffuse coma with opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Aug. 30.09 UT: m1=9.1, Dia.=5′, ...  6.8-cm R f/5.9 ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland) [comet alt. +43deg, ...  dawn]
2017 Aug. 30.04 UT: m1=9.4, Dia.=5′, DC=3, ...  25×100 B ...  Martin Lehky (Hradec Kralove, Czech Republic)
2017 Aug. 29.08 UT: m1=9.5, Dia.=5′, DC=3, ...  25×100 B ...  Martin Lehky (Hradec Kralove, Czech Republic)
2017 Aug. 25.62: UT: m1=9.6:, ...  25×100 B ...  David A. J. Seargent (Cowra, NSW, Australia) [Somewhat enhanced using Swan Band filter]
2017 Aug. 25.15 UT: m1=8.7, Dia.=8′, DC=3, ...  25×100 B ...  Juan Jose Gonzalez (Puerto del Pando – Prioro, Leon, Spain, ...  Alt. 1430 m, 42º 56′ N, 4º 57′ W) [In 20-cm SCT (77x) : m1=9.0, Dia.=6′, DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2017 Aug. 22.21 UT: m1=9.9, Dia.=4′, DC=4, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Aug. 21.11 UT: m1=8.8, Dia.=7′, DC=3, ...  25×100 B ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In 20-cm SCT (77x): m1=9.0, Dia.=6′, DC=3/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Aug. 22.07 UT: m1=9.6 DSLR, Dia.=5.4′, ...  5-cm A + DSLR V f/4 ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland) [comet alt. +34deg, ...  dawn]
2017 Aug. 19.72 UT: m1=9.5, Dia.=6’, DC=4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma large and diffuse, opaque centre, moderately condensed. Enhances well in Swan Band filter, pale aqua-blue in colour. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Aug. 19.01 UT: m1=10.7, Dia.=2.5′, DC=s4, ...  0.60-m L (184x) ...  Gabor Santa (Hungary) [m2=15:, Huge coma with dim nucleus]
2017 Aug. 17.67 UT: m1=9.9, Dia.=5.5’, DC=3/4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Enhances strongly in Swan Band filter. Inner coma opaque, moderately condensed. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Aug. 17.03 UT: m1=9.1, Dia.=5′, DC=3/, ...  20-cm SCT (77x) ...  (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Before moonrise. Altitude: 11 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2017 Aug. 01.74 UT: m1=9.8, Dia.=7.5’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter, ...  Outer coma semi-transparent, inner coma diffuse and opaque with a faint stellar centre visible in good seeing.Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Aug. 01.71 UT: m1=9.6, Dia.=10′, DC=2, ...  25×100 B ...  David A. J. Seargent (Cowra, NSW, Australia) [Moderately enhanced using Swan Band filter]
2017 Aug. 01.23 UT: m1=10.1, Dia.=4′, DC=3, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Slight enhancement with Swan band filter]
2017 Aug. 01.06 UT: m1=10.3, Dia.=5′, DC=3, ...  25×100 B ...  Martin Lehky (Hradec Kralove, Czech Republic)
2017 July 30.12 UT: m1=10.1, Dia=11′, DC=2, no tail, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 July 25.77 UT: m1=9.9, Dia.=9.6’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma large and diffuse, enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= S, ...  Cat= TK]
2017 July 24.75 UT: m1=10.0, Dia.=7’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma large, enhances well in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= S, ...  Cat= TK]
2017 July 23.13 UT: m1=9.8, Dia.=5′, DC=2/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Brighter than expected. Diffuse object with faint outer coma. Field stars checked in DSS. Altitude: 17 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]

C/2017 K6 (Jacques)
2017 Dec. 13.65 UT: m1=14.0, Dia.=0.8’, DC=5/6, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma faintly stellar in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Dec. 07.44 UT: m1=14.2, Dia.=0.9’, DC=3, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. Sometimes faintly stellar in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Nov. 09.45 UT: m1=14.5, Dia.=0.5’, DC=2/3, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Nov. 08.45 UT: m1=14.7, Dia.=0.5’, DC=2/3, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. Difficult due to proximity to mag 13.1 star. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 30.72 UT: m1=14.7, Dia.=0.3’, DC=2, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, visible as a tiny misty patch with a slightly brighter centre in good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]

C/2017 E4 (Lovejoy) desintegrated
2017 Apr. 24.15 UT: m1=9.4, Dia.=3′, DC=2, Tail= 6′, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 23.02 UT: m1=10.6, Dia.=3′, DC=2/, ...  13-cm L (65x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Apr. 21.16 UT: m1=9.2, Dia.=3′, DC=2/, Tail= 0.2 deg. in PA: 320 deg., ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [No observable central condensation. The comet shows a significant fading and lower DC in comparison with my previous Apr. 7.17 observation. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3 at zenith. Altitude: 12 deg. Mountain  location, very clear sky]
2017 Apr. 18.03 UT: m1=11.0 CCD, Dia.=0.90, DC=7/, Tail=10′ in PA: 316 deg., ...  0.25-m f/4.7 reflector + CCD ...  Serguey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Apr. 08.18 UT: m1=6.9, Dia.=18′, DC=6, ...  20×80 B ...  J. P. Navarro Pina / Manuel Hernandez (Puerto Cadena, Murcia, Spain) [Comet very condensed and bright, altitude 400 mts]
2017 Apr. 07.17 UT: m1=7.0, Dia.=6′, DC=7, no tail, ...  8-cm B(11x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 07.17 UT: m1=7.1, Dia.=5′, DC=7, ...  10×50 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Morris method. Tycho-2 comparison stars. SQM: 21.0 at zenith. Altitude: 17 deg. In 20 cm SCT(77x): Ion tail 0.6-deg in PA 280 deg.  Mountain  location, very clear sky]
2017 Apr. 05.79 UT: m1=7.4, Dia.=8.4’, DC=6, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Interference by twilight, ...  Low altitude = 6.8°. Coma diffuse with stellar centre. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Apr. 05.36 UT: m1=6.5, Dia.=5′, DC=5, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Civil twilight: Sun altitude: -11º / Comet altitude: 16º]
2017 Apr. 05.06 UT: m1=7.0, Dia.=4′, DC=7, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Apr. 04.36 UT: m1=6.3, Dia.=6′, DC=5, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Civil twilight / Sun altitude: -11º]
2017 Apr. 04.16 UT: m1=6.9, Dia.=4′, DC=7, ...  10×50 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Morris method. Tycho-2 comparison stars. SQM: 21.5 at zenith. Altitude: 14 deg. In 20 cm SCT(77x): Ion tail 0.9-deg in PA 270 deg. Mountain  location, very clear sky]
2017 Apr. 03.34 UT: m1=6.5, Dia.=5′, DC=7, ...  15×70 B ...  Willian Souza (Sao Paulo, Brazil)
2017 Apr. 03.07 UT: m1=7.2, Dia.=5′, DC=6, ...  6-cm B (20x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Apr. 02.18 UT: m1=8.5, Dia.=8′, DC=6, no tail, ...  20-cm SCT(50x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 02.17 UT: m1=8.3, Dia.=7′, DC=5, no tail, ...  8-cm B(11x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 02.09 UT: m1=6.8, Dia.=5.5′, DC=5/, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.) [Nice, well condensed object with an elongated coma. Low altitude: 11.9 deg. above the horizon. Corrected for an atmospheric extinction by using “average” table.]
2017 Apr. 01.86 UT: m1=7.1, Dia.=7′, DC=6, ...  10-cm f/4 L (20x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Apr. 01.76 UT: m1=7.3, Dia.=8.3’, DC=6, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Coma shows bright inner coma with stellar centre, diffuse outer coma. Enhances well in Swan Band filter. Low altitude= 10.1°. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Apr. 01.17 UT: m1=7.4, Dia.=5′, DC=7, ...  10×50 B ...  Juan Jose Gonzalez (Candanedo de Fenar, Leon, Spain, ...  Alt. 1060 m, 42º 49′ N, 5º 34′ W) [Morris method. Tycho-2 comparison stars. SQM: 21.4 at zenith. Altitude: 14 deg. Mountain location, very clear sky]
2017 Mar. 31.87 UT: m1=7.4, Dia.=6.5′, DC=6, ...  10-cm f/4 L (20x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 30.34 UT: m1=7.1, Dia.=8′, DC=6, ...  7×50 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Mar. 30.34 UT: m1=7.2, Dia.=6′, DC=6/, Tail= 0.2º PA: 270 deg., ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Mar. 29.77 UT: m1=7.6, Dia.=3.5’, DC=6, ...  25×100 B ...  Michael Mattiazzo (Swan Hill, Vic, Australia)
2017 Mar. 29.34 UT: m1=7.2, Dia.=8′, DC=7, ...  7×50 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Mar. 29.34 UT: m1=7.3, Dia.=6′, DC=7, Tail= 0.2º PA: 280 deg., ...  20 x 100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Mar. 29.18 UT: m1=8.6, Dia.=5′, DC=5, no tail, ...  8-cm B(11x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 28.18 UT: m1=9.1, Dia.=2.5′, DC=6, no tail, ...  20-cm SCT(50x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 28.18 UT: m1=7.9, Dia.=5′, DC=6/, ...  10×50 B ...  Juan Jose Gonzalez (Collado del Fresno, Asturias, Spain, ...  Alt. 1280 m, 43º 10′ N, 5º 54′ W) [Morris method. Tycho-2 comparison stars. SQM: 21.5 at zenith. Altitude: 14 deg. In 20 cm SCT(77x): m1=8.1. Mountain location, very clear sky]
2017 Mar. 28.14 UT: m1=7.8, Dia.=3.5’, DC=5/, ...  15.5-cm L (29x) ...  Reinder Bouma (Burlage, Germany)
2017 Mar. 27.77 UT: m1=8.6, Dia.=3’, DC=4, ...  25×100 B ...  Michael Mattiazzo (Swan Hill, Vic, Australia)
2017 Mar. 27.73 UT: m1=9.1, Dia.=2.4’, DC=6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma enhances in Swan Band filter, faint stellar central condensation, low altitude = 13.9°. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Mar. 27.11 UT: m1=10.5, Dia.=1.8′, DC=3, ...  60-cm L (188x) ...  Sandor Szabo (Hungary)
2017 Mar. 25.77 UT: m1=9.0, Dia.=3.5’, DC=4, ...  25×100 B ...  Michael Mattiazzo (Swan Hill, Vic, Australia) [brightening rapidly]
2017 Mar. 25.34 UT: m1=9.3, Dia.=5′, DC=4/, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [enhanced image with Swan band filter]
2017 Mar. 24.85 UT: m1=9.2, Dia.=5.5′, DC=4, ...  10-cm f/4 L (20x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 20.21 UT: m1=8.6, Dia.=4.5′, DC=3, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º  48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8 at zenith. Significantly brighter than expected. Wide and diffuse coma. Followed for 40 min. Motion obvious. Some moonlight interference (phase 0.54). Altitude: 13 deg. Limiting star magnitude near comet: 12.5 (APASS). Field stars checked in DSS. Mountain location, very clear sky]

C/2017 E1 (Borisov)
2017 Apr. 30.35 UT: m1=10.9, Dia.=2′, DC=4, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Apr. 28.79 UT: m1=11.0, Dia.=1.3’, DC=4, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Close to bright star, slight interference. Outer coma diffuse with a brighter moderately condensed inner coma. Zodiacal light interference. Low altitude = 17.0°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Apr. 07.19 UT: m1=7.9, Dia.=6′, DC=2, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. Altitude: 6 deg. A hint of tail was observable. Astronomical twilight. Mountain location, very clear sky down to the horizon]
2017 Apr. 05.77 UT: m1=10.9, Dia.=3’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, faint stellar central condensation in good seeing, slight zodiacal light interference. Altitude= 18.1°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Apr. 04.19 UT: m1=8.5, Dia.=5′, DC=2, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. Altitude: 6 deg. Astronomical twilight. Mountain location, very clear sky]
2017 Apr. 01.85 UT: m1=11.2, Dia.=2.4′, DC=3, ...  20-cm f/4 L (45x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Apr. 01.19 UT: m1=8.8, Dia.=4′, DC=2/, ...  25×100 B ...  Juan Jose Gonzalez (Candanedo de Fenar, Leon, Spain, ...  Alt. 1060 m, 42º 49′ N, 5º 34′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4 at zenith. Altitude: 6 deg. Mountain location, very clear sky]
2017 Mar. 31.86 UT: m1=11.0, Dia.=2.2′, DC=3, ...  20-cm f/4 L (45x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 29.35 UT: m1=11.4, Dia.=2.5′, DC=4, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilght]
2017 Mar. 28.20 UT: m1=9.2, Dia.=5′, DC=2, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Collado del Fresno, Asturias, Spain, ...  Alt. 1280 m, 43º 10′ N, 5º  54′ W) [Sidgwick method. Tycho-2 comparison stars. Altitude: 9 deg. Beginning of astronomical twilight. Mountain location, very clear sky]
2017 Mar. 27.74 UT: m1=11.0, Dia.=1.5’, DC=3/4, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma enhances in Swan Band filter, ...  Slight zodiacal light interference. Low altitude = 13.5°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Mar. 20.20 UT: m1=9.7, Dia.=3′, DC=2, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8 at zenith. Altitude: 10 deg. Field stars checked in DSS. Background star of mag 12.4 (GSC) in coma. Some moonlight interference (phase 0.54). Mountain location, very clear sky]
2017 Mar. 09.20 UT: m1=11.2, Dia.=2.5′, DC=2, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Cea, Leon, Spain, ...  Alt. 880 m, 42º 28′ N, 5º  0′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3 at zenith. Faint and diffuse outer coma. Altitude: 12 deg. Field stars checked in DSS. Rural dark sky location, clear sky]
2017 Mar. 05.49 UT: m1=13.1:, Dia.=1.6’, DC=1-2, ...  41-cm L (70x) ...  Alan Hale (Cloudcroft, New Mexico, USA) [Vague and diffuse, ...  motion obvious within a few minutes in the rich star field]

C/2016 VZ18 (PANSTARRS)
2017 Mar. 26.81 UT: m1=14.7, Dia.=0.7′, DC=1, ...  60-cm L (244x) ...  Sandor Szabo (Hungary) [Motion was checked]
2017 Mar. 19.81 UT: m1=11.8, Dia.=2′, DC=2, no tail, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 15.87 UT: m1=10.8, Dia.=3.5′, DC=2, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Alto del Trichero – Soto y Amío, Leon, Spain, ...  Alt. 1190 m, 42º 46′ N, 5º 53′ W) [Sidgwick method. Tycho-2 comparison stars. Very faint and diffuse outer coma. Nearby field stars checked in DSS. Background star of mag 11.4 (Tycho-2) in coma. Mountain location, very clear sky. SQM: 21.4 at zenith]
2017 Mar. 15.79 UT: m1=13.2:, Dia.=1.2′, DC=3, ...  33-cm L (114x) ...  Piotr Guzik (Koskowa Góra, Poland, ...  Alt. 810 m, 49º 45′ N, 19º 47′ E) [Rather faint and diffuse. SQM-L: 21.0 at zenith. Sidgwick method, APASS comparison stars]
2017 Mar. 02.15 UT: m1=13.6, Dia.=0.7’, DC=~1, ...  41-cm L (229x) ...  Alan Hale (Cloudcroft, New Mexico, USA) [Very vague and diffuse]
2017 Mar. 01.83 UT: m1=13.7, Dia.=1.0′, DC=2, ...  30.5-cm L f:4.9 (150x) ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain) [comet very diffuse, Lm=5,8]
2017 Mar. 01.79 UT: m1=12.2:, Dia.=2.5′, DC=0-1, ...  25.4-cm L (171x) ...  Gabor Santa (Göd, county Pest, Hungary) [nelm:6, 36 deg above horizon, SQM=19.7]
2017 Mar. 01.76 UT: m1=13.8, Dia.=1.0’, DC=2, ...  60-cm L (244x) ...  Sandor Szabo (Hungary) [Immediately seen, very diffuse, motion was checked]
2017 Feb. 25.87 UT: m1=11.3, Dia.=1′, DC=1, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellfort, Castellon, Spain, ...  Alt. 1000 m, SQM=21.6)
2017 Feb. 24.87 UT: m1=10.7, Dia.=3′, DC=1, ...  20-cm SCT (77x) ... Juan Jose Gonzalez (Villasecino, Leon, Spain, Alt. 1220 m, 42º 58′ N, 6º 01’W) [Sidgwick method. Tycho-2 comparison stars. SQM : 21.3 at zenith. Significantly brighter than expected. Very faint and diffuse outer coma. Limiting star magnitude near comet: 14.5 (Henden). Motion checked during a 45-min period. Nearby field stars checked in DSS. Mountain location, very clear sky]
2017 Feb. 24.808 UT: m1=14.2, Dia.=0.5′, DC=3, ...  30-cm T (139x) ...  (Edwin van Dijk) (Burlage, Germany, ...  near sea level) [Sidgwick method. APASS comparison stars]
2017 Feb. 24.806 UT: m1=13.6, Dia.=0.8′, DC=3, ...  30-cm T (139x) ...  Reinder Bouma (Burlage, Germany) [Sidgwick method. APASS comparison stars. Faint, diffuse object with slight condensation. Field checked in DSS. Motion evident after some 10-15 minutes]

C/2016 U1 (NEOWISE)
2017 Jan. 07.27 UT: m1=7.5, Dia.=1.5′, DC=7/, ...  25×100 B ...  Juan Jose Gonzalez (Alto del Castro, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In 20 cm SCT (77x): Tail: 0.1 deg. in PA 310 deg. Morris method. Tycho-2 comparison stars at the same low altitude (8 deg) as the comet. Astronomical twilight. Mountain location, very clear sky]
2017 Jan. 06.19 UT: m1=7.7, Dia.=1.7′, DC=8, ...  11.4-cm L f:5 (40x) ...  Artyom Novichonok (Lososinnoe, Karelia) [Bright, easy, very condensed comet. Unfortunately, there is cloudy forecast for nearest night and I possibly will not see the comet again. I imaged it without tracking but 0.5 deg tail still visible (don’t visible visually)]
2017 Jan. 05.252 UT: m1=7.6, Dia.=4′, DC=5, ...  20×80 B ...  Neil Norman (Ipswich, England)
2017 Jan. 05.25 UT: m1=7.8, Dia.=2′, DC=7, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Jan. 05.18 UT: m1=7.7, Dia.=2.0′, DC=8, ...  11.4-cm L f:5 (40x) ...  Artyom Novichonok (Konchezero, Karelia) [SQM-L ~ 20.2, Alt. 7.5 deg, astronomical twilight, -28 С. Very small and condensed comet]
2017 Jan.. 03.24 UT: m1=8.2, Dia=4′, DC=6, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Jan. 03.18 UT: m1=7.9, Dia.=1.9′, DC=7, ...  20.0-cm L f:5 (80x) ...  Artyom Novichonok (Konchezero, Karelia) [SQM-L ~ 20.6, Alt. 8 deg. Very small and condensed comet]
2017 Jan. 01.26 UT: m1=8.1, Dia.=3′, DC=7, ...  10×50 B ...  Juan Jose Gonzalez (Puerto de las Señales, Leon, Spain, ...  Alt. 1610 m, 43º 05′ N, 5º 14′ W) [Morris method. Tycho-2 comparison stars. SQM: 21.7 at zenith. Altitude: 13 deg. Mountain location, very clear sky]
2017 Jan. 01.24 UT: m1=8.7, Dia=5′, DC=5, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)

C/2016 R2 (PANSTARRS)
2017 Dec. 27.86 UT: m1=10.8 DSLR, Dia.=4′, ...  3.4-cm A + DSLR V, f/4 (1200s) ...  Mieczyslaw Leszek Paradowski (Lublin, Poland) [Cat. UCAC4 (7 solar type comp. stars), ...  m1 measured using Infinite Aparture Method – Error +/-0.1 mag, ...  Moonlight (66% of full), ...  comet alt.+51deg.]
2017 Dec. 23.91 UT: m1=11.7, Dia.=1.5′, DC=3, no tail, ...  20-cm SCT (117x) ...  Carlos Labordena (Castellón, España)
2017 Dec. 23.59 UT: m1=11.2, Dia.=3.5’, DC=3/4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Interference by faint stars in coma, ...  Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Dec. 20.13 UT: m1=10.2, Dia.=5′, DC=2/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3. It is difficult to separate the contribution of the inner ion tail from that of the coma to the total magnitude m1]
2017 Dec. 19.45 UT: m1=11.0, Dia.=2.6′, DC=3, ...  40.0-cm L f/4.5 (75x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Dec. 18.72 UT: m1=11.5, Dia.=2.3′, DC=3, ...  40.0-cm L f/4.5 (75x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Dec. 16.87 UT: m1=12.1, Dia.=1.5′, DC=2, no tail, ...  20-cm SCT (117x) ...  Carlos Labordena (Castellón, España)
2017 Dec. 16.14 UT: m1=10.1, Dia.=5′, DC=2, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Villacintor, Leon, Spain, ...  Alt. 930 m, 42º 29′ N, 5º 11′ W) [Increasing activity. It is difficult to separate the contribution of the inner ion tail from that of the coma to the total magnitude m1. Field stars checked in DSS. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2017 Dec. 15.08 UT: m1=12.3, Dia.=1′, DC=4, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Dec. 14.66 UT: m1=10.8, Dia.=3.8’, DC=3/4, ...  25cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Tail visible 5’ in length in P.A. 100° approximately. coma does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Dec. 13.89 UT: m1=12.1 CCD, Dia.=1.18′, DC=6/, ...  0.25-m f/4.7 reflector + CCD ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Dec. 13.60 UT: m1=11.0, Dia.=3.2’, DC=4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Tail visible 5.6’ in length in P.A. 358° approximately, semi-transparent, ...  Interference by star pair in coma. Coma dims in Swan band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Dec. 11.39 UT: m1=11.4, Dia.=1.8′, DC=3, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Dec. 07.45 UT: m1=11.2, Dia.=2’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Coma appears elongated to the West approximately. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Dec. 06.80 UT: m1=11.7, Dia.=1.5′, DC=3, ...  30.5-cm L (250x) ...  J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain)
2017 Nov. 26.17 UT: m1=11.1, Dia.=2.5′, DC=3, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.2]
2017 Nov. 24.75 UT: m1=12.6, Dia.=1.4′, DC=4, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Nov. 24.67 UT: m1=12.3, Dia.=2.4’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma pale blue in colour and diffuse with an opaque centre, appears elongated to the NW approximately. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Nov. 22.92 UT: m1=11.9, Dia.=1.2′, DC=5, ...  60-cm L (244x) ...  Sandor Szabo (Hungary)
2017 Nov. 16.18 UT: m1=11.7, Dia.=1.3′, DC=3/, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM: 20.9]
2017 Nov. 14.89 UT: m1=13.4, Dia.=0.4′, DC=5, ...  60-cm L (244x) ...  Sandor Szabo (Hungary)
2017 Nov. 14.19 UT: m1=11.8, Dia.=1.3′, DC=3, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1490 m, 42º 54′ N, 5º 48′ W) [Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.0]
2017 Nov. 14.14 UT: m1=12.8, Dia.=1′, DC=3, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Nov. 09.49 UT: m1=12.9, Dia.=1’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Difficult due to glare from bright star at edge of field. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 30.69 UT: m1=12.8, Dia.=2’, DC=2/3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, interference from mag 12.8 star in coma, ...  Slight brightening to centre, does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 27.99 UT: m1=13.5, Dia.=0.7′, DC=1-2, ...  0.40-m Dobsonian f/4.4 (200x) ...  Gabor Santa (Göd, Hungary) [Diffuse. Close (6′) to Berkeley 20 open clulster which was brighter and bigger]
2017 Oct. 26.68 UT: m1=13.2, Dia.=0.7′, DC=3/, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Oct. 03.20 UT: m1=13.2, Dia.=1.1′, DC=3, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.0]
2017 Sep. 27.61 UT: m1=13.9, Dia.=0.6’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, small. Visible in periods of good seeing. Slight haze from dust and bushfire smoke. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 25.73 UT: m1=14.0, Dia.=0.6′, DC=3, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Sep. 21.75 UT: m1=13.8, Dia.=0.9’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, slight brightening to centre. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]

C/2016 N6 (PANSTARRS)
2017 Dec. 18.80 UT: m1=14.2, Dia.=0.5′, DC=5, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Nov. 16.23 UT: m1=13.5, Dia.=0.5′, DC=4, ...  20-cm SCT (206x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.1]
2017 Nov. 14.77 UT: m1=[14.5, ...  60-cm L (187x) ...  Sandor Szabo (Hungary) [Very close to two 12.7 mag stars, something is there, but NEGATIVE]
2017 Nov. 14.71 UT: m1=14.3, Dia.=0.4′, DC=3-4, ...  0.40-m L f/4.4 (360x) ...  Gabor Santa (Göd, Hungary) [comet was seen well, round, with some condensation. 27 deg above horizon, nelm=4.5-5.0]
2017 Sep. 22.80 UT: m1=13.7, Dia.=0.7’, DC=3, ...  60-cm reflector (244x), ...  Sandor Szabo (Sopron, Hungary)
2017 Aug. 18.99 UT: m1=15.0, ...  Dia.=0.35′, DC=0/, ...  0,60-m L (305x) ...  Gabor Santa (Hungary) Checked on a photo taken on the same night and same location by Ákos Nagy Mélykuti.
2017 July 30.93 UT: m1=16.3 CCD, Dia.=0.22′, DC=8, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 Apr. 04.95 UT: m1=17.3 CCD, Dia.=0.33′, DC=8/, ...  0.25-m f/4.7 reflector + CCD ...  Serguey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 17.01 UT: m1=17.4 CCD, Dia.=0.28′, DC=8, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)

C/2016 N4 (MASTER)
2017 Nov. 14.80 UT: m1=15.5, ...  60-cm L (187x) ...  Sandor Szabo (Hungary) [tried to see for half and hour, but NEGATIVE, must be fainter than 15.5 mag]
2017 Nov. 14.73 UT: m1=14.8, Dia.=0.35′ (20″), DC=0-1, ...  0.40-m L f/4.4 (360x) ...  Gabor Santa (Göd, Hungary) [comet is very dim but obvious, round, without condensation. 64 deg above horizon, nelm=5.6]
2017 Oct. 26.65 UT: m1=14.5, Dia.=0.3′, DC=4, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Oct. 13.88 UT: m1=13.7, Dia.=0.5′, DC=4, ...  20-cm SCT (206x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.1]
2017 Oct. 13.79 UT: m1=14.6, Dia.=0.4-0.5′, DC=3-4, ...  0.40-m Dobsonian f/4.4 (257x) ...  Gabor Santa (Göd, Hungary) [relatively big and diffuse, difficult to see]
2017 Sep. 25.71 UT: m1=14.6, Dia.=0.3′, DC=3, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Sep. 22.84 UT: m1=15.7, Dia.=0.4’, DC=2, ...  60-cm reflector (305x) ...  Sandor Szabo (Sopron, Hungary) [A 16.5 mag starlike nucleus is seen. Motion was checked during 20 minutes]
2017 Aug. 21.94 UT: m1=14.8, Dia.=0.4′, DC=0, ...  0.35-m L (351x) ...  Gabor Santa (Hungary) [Bit difficult to see, but I’m sure its real. Movig was detected in a half an hour period. 15,4 mag stars were visible. In this night I got a clear view about NGC 7009 (Saturn nebula) with its lobes, and also about Campbell’s Hydrogen Star, which had really, very-very red colour!]

C/2016 M1 (PANSTARRS)
2017 Nov. 14.75 UT: m1=14.0, Dia.=0.5′, DC=3, ...  60-cm L (244x) ...  Sandor Szabo (Hungary) [Very close to a 13.9 mag star, but easily seen]
2017 Nov. 14.70 UT: m1=13.7, Dia.=0.6′, DC=d4-5, ...  0.40-m L f/4.4 (360x) ...  Gabor Santa (Göd, Hungary) [comet is easy to see, round, with disk-like condensation. 32 deg above horizon, nelm=5.0]
2017 Oct. 26.40 UT: m1=[13.9, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Oct. 13.77 UT: m1=14.0, Dia.=0.5′, DC=3-4, ...  0.40-m Dobsonian f/4.4 (257x) ...  Gabor Santa (relatively big and diffuse, difficult to see Hungary) [easy to see]
2017 Sep. 22.82 UT: m1=14.5, Dia.=0.5’, DC=5, ...  60-cm reflector (305x) ...  Sandor Szabo (Sopron, Hungary)
2017 Aug. 21.83 UT: m1=14.8, Dia.=0.33′, DC=0, ...  0.35-m L (351x) ...  Gabor Santa (Hungary) [Coma is diffuse but very obvious]
2017 Apr. 20.00 UT: m1=16.7 CCD, Dia.=0.20′, DC=7/, ...  0.25-m f/4.7 reflector + CCD ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Apr. 04.99 UT: m1=16.8 CCD, Dia.=0.37′, DC=7/, ...  0.25-m f/4.7 reflector + CCD ...  Serguey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 16.99 UT: m1=16.8 CCD, Dia.=0.28′, DC=8, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 13.99 UT: m1=16.8 CCD, Dia.=0.37′, DC=8/, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)

C/2016 B1 (NEOWISE)
2017 May  21.99 UT: m1=17.6 CCD, Dia.=0.26′, DC=8, ...  25-cm reflector f/4.7 + CCD ...  Sergey Shurpakov (Baran’, Belarus)

C/2016 A8 (LINEAR)
2017 June 17.96 UT: m1=17.9 CCC, Dia.=0.26′, DC=7/, ... 25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)

C/2016 A1 (PANSTARRS)
2017 Dec. 13.98 UT: m1=16.7 CCD, Dia.=0.18′, DC=8, ... 25-cm reflector f/4.7 ... Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 26.85 UT: m1=16.2, Dia.=0.2′, DC=5, ...  60-cm L (407x) ...  Sandor Szabo (Hungary) [Motion was checked]
2017 Feb. 25.88 UT: m1=16.7 CCD, Dia.=0.29′, DC=8/, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)

C/2015 XY1 (Lemmon)
2017 Jan. 25.82 UT: m1=17.6 CCD, Dia.=0.30′, DC=8/, ...  0.25-m f/4.7 reflector + CCD ...  Sergei Shurpakov (C36, Baran’, Belarus)
2017 Jan. 18.89 UT: m1=17.9 CCD, Dia.=0.26′, DC=9, ...  0.25-m f/4.7 reflector + CCD ...  Sergei Shurpakov (C36, Baran’, Belarus)

C/2015 VL62 (Lemmon-Yeung-PANSTARRS)
2017 Sep. 25.50 UT: m1=[13.7, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Sep. 13.81 UT: m1=15.8 CCD, Dia.=0.20′, DC=7, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 Aug. 30.70 UT: m1=13.6, Dia.=0.9’, DC=3, ...  25-cm L f:5 (83x), ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, low altitude= 17.7°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 26.88 UT: m1=15.2 CCD, Dia.=0.26′, DC=8, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 Aug. 23.45 UT: m1=13.9, Dia.=1.1’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 22.14 UT: m1=12.9, Dia.=2′, DC=3, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Aug. 21.92 UT: m1=14.2, Dia.=0.5′, DC=1/, ...  0.35-m L (351x) ...  Gabor Santa (Hungary) [Slightly difficult to see, but its OK. Moving was detected in a 20-min period.]
2017 Aug. 20.89 UT: m1=15.0 CCD, Dia.=0.22′, DC=7/, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 Aug. 19.46 UT: m1=13.7, Dia.=1’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 17.68 UT: m1=13.7, Dia.=0.8’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 16.94 UT: m1=12.3, Dia.=1.5′, DC=3/, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Motion checked over a 20-min period. Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.2]
2017 Aug. 14.97 UT: m1=14.7 CCD, Dia.=0.51′, DC=7/, Tail=2.8′ in PA=73 deg., ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 Aug. 14.47 UT: m1=13.6, Dia.=1’, ...  DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma small and diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 09.96 UT: m1=14.5 CCD, Dia.=0.33′, DC=6/, Tail=0.30′ in PA=90 deg., ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 Aug. 01.74 UT: m1=13.8, Dia.=0.8’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, small central condensation. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 July 31.01 UT: m1=13.7 CCD, Dia.=1.4′, ...  15-cm L + CCD + Rc filter f/4 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland)
2017 July 30.98 UT: m1=14.2 CCD, Dia.=1.4′, ...  15-cm L + CCD + V filter f/4 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland)
2017 July 30.97 UT: m1=14.9 CCD, Dia.=0.26′, DC=7/, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 July 26.97 UT: m1=14.9 CCD, Dia.=0.33′, DC=7/, ...  0.25-m Newton f/4.7 ...  Sergey Shurpakov (Baran’,Belarus)
2017 July 25.76 UT: m1=13.6, Dia.=0.9’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 July 24.73 UT: m1=14.2, Dia.=0.6’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma small and diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 July 22.91 UT: m1=15.2 CCD, Dia.=0.22′, DC=7/, ...  0.25-m Newton f/4.7 ...  Sergey Shurpakov (Baran’,Belarus)
2017 July 05.78 UT: m1=14.7, Dia.=0.3’, DC=2/3, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 June 30.66 UT: m1=14.6, Dia.=0.5’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma small and diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]

C/2015 V2 (Johnson)
2017 Dec. 07.43 UT: m1=13.5, Dia.=1.1’, DC=5/6, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, with faint stellar central condensation in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Nov. 09.46 UT: m1=12.4, Dia.=1.1’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, close to stars. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 19.45 UT: m1=12.2, Dia.=1.7’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre but very weak. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 12.40 UT: m1=12.3, Dia.=1.7’, DC=4, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma does not enhance in Swan Band filter. Coma small with a moderately condensed and opaque centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 22.47 UT: m1=10.9, Dia.=3.9’, DC=2, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight interference by background star in coma. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 19.43 UT: m1=11.4:, Dia.=3.3’, DC=2/3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Magnitude uncertain, ...  stars in coma. Coma very diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 15.41 UT: m1=11.0:, Dia.=2.4’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Magnitude uncertain, ...  close to bright star pairing, difficult to separate from stars. Coma diffuse with opaque centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 07.93 UT: m1=10.4, Dia.=3′, DC=3, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Aug. 23.43 UT: m1=10.3, Dia.=4.2’, DC=5, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Aug. 22.04 UT: m1=9.7, Dia.=4′, DC=3, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Aug. 19.42 UT: m1=10.5, Dia.=3.5’, DC=5, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, moderately condensed centre, enhances slightly in Swan band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Aug. 17.41 UT: m1=10.1, Dia.=3.2’, DC=5, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma centre well condensed, enhances slightly in Swan band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Aug. 14.43 UT: m1=10.1, Dia.=4.8’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, faintly extended to the North approximately. Faint stellar central condensation visible in periods of good seeing. Dims in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Aug. 12.39 UT: m1=9.9, Dia.=4.5’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma fanned to the North approximately, opaque inner coma with faint stellar central condensation visible in periods of good seeing. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Aug. 10.97 UT: m1=9.2, Dia.=6′, DC=2, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Aug. 10.36 UT: m1=9.8, Dia.=3’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse and appears fan shaped to the North approximately, ...  Inner coma opaque with small faint stellar central condensation visible in periods of good seeing. Coma dims slightly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 July 26.06 UT: m1=8.5, Dia.=7′, DC=3, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 July 25.42 UT: m1=9.6, Dia.=4’, DC=6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma dims in Swan Band filter, elongated slightly to the NE. Faint stellar central condensation surrounded by an opaque inner coma and fading to semi-transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 July 22.92 UT: m1=7.8, Dia.=8′, DC=3, ...  25×100 B ...  Juan Jose Gonzalez (Alto del Trichero – Soto y Amio, Leon, Spain, ...  Alt. 1190 m, 42º 46′ N, 5º 53′ W) [Altitude: 7 deg. Several stars in coma, the brightest being mag 9.4 (TK). Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2017 July 20.42 UT: m1=8.8, Dia.=10.3’, DC=3, ...  11×70 B ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, moderately condensed centre. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 July 19.89 UT: m1=8.4, Dia=6′, DC=3, no tail, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 July 15.00 UT: m1=8.2, Dia.=8′, DC=3, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 July 14.93 UT: m1=7.7, Dia.=10′, DC=3/, ...  25×100 B ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 July 14.86 UT: m1=9.3, Dia.=4′, DC=3, ...  30.5-cm L f:5 (97x) ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain)
2017 July 11.38 UT: m1=8.5, Dia.=16’, DC=3, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Moonlight. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= S, ...  Cat= TK]
2017 June 30.60 UT: m1=7.9, Dia.=12.9’, DC=3/4, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, a little interference by background stars. Low altitude = 19.8°. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 June 29.87 UT: m1=8.6, Dia.=5′, DC=3, ...  13-cm L (65x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 June 28.07 UT: m1=7.7, Dia.=12′, DC=3, ...  7×50 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 28.06 UT: m1=7.9, Dia.=10′, DC=3/, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 27.84 UT: m1=8.3, Dia.=5.9′, DC=4, ...  25-cm L (42x, 70x) ...  Danil Sidorko (Korenovsk, Russia) [SQM= 20.22]
2017 June 26.97 UT: m1=8.0:, Dia.=10′, DC=3, ...  7×50 B ...  Willian Souza (Rheinsberg, Germany)
2017 June 26.87 UT: m1=8.2, Dia.=10′, DC=5, ...  20×80 B ... Marek Biely (244 m.a.s.l., Brno, Czech Republic) [Still also a hint of tail visible]
2017 June 26.83 UT: m1=8.3, Dia.=5.5′, DC=4/, ...  25-cm L (42x, 70x) ...  Danil Sidorko (Korenovsk, Russia) [SQM= 21.29]
2017 June 26.50 UT: m1=8.1, Dia.=13’, DC=3/4, ...  7×50 B ...  Chris Wyatt (Moonbi, NSW, Australia) [Coma diffuse, slight brightening to centre. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 June 24.98 UT: m1=7.8, Dia.=10’, DC=2, no tail, ...  10×50 B ...  Alberto Anunziato (Paraná, Argentina) [Met. Sidgwick, Cat. Tycho II. Estrellas de comparación, ...  HIP 69572 y 69414]
2017 June 24.92 UT: m1=8.5, Dia.=5′, DC=3/, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 June 24.86 UT: m1=9.5, Dia.=6′, DC=3, ...  30.5-cm L (97x) ...  J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain)
2017 June 24.45 UT: m1=8.3, Dia.=10.6’, DC=3, ...  10×50 R ...  Chris Wyatt (Moonbi, NSW, Australia) [Coma diffuse, slight brightening to centre. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 June 23.92 UT: m1=8.6, Dia.=4′, DC=3/, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 June 23.90 UT: m1=8.0, Dia.=8′, DC=4, Tail= 11′, ...  15-cm T (30x) ...  Carlos Labordena (Castellón, España)
2017 June 23.05 UT: m1=7.7, Dia.=12′, DC=3, ...  7×50 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 23.04 UT: m1=7.8, Dia.=10′, DC=3/, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 22.46 UT: m1=7.7, Dia.=13’, DC=3, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 June 22.12 UT: m1=7.8, Dia.=10′, DC=3/, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 21.88 UT: m1=10.7 CCD, Dia.=1.30′, DC=6/, ...  15-cm reflector f/3.2 ...  Sergey Shurpakov (Baran’, Belarus)
2017 June 21.52 UT: m1=7.7, Dia.=16.5’, DC=4, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Slight enhancement in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 June 21.00 UT: m1=7.1, Dia.=15′, DC=3/, ...  12×45 monocular ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2017 June 20.92 UT: m1=8.5, Dia.=5′, DC=3/, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 June 20.83 UT: m1=8.2, Dia.=6.2′, DC=3/, ...  25-cm L (42x, 70x) ...  Danil Sidorko (Korenovsk, Russia) [SQM = 21.29]
2017 June 20.49 UT: m1=7.5:, ...  10×50 B ...  David A. J. Seargent (Cowra, NSW, Australia)
2017 June 20.44 UT: m1=7.9, Dia.=12.5’, DC=3/4, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight interference from nearby stars. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 June 19.92 UT: m1=7.7, Dia.=10′, ...  20×60 B ...  Mieczyslaw Leszek Paradowski (Lublin, Poland)
2017 June 19.92 UT: m1=8.4, Dia.=4′, DC=4, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 June 19.87 UT: m1=8.0, Dia.=5′, DC=4/, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia) [Morris’s method, green zone]
2017 June 18.98 UT: m1=8.4, Día.=5´, DC=3, ...  25-cm L (66x) ...  Gonzalo Vargas (Cochabamba, Bolivia) [Se observó alargamiento abierto como abanico de la coma entre un ángulo AP de 46 a 51 grados aproximadamente]
2017 June 18.92 UT: m1=8.4, Dia.=4′, DC=4, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 June 16.90 UT: m1=8.2, Dia.=8′, DC=5, ...  20×80 B ...  Valentín Díaz (La Romaneta, Alicante,España)
2017 June 16.90 UT: m1=10.0 CCD, Dia.=2.05′, DC=6/, ...  15-cm reflector f/3.2 ...  Sergey Shurpakov (Baran’, Belarus)
22017 June 16.83 UT: m1=8.3, Dia.=5.5′, DC=3, Tail= 7′ in PA: 330 deg., ...  25-cm L (42x, 70x), ...  Danil Sidorko (Korenovsk, Russia) [SQM = 20.37]
2017 June 15.89 UT: m1=7.3, Dia.=18′, ...  7×50 B ...  Mieczyslaw Leszek Paradowski (Stróża-Kolonia, Poland)
2017 June 15.37 UT: m1=7.6, Dia.=13.1’, DC=3, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre, semi-transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= S, ...  Cat= TK]
2017 June 14.94 UT: m1=7.2, Dia.=15′, DC=3/, Tail= 0.5 deg. in PA: 340 deg., ...  12×45 monocular ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2017 June 14.90 UT: m1=7.8, Dia.=6.5, DC=4/, ...  10.0-cm B(29x) ...  Maik Meyer (Limburg, Germany)
2017 June 14.88 UT: m1=8.3:, Dia.=3.5′, DC=4, ...  20-cm L f/6 (37x) ...  Marian Legutko (Gliwice, Poland) [bright sky, partly cloudy, ...  Sidgwick method]
2017 June 13.90 UT: m1=8.5, Dia.=6′, DC=4, Tail= 10′, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 June 13.87 UT: m1=7.9, Dia.=6′, DC=4/, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 June 12.92 UT: m1=8.2, Dia.=5′, DC=4, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 June 12.86 UT: m1=10.1, Dia.=5′, DC=6, ...  30.5-cm L f/4.9 (97x) ...  J. P. Navarro Pina (Cañadas de San Pedro, Murcia, Spain) [Sidgwick method. Lm=5.7]
2017 June 11.94 UT: m1=8.2, Dia.=10′, DC=3/, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 09.97 UT: m1=10.0 CCD, Dia.=1.86′, DC=6/, ...  15-cm reflector f/3.2 ...  Sergey Shurpakov (Baran’, Belarus)
2017 June 04.89 UT: m1=8.0, ...  10-cm R (34x) ...  Willian Souza (Sao Paulo, Brazil)
2017 June 03.89 UT: m1=8.0:, ...  10-cm R (34x) ...  Willian Souza (Sao Paulo, Brazil)
2017 June 02.97 UT: m1=7.6, Dia.=9′, DC=4, ...  10×50 B ...  Martin Lehky (Czech Republic)
2017 June 02.89 UT: m1=8.0:, ...  10-cm R (34x) ...  Willian Souza (Sao Paulo, Brazil)
2017 June 02.17 UT: m1=7.5, Dia.=12′, DC=3/, ...  7×50 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 02.16 UT: m1=7.7, Dia.=8′, DC=4/, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 01.97 UT: m1=7.5, Dia.=8′, DC=4/, ...  10.0-cm B(29x) ...  Maik Meyer (Limburg, Germany)
2017 May 31.94 UT: m1=7.6, Dia.=10, DC=4, ...  5-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  31.88 UT: m1=9.3 CCD, Dia.=3.21′, DC=6/, Tail= 20′ in PA: 329 deg. ...  7-cm refractor f/4.5 + CCD, ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  31.86 UT: m1=7.5, Dia.=2.8′, DC=4/, ...  11-cm B(20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  30.87 UT: m1=7.6, Dia.=6′, DC=5/, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 May  30.13 UT: m1=7.8, Dia.=6′, DC=4, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 May  30.01 UT: m1=7.6, Dia.=11′, DC=5, ...  5-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  28.94 UT: m1=7.6, Dia.=11′, DC=5, ...  5-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  28.87 UT: m1=8.0:, Dia.=4′, DC=5, ...  20-cm L F/6 (37x) ...  Marian Legutko (Gliwice, Poland) [bright sky, moderate transparency, increasing cloudcover, ...  no tail visible, ...  Morris method]
2017 May  27.95 UT: m1=7.5, Dia.=12′, ...  30-cm L f/5 ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland) [tail: 1.5 deg in p.a. 320 deg]
2017 May  27.94 UT: m1=7.7, Dia.=10′, DC=4/, ...  5-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  27.93 UT: m1=7.3, Dia.=18′, ...  7×35 B ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland)
2017 May  27.91 UT: m1=7.5 DSLR, Dia.=23′, ...  3.4-cm A + DSLR V f/4 ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland) [tail: 0.99 deg in p.a. 325 deg]
2017 May  27.88 UT: m1=8.2:, Dia.=4′, DC=5, ...  20-cm L F/6 (37x) ...  Marian Legutko (Gliwice, Poland) [bright sky, moderate transparency, ...  no tail visible, ...  Morris method]
2017 May  27.85 UT: m1=7.8, Dia.=5.4′, DC=4, Tail= 8′ in PA 315 deg., ...  25-cm L (42x, 70x) ...  Danil Sidorko (Korenovsk, Russia) [SQM= 20.51]
2017 May  27.84 UT: m1=7.8, Dia.=8′, DC=4, ...  6-cm B (20x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 May  27.42 UT: m1=7.5, Dia.=15’, DC=4, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre, moderately condensed. Coma extended to NW approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 May  27.13 UT: m1=7.8, Dia.=6′, DC=4, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 May  26.90 UT: m1=7.7, Dia.=13′, DC=4/, ...  5-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  26.49 UT: m1=7.7, Dia.=10.0, ...  10×50 B ...  David A. J. Seargent (Cowra, NSW, Australia)
2017 May  26.48 UT: m1=7.6, Dia.=12.1’, DC=4, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, gradual brightening to centre, coma extended to the NW approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 May  26.01 UT: m1=7.7, Dia.=13′, DC=4/, ...  5-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  25.96 UT: m1=7.3, Dia.=18′, DC=7, ...  8×56 B ...  Alex Scholten (Eerbeek, Netherlands)
2017 May  25.90 UT: m1=9.5 CCD, Dia.=3.06′, DC=7/, Tail= 26′ in PA: 320 deg., ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  25.88 UT: m1=7.9, Dia.=4.3′, DC=5, ...  11-cm B (20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  25.03 UT: m1=7.8, Dia.=10′, DC=4/, ...  5-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  24.42 UT: m1=7.8:, Dia.=12’, DC=4, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, 8th magnitude background star in coma visible which interfered with observation. Slight hint of tail to the NW approximately. Low altitude = 18.4°. Easy to locate in a dark sky. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 May  24.41 UT: m1=8.3, Dia.=4.3’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Dust tail visible 10’ in length in P.A. 337° approximately. Low altitude = 16.6°. Transparent outer coma, opaque inner coma, small bright central condensation appears stellar sometimes. Inner coma does not enhance in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 May  24.01 UT: m1=7.1, Dia.=15′, DC=4/, Tail= 0.5 deg. in PA: 320 deg., ...  12×45 monocular ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [The comet shows a much wider coma diameter, providing a brighter m1 estimate in comparison with my previous May 3.12 observation, ...  there is also a lesser influence of the inner dust tail on the magnitude estimate. Sidgwick method. Tycho-2 comparison stars. SQM: 21.5 at zenith]
2017 May  23.89 UT: m1=7.8, Dia.=12′, DC=4, ...  5-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  23.89 UT: m1=8.2, Dia.=6′, DC=4, Tail= 15′, ...  15-cm T (30x) ...  Carlos Labordena (Castellón, España)
2017 May  22.93 UT: m1=7.8, Dia.=12′, DC=3/, ...  5-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  22.92 UT: m1=8.1, Dia.=9′, DC=4, ...  10-cm B(25x) ...  Martin Lehky (Czech Republic)
2017 May  22.87 UT: m1=9.3, Dia.=5′, DC=9, ...  30.5-cm L f/4.9 (47x) ...  J. P. Navarro Pina & Manuel Hernandez (Puerto de la Cadena, Murcia, Spain) [comet very condensed and bright]
2017 May  21.89 UT: m1=8.3, Dia.=6.5′, DC=5/, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 May  21.89 UT: m1=9.3 CCD, Dia.=2.19′, DC=6, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  21.87 UT: m1=7.9, Dia.=6.1′, DC=5, ...  11-cm B (20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  21.50 UT: m1=8.3, Dia.=6.0′, DC=5, Tail= 0.16 degrees in PA: 300 deg., ...  25×100 B ...  David A. J. Seargent (Cowra, NSW, Australia) [Little change using Swan Banf filter, though possibly marginally fainter with filter]
2017 May  20.90 UT: m1=7.3, Dia.=18′, ...  7×35 B ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland)
2017 May  19.91 UT: m1=9.4 CCCD, Dia.=3.21′, DC=7, Tail= 14′ in PA: 309 deg., ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  19.90 UT: m1=7.8, Dia.=7′, DC=5, ...  20×80 B ...  Valentín Díaz (La Hoya, Alicante, España)
2017 May  19.90 UT: m1=8.0, Dia.=11′, DC=3/, ...  5-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  19.89 UT: m1=8.3, Dia.=9′, DC=4, ...  10-cm B(25x) ...  Martin Lehky (Czech Republic)
2017 May  19.89 UT: m1=7.8, Dia.=6.1′, DC=5, ...  11-cm B (20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  19.88 UT: m1=8.4, Dia.=6.5′, DC=4, Tail= 0.2 deg. in PA: 315 deg., ...  20×80 B ...  Marek Biely (Brno, Czech Republic) [Observed through thin high clouds but with almost no interference]
2017 May  19.83 UT: m1=8.3, Dia.=7′, DC=5, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 May  19.81 UT: m1=8.2, Dia.=6.8′, DC=4, Tail= 2.5′ in PA: 300 deg., ...  25-cm L (42x, 70x) ...  Danil Sidorko (Korenovsk, Russia)
2017 May  19.09 UT: m1=8.2, Dia.=12´, DC=4/, ...  25-cm L F/4.5 (66x) ...  Gonzalo Vargas (Cochabamba, Bolivia) [Se observó un alargamiento de la coma en un ángulo AP estimado en 292 grados]
2017 May  18.94 UT: m1=8.0, Dia.=10′, DC=3, ...  5-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  18.93 UT: m1=8.3, Dia.=8′, DC=3, ...  10-cm B(25x) ...  Martin Lehky (Czech Republic)
2017 May  18.91 UT: m1=8.3, Dia.=7′, DC=3/, Tail= 0.3 deg. in PA: 320 deg., ...  20×80 B ...  Marek Biely (Brno, Czech Republic)
2017 May  19.89 UT: m1=8.0, Dia.=5′, DC=4, no tail, ...  8cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 May  19.88 UT: m1=8.3, Dia.=6′, DC=4, Tail= 13′, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 May  18.88 UT: m1=8.1:, Dia.=5′, DC=3, ...  20-cm L F/6 (37x) ...  Marian Legutko (Gliwice, Poland) [light pollution, good transparency, ...  no tail visible, ...  Sidgwick method]
2017 May  18.84 UT: m1=8.4, Dia.=6.2′, DC=3/, Tail= 3′ in PA: 310 deg., ...  25-cm L (42x, 70x) ...  Danil Sidorko (Korenovsk, Russia)
2017 May  17.88 UT: m1=9.6 CCD, Dia.=3.5′, DC=7/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  17.85 UT: m1=8.3, Dia.=6.5′, DC=4/, ...  11-cm B (20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  17.83 UT: m1=8.3, Dia.=7′, DC=6, ...  23.5-cm T (65x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 May  16.95 UT: m1=7.9 DSLR, Dia.=16′, ...  3.4-cm A + DSLR V f/4 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland) [tail: 0.66 deg in p.a. 314 deg]
2017 May  15.86 UT: m1=8.3, Dia.=4.5′, DC=4/, ...  11-cm B(20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  14.89 UT: m1=8.2, Dia.=4′, DC=4/, ...  11-cm B(20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  14.82 UT: m1=8.1, Dia.=5′, DC=5, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 May  13.93 UT: m1=9.7 CCD, Dia.=3.06′, DC=7/, Tail= 18′ in PA: 311 deg., ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  13.87 UT: m1=8.9:, Dia.=3′, DC=2, ...  20-cm L f/6 (49x) ...  Marian Legutko (Gliwice, Poland) [bright sky, moderate transparency, ...  no tail visible, ...  Sidgwick method]
2017 May  12.87 UT: m1=9.7 CCD, Dia.=2.80′, DC=7, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  12.85 UT: m1=8.5, Dia.=4′, DC=3/, ...  11-cm B(20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  11.87 UT: m1=9.5 CCD, Dia.=2.63′, DC=6/, Tail= 10′ in PA: 299 deg., ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  09.91 UT: m1=10.1 CCD, Dia.=1.75′, DC=6/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  06.72 UT: m1=8.4, Dia.=4.6’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Dust tail visible 15’ in length in P.A. 297° approximately. Low altitude = 7.6°. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 May  06.20 UT: m1=8.9, Dia.=6′, DC=4, Tail= 12′, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 May  04.89 UT: m1=8.3, Dia.=4.6′, DC=4, ...  11-cm B(20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  04.85 UT: m1=9.5 CCD, Dia.=3.00′, DC=6/, Tail= 9.5′ in PA: 306 deg., ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  04.76 UT: m1=8.1, Dia.=6.5′, DC=5, ...  10×70 R ...  Seiichi Yoshida (Gunma, Japan)
2017 May  04.72 UT: m1=8.6, Dia.=7.5′, DC=6, ...  40.0-cm L f/4.5 (36x) ...  Seiichi Yoshida (Gunma, Japan)
2017 May  03.82 UT: m1=8.8, Dia.=5′, DC=4, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 May  03.81 UT: m1=9.9 CCD, Dia.=2.62′, DC=6/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  03.12 UT: m1=8.8, Dia.=7′, DC=4/, Tail= 0.2 deg. in PA: 300 deg., ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [In 10×50 binoculars: m=7.7 for the coma + brighter inner dust tail. Sidgwick method. Tycho-2 comparison stars. SQM: 21.7 at zenith]
2017 May  02.89 UT: m1=8.0, Dia.=7′, DC=4, ...  10-cm B(25x) ...  Martin Lehky (Czech Republic)
2017 May  02.87 UT: m1=10.2 CCD, Dia.=2.48′, DC=6/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  02.83 UT: m1=8.5, Dia.=4.7′, DC=4, ...  11-cm B(20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  01.91 UT: m1=9.4, Dia.=5′, DC=3, ...  30.5-cm L (47x) ...  J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain) [new method visual adapted Navarro-Beyer]
2017 May  01.91 UT: m1=9.7, Dia.=4′, DC=3, ...  25.4-cm L (48x) ...  A. M. Hernandez (Puerto de la Cadena, Murcia, Spain) [new method visual adapted Navarro-Beyer]
2017 May  01.90 UT: m1=9.3:, Dia.=2′, DC=2, ...  20-cm L f/6 (68x) ...  Marian Legutko (Gliwice, Poland) [bright sky, poor transparency, ...  no tail visible, ...  Sidgwick method]
2017 Apr. 30.90 UT: m1=8.2, Dia.=7′, DC=4, ...  25×100 B ...  Martin Lehky (Czech Republic) [Morris Method]
2017 Apr. 30.25 UT: m1=8.8, Dia.=5′, DC=4, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Apr. 29.85 UT: m1=8.4, Dia.=6.5′, DC=4, ...  20×88 B ...  Maik Meyer (Limburg, Germany)
2017 Apr. 28.83 UT: m1=8.4, Dia.=6′, DC=3/, ...  13-cm L (52x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Apr. 28.72 UT: m1=8.8, Dia.=3.8’, DC=6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible 17.3’ in length in P.A. 304° approximately, ...  Inner coma fan shaped to the West, central condensation offset to the Eastern edge of the coma. Enhances in Swan Band filter. Low altitude = 10.1°. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Apr. 28.12 UT: m1=9.2, Dia.=4′, DC=5, Tail= 0.2 deg. in PA: 300 deg., ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [In 10×50 binoculars: m=7.7 for the coma + brighter inner dust tail. Sidgwick method. Tycho-2 comparison stars. SQM: 21.6 at zenith]
2017 Apr. 26.901 UT: m1=8.9, Dia.=6′, DC=5, ...  20×80 B ...  Neil Norman (FRAS, Ipswich, England)
2017 Apr. 24.83 UT: m1=8.4, Dia.=7′, DC=3, ...  20×100 B ...  Martin Lehky (Czech Republic) [Morris Method]
2017 Apr. 22.91 UT: m1=9.2, Dia.=5′, DC=3, ...  30.5-cm L (97x) ...  J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain)
2017 Apr. 22.83 UT: m1=8.9, Dia.=5′, DC=4, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Apr. 22.25 UT: m1=8.8, Dia.=4′, DC=4, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Apr. 21.14 UT: m1=9.2, Dia.=4′, DC=5, Tail= 0.2 deg. in PA: 300 deg. ...  20-cm SCT (77x), ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4 at zenith]
2017 Apr. 20.91 UT: m1=8.7, Dia.=4′, DC=4, Tail=10′, ...  10.2-cm R (20x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 19.92 UT: m1=10.9 CCD, Dia.=0.96′,DC=6/, ...  0.25-m f/4.7 reflector + CCD ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Apr. 19.87 UT: m1=8.3, Dia.=8′, DC=3/, ...  20×88 B ...  Maik Meyer (Limburg, Germany)
2017 Apr. 19.85 UT: m1=8.9, Dia.=4′, DC=3/, ...  11-cm B(20x) ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Apr. 19.85 UT: m1=9.1, Dia.=5′, DC=4/, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia) [S – Sidgwick`s method]
2017 Apr. 18.88 UT: m1=8.7, Dia.=9′, DC=3/, ...  20×88 B ...  Maik Meyer (Limburg, Germany)
2017 Apr. 17.87 UT: m1=9.3 CCD, Dia.=0.92, DC=6/, ...  0.25-m f/4.7 reflector + CCD ...  Serguey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Apr. 17.78 UT: m1=9.0, Dia.=3.5′, DC=5, ...  13-cm L (65x) ...  Alexsandr Morozov (Novozybkov, Russia) [S – Sidgwick`s method]
2017 Apr. 16.77 UT: m1=9.3, Dia.=3.2′, DC=4, Tail= 2.5′ in PA: 310 deg., ...  25-cm L (42x, 70x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Apr. 14.91 UT: m1=9.0, Dia.=4′, DC=4, Tail=9′, ...  10.2-cm R (20x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 13.89 UT: m1=9.4, Dia.=4.5′, DC=3, ...  26×88 B ...  Maik Meyer (Limburg, Germany)
2017 Apr. 07.16 UT: m1=9.2, Dia.=4′, DC=4/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. Some moonlight interference. SQM: 21.0 at zenith]
2017 Apr. 05.73 UT: m1=9.6, Dia.=4’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma enhances slightly in Swan Band filter, faint tail visible and traced to 9.6’ in P.A. 298° approximately. Low altitude= 11.4°. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Apr. 05.10 UT: m1=9.3, Dia.=3.5′, DC=4/, ...  15.2-cm R (38x) ...  Maik Meyer (Limburg, Germany)
2017 Apr. 05.03 UT: m1=9.1, Dia.=4′, ...  13-cm L (65x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Apr. 04.90 UT: m1=10.9 CCD, Dia.=1.55′, DC=6/, ...  0.25-m f/4.7 reflector + CCD ...  Serguey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Apr. 04.12 UT: m1=9.4, Dia.=4′, DC=4, Tail= 0.2 deg. in PA: 310 deg. ...  20-cm SCT (77x), ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM : 21.7 at zenith]
2017 Apr. 03.72 UT: m1=9.7, Dia.=3.8’, DC=5, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma enhances in Swan Band filter, faint dust tail visible 14’ in length in P.A. 318° approximately, ...  Low altitude= 11.4°. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Apr. 02.09 UT: m1=8.9, Dia.=6′, DC=4, Tail= 0.15 deg. in PA: 290 deg. ...  20×80 B, ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.)
2017 Apr. 01.948 UT: m1=9.3, Dia.=3′, DC=4, ...  20×80 B ...  Neil Norman (FRAS, Ipswich, England)
2017 Apr. 01.81 UT: m1=9.9, Dia.=4′, DC=3, ...  20-cm f/4 L (45x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 31.84 UT: m1=9.4, Dia.=2′, DC=3/, Tail= 3′ in PA: 305 deg., ...  25-cm L (42x, 70x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 31.81 UT: m1=9.8, Dia.=3.5′, DC=4/, ...  20-cm f/4 L (45x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 29.84 UT: m1=9.5, Dia.=2′, DC=3/, Tail= 2.5′ in PA: 300 deg., ...  25-cm L (42x & 70x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 29.31 UT: m1=9.3, Dia.=4′, DC=4, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [enhanced image with Swan band filter]
2017 Mar. 29.10 UT: m1=9.4 CCD, Dia.=2.4′, Tail (dust)= 0.13 deg in p.a. 315 deg. ...  15-cm L + CCD + Rc filter, f/4, ...  Mieczyslaw Leszek Paradowski (Lublin, Poland)
2017 Mar. 29.08 UT: m1=9.1 CCD, Dia.=8.6′, ...  15-cm L + CCD + V filter, f/4 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland)
2017 Mar. 28.89 UT: m1=9.1, Dia.=5.0′, DC=4, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.)
2017 Mar. 28.84 UT: m1=8.9, Dia.=8′, DC=4, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Mar. 28.82 UT: m1=8.6, Dia.=11′, DC=2/, ...  6-cm B (20x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Mar. 28.15 UT: m1=9.8, Dia.=4′, DC=4, Tail= 8′, ...  20-cm SCT(50x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 28.15 UT: m1=9.4, Dia.=6′, DC=3/, Tail= 0.2 deg. in PA: 310 deg., ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Collado del Fresno, Asturias, Spain, ...  Alt. 1280 m, 43º 10′ N, 5º  54′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5 at zenith. Dust tail 0.2-deg in p.a. 310 deg.]
2017 Mar. 27.86 UT: m1=9.5, Dia.=4.5′, DC=3/, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.)
2017 Mar. 27.70 UT: m1=9.7, Dia.=3.9’, DC=4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, 16’ in length in P.A. 307° approximately, ...  Coma dims slightly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Mar. 27.06 UT: m1=9.2, Dia.=2.5′, DC=5, ...  60-cm L (78x) ...  Sandor Szabo (Hungary) [Tail is 15′ long to PA= 300-320 deg.]
2017 Mar. 26.93 UT: m1=9.2, Dia.=4.3′, DC=4, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.) [Impression of seeing a hint of tail.]
2017 Mar. 25.95 UT: m1=11.0, Dia.=2′, DC=3, ...  30.5-cm L (97x) ...  J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain)
2017 Mar. 25.92 UT: m1=9.6, Dia.=5′, DC=4, ...  15.2-cm R f:5 (38x) ...  Mail Mayer (Limburg, Germany)
2017 Mar. 24.94 UT: m1=8.5, Dia.=5′, DC=4, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia) (Lm=6.2)
2017 Mar. 23.83 UT: m1=11.7 CCD, Dia.=1.5′, DC=4, Tail= 6.5′ in PA: 300 deg. ...  20-cm L + CCD, ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 23.82 UT: m1=9.8, Dia.=4′, DC=4/, ...  25-cm (150x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 22.57 UT: m1=9.5, Dia.=5.5′, DC=5, ...  40.0-cm L f/4.5 (36x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Mar. 20.89 UT: m1=9.3, Dia.=3′, DC=3, ...  13-cm L (52x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Mar. 20.04 UT: m1=9.7, Dia.=5′, DC=3/, Tail= 0.2 deg. in PA: 320 deg., ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.7 at zenith. Dust 0.2-deg in PA 320 deg]
2017 Mar. 20.03 UT: m1=10.1, Dia.=3′, DC=5, no tail, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 18.98 UT: m1=10.4, Dia.=4′, DC=3, ...  25-cm L (104x) ...  Valentín Díaz (La Romaneta, Alicante, España)
2017 Mar. 16.95 UT: m1=11.4 CCD, Dia.=1.13′, DC=6/, Tail= 9.5′ in PA: 323 deg. ...  0.25-m f/4.7 reflector + CCD, ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 13.87 UT: m1=11.7 CCD, Dia.=0.89′, DC=6/, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 10.11 UT: m1=9.7, Dia.=4′, DC=2/, ...  13-cm L (65x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Mar. 09.86 UT: m1=11.7 CCD, Dia.=0.88′, DC=6/, Tail= 3.5′ in PA: 321 deg. ...  0.25-m f/4.7 reflector + CCD, ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 06.98 UT: m1=10.0, Dia.=3.5′, DC=3/, ...  25-cm (150x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 06.96 UT: m1=10.6 CCD, Dia.=2.3′, DC=4, Tail= 3.5′ in PA: 300 deg., ...  20-cm L + CCD ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 06.74 UT: m1=10.3, Dia.=2.6’, DC=6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Inner coma enhances slightly in Swan Band filter, outer coma diffuse. Some interference by 11.6 mag star in coma, 1.4’ from the central condensation. Low altitude= 9.8°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Mar. 05.96 UT: m1=12.0 CCD, Dia.=1′, DC=4, Tail= 2.2′ in PA: 288 deg.,, ...  20-cm L + CCD ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 05.94 UT: m1=10.2, Dia.=2.8′, DC=4, ...  25-cm (150x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 04.99 UT: m1=11.8 CCD, Dia.=1.2′, DC=4/, Tail= 2.3′ in RA: 285 deg., ...  20-cm L ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 04.98 UT: m1=10.1, Dia.=3.25′, DC=4/, ...  25-cm L (150x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 04.05 UT: m1=11.7 CCD, Dia.=1.0′, DC=6/, Tail= 6′ in PA: 281 deg., ...  0.25-m f/4.7 L + CCD ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 02.02 UT: m1=10.5, m2=14.5, Dia.=2′, DC=s6, Tail= 3,5′ PA: 325 deg., ...  25.4-cm L (109x) ...  Gabor Santa (Göd, county Pest, Hungary) [nelm:6, 51 deg above horizon, SQM=19.5]
2017 Feb. 27.05 UT: m1=10.2, Dia.=2.5′, DC=5, ...  8-cm R (17x) ...  Piotr Guzik (Koskowa Góra, Poland, ...  Alt. 810 m, 49º 45′ N, 19º 47′ E) [Morris method used. SQM-L: 21.3 at zenith]
2017 Feb. 25.91 UT: m2=12.4 CCD, Dia.=0.59′, DC=6/, Tail= 5.3′ in PA: 326 deg., ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Feb. 25.00 UT: m2=12.4 CCD, Dia.=0.59′, DC=8, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Feb. 24.99 UT: m1=9.9, Dia.=4′, DC=3, ...  25×100 B ...  Juan Jose Gonzalez (La Vega de Robledo de Caldas, Leon, Spain, ...  Alt. 1110 m, 42º 55′ N, 5º 53′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5 at zenith. Mountain location, very clear sky]
2017 Feb. 24.99 UT: m1=10.3, Dia.=2′, DC=6, Tail= 0.15 deg. in PA:~300 deg., ...  33-cm L (67x) ...  Piotr Guzik (Teodorów, Poland, Alt. 287 m, 50º 27′ N, 20º 18′ E) [Morris method used. Broad dust tail realtively easy to see. Coma “grows” to ~4′ when viewed through SWAN band filter. Also visible in 10×50 binoculars at m1=9.7, Dia.=4′, DC=5. Excellent transparency. SQM: 21.3 at zenith.]
2017 Feb. 24.94 UT: m1=[10.3, NEGATIVE, Dia.=2.0′, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.) [Sometimes I had the impression that something really faint is visible in the predicted position, but I was not sure about it. Fainter than 10.3 mag.]
2017 Feb. 23.73 UT: m1=10.8, Dia.=3.3’, DC=4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) {Slight Moonlight interference, ...  Low altitude = 7.5°, ...  Enhances slightly in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Feb. 21.99 UT: m1=11.0, m2=13.9, Dia.=1.5′, DC=s6, Tail= 4′ PA: 310 deg., ...  25.4-cm L (133x) ...  Gabor Santa (Göd, county Pest, Hungary) [nelm:6, 41 deg above horizon]
2017 Feb. 19.02 UT: m1=10.6, Dia.=1.5′, DC=4, ...  25.4-cm L f:5 (64x) ...  Maik Meyer (Limburg, Germany)
2017 Feb. 18.03 UT: m1=10.7, Dia=2′, DC=4, no tail, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellón, España)
2017 Feb. 16.98 UT: m1=10.4, Dia.=3′, DC=3/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez ( Alto de la Camperona, Leon, Spain, ...  Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4 at zenith. Mountain location, very clear sky]
2017 Feb. 15.89 UT: m1=[10.1, NEGATIVE, Dia.=1.5′, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.) [Fainter than 10.1 mag.]
2017 Feb. 15.86 UT: m1=10.6, Dia.=1.5′, DC=5, ...  33-cm L (67x) ...  Piotr Guzik (Koskowa Góra, Poland, Alt. 800 m, 49º 45′ N, 19º 47′ E) [Morris method used. SQM: 21.1 at zenith]
2017 Feb. 14.91 UT: m1=11.8 CCD, Dia.=1.26′, DC=6/, Tail=7.5′ in PA: 275 deg, ...  0.25m f/4.7 reflector + CCD ...  Sergey Shurpakov (C36, Baran’, Belarus)
2017 Feb. 06.79 UT: m1=11.6, Dia.=2.5′, DC=6/, Tail= 4.5′ in PA: 310 deg, ...  40.0-cm L f/4.5 (75x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 29.93 UT: m1=11.6, Dia.=2.3′, DC=5, ...  35-cm L (62x) ...  Jakub Cerny (Senohraby, Czech Republic)
2017 Jan. 28.15 UT: m1=11.4, Dia.=1.5′, DC=5, Tail= 0.07 deg in PA: 315 deg., ...  33-cm L (67x) ...  Piotr Guzik (Koskowa Góra, Poland, ...  Alt. 800 m, 49º 45′ N, 19º 47′ E) [Morris method. APASS comparison stars. SQM: 20.9 at zenith.]
2017 Jan. 27.99 UT: m1=10.4, Dia.=2.7′, DC=3/, ...  20×100 B ...  Martin Lehky (Czech Republic)
2017 Jan. 27.99 UT: m1=10.9, Dia.=1.3′, DC=6, Tail= 0.08 deg. PA: 280 deg., ...  32.0-cm L (96x) ...  Uwe Pilz (Leipzig, Germany)
2017 Jan. 26.99 UT: m1=10.4, Dia.=2.8′, DC=3/, ...  20×100 B ...  Martin Lehky (Czech Republic)
2017 Jan. 25.97 UT: m1=12.4 CCD, Dia.=0.74′, DC=6/, Tail=9′ in PA 322 deg., ...  0.25-m f/4.7 reflector + CCD ...  Sergei Shurpakov (C36, Baran’, Belarus)
2017 Jan. 24.79 UT: m1=11.9, Dia.=1.7′, DC=6/, ...  40.0-cm L f/4.5 (75x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 24.20 UT: m1=10.6, Dia.=3′, DC=3/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, Alt. 1190 m, 43º 09′ N, 5º 54′ W ) [ Sidgwick method. Tycho-2 comparison stars. SQM: 21.5 at zenith. Mountain location, very clear sky]
2017 Jan. 19.01 UT: m1=12.4, Dia.=0.70′, DC=6/, Tail=5.4′ in PA 320 deg., ...  0.25-m f/4.7 reflector + CCD ...  Sergei Shurpakov (C36, Baran’, Belarus)
2017 Jan. 07.20 UT: m1=10.7, Dia.=3′, DC=3/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Alto del Castro, Leon, Spain, Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5 at zenith. Mountain location, very clear sky]
2017 Jan. 07.07 UT: m1=12.3 CCD, Dia.=0.88′, DC=6/, Tail=5′ in PA: 314 deg., ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Jan. 07.00 UT: m1=13.3 CCD, Dia.=0.6′, DC=2, Tail= 1′ in PA: 340 deg, ...  20-cm L+CCD ...  Danil Sidorko (Korenovsk, Russia)
2017 Jan. 06.19 UT: m1=11.3, dia.=1.3′, DC=4, ...  25.4-cm L f/5 (64x) ...  Maik Meyer (Limburg, Germany)
2017 Jan. 05.252 UT: m1=10.1, Dia.=1.5′, DC=2, ...  20×80 B ...  Neil Norman (Ipswich, England)
2017 Jan. 01.22 UT: m1=10.8, Dia.=3′, DC=3/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de las Señales, Leon, Spain, ...  Alt. 1610 m, 43º 05′ N, 5º 14′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.7 at zenith. Mountain location, very clear sky]

C/2015 V1 (PANSTARRS)
2017 Nov. 22.85 UT: m1=15.1, Dia.=0.6′, DC=3, ...  60-cm L (407x) ...  Sandor Szabo (Hungary)
2017 Nov. 14.88 UT: m1={15, NEGATIVE, Dia.=20″, ...  0.40-m L f/4.4 (360x) ...  Gabor Santa (Göd, Hungary) [comet was not seen, fainter than 15 magnitudes with 20″ diameter. 50 deg above horizon, nelm=5.0-5.2]
2017 Nov. 14.85 UT: m1=15.3, Dia.=0.3′, DC=5, ...  60-cm L (306x) ...  Sandor Szabo (Hungary)
2017 Nov. 09.47 UT: m1=14.2, Dia.=0.4’, DC=2/3, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 26.66 UT: m1=[14.4, ...  40.0-cm L f/4.5 (257x), ...  Seiichi Yoshida (Gunma, Japan)
2017 Sep. 13.86 UT: m1=16.0 CCD, Dia.=0.24′, DC=7, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 Aug. 26.81 UT: m1=15.6 CCD, Dia.=0.22′, DC=7, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 July 31.00 UT: m1=16.5 CCD, Dia.=0.17′, DC=8, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)

P/2015 TP200 (LINEAR)
2017 Feb. 14.75 UT: m1=17.0 CCD, Dia.=0.59′, DC=8, ...  0.25m f/4.7 reflector + CCD ...  Sergey Shurpakov (C36, Baran’, Belarus)
2017 Jan. 18.75 UT: m1=16.7, Dia.=0.37′, DC=7/, ...  0.25-m f/4.7 reflector + CCD ...  Sergei Shurpakov (C36, Baran’, Belarus)
2017 Jan. 07.86 UT: m1=16.3 CCD, Dia.=0.66′, DC=7/, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Jan. 06.91 UT: m1=16.1 CCD, Dia.=0.37′, DC=8, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)

C/2015 O1 (PANSTARRS)
2017 Sep. 22.79 UT: m1=14.2, Dia.=0.3’, DC=5, ...  60-cm reflector (244x) ...  Sandor Szabo (Sopron, Hungary)
2017 Aug. 21.86 UT: m1=14.0 DSRL, Dia.=0.89′, ...  5-cm A + DSLR V f/4 ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland)
2017 Aug. 21.85 UT: m1=14.3, Dia.=0.4′, DC=2/, ...  0.35-m L (351x) ...  Gabor Santa (Hungary) [Coma is next to a 14.5 mag star, but very obvious. Moving was detected in a half an hour period]
2017 Aug. 14.47 UT: m1=14.1, Dia.=0.4’, DC=3, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 10.38 UT: m1=14.3, Dia.=0.8’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very small and diffuse, visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 July 14.96 UT: m1=14.5, Dia.=0.2′, DC=7, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In-focus method. APASS comparison stars. SQM: 21.6]
2017 June 30.62 UT: m1=14.7, Dia.=0.2’, DC=5/6, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very small, just visible near mag 13.3 star. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 June 17.93 UT: m1=14.9 CCD, Dia.=0.26′, DC=8/, Tail=0.8′ in PA: 120 deg., ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  26.95 UT: m1=14.8 CCD, Dia.=0.35′, DC=8, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)

P/2015 F1 (PANSTARRS)
2017 Aug. 25.17 UT: m1=10.6, Dia.=3′, DC=2, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Puerto del Pando – Prioro, Leon, Spain, ...  Alt. 1430 m, 42º 56′ N, 4º 57′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2017 Jan. 30.71 UT: m1=12.0, Dia.=1’, DC=4, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma appears slightly elongated to the West approximately, transparent outer coma brightening to a moderately condensed and opaque centre. Does not enhance in Swan Band filter. Bright star of mag 7.8 (Tycho-2) 2.1’ away in P.A. 146°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Jan. 29.70 UT: m1=12.0, Dia.=1.1’, DC=3/, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse and transparent, brightening slightly to centre. Coma slightly elongated to the West approximately. Does not enhance in Swan Band filter. Close to mag 12.2 star 0.2’ away in P.A. 0.3°. At x166 the inner coma appears small and opaque. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]

C/2015 ER61 (PANSTARRS)
2017 Nov. 14.90 UT: m1=14.3, Dia.=0.6-0.7′, DC=0, ...  0.40-m L f/4.4 (360x) ...  Gabor Santa (Göd, Hungary) [comet was seen well, round, without condensation. 59 deg above horizon, nelm=5.5]
2017 Nov. 14.86 UT: m1=13.5, Dia.=0.9′, DC=2, ...  60-cm L (244x) ...  Sandor Szabo (Hungary)
2017 Oct. 27.97 UT: m1=13.3, Dia.=1,3′, DC=2-3, ...  0.40-m Dobsonian f/4.4 (200x) ...  Gabor Santa (Göd, Hungary) [Very diffuse]
2017 Sep. 25.70 UT: m1=14.2, Dia.=0.6′, DC=1, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Sep. 16.06 UT: m1=12.6, Dia=1′, DC=2, no tail, ...  20-cm SCT (120x) ...  Carlos Labordena (Castellón, España)
2017 Sep. 03.00 UT: m1=12.5, Dia.=1′, DC=2/, ...  25-cm L (150x) ...  Danil Sidorko (Korenovsk, Russia) [SQM = 21.65]
2017 Sep. 02.13 UT: m1=11.2, Dia=2′, DC=1, no tail, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellón, España)
2017 Sep. 01.07 UT: m1=10.8, Dia.=3′, DC=1/, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Alcuetas – Villabraz, Leon, Spain, ...  Alt. 885 m, 42º 16′ N, 5º 27′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Aug. 30.71 UT: m1=13.1, Dia.=1.1’, DC=2/3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Close to faint star. Coma diffuse, weak central condensation. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 21.08 UT: m1=10.5, Dia.=3′, DC=2, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Aug. 21.04 UT: m1=14.7 CCD, Dia.=0.27′, DC=7, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 Aug. 19.72 UT: m1=12.5, Dia.=1.5’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, on edge of Pleaides star cluster, close to star but distinguishable. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 19.00 UT: m1=12.1, Dia.=1′, DC=4, ...  0.60-m L (184x) ...  Gabor Santa (Hungary) [Coma is so diffuse and round]
2017 Aug. 17.69 UT: m1=12.1, Dia.=1.2’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. Comet on edge of Pleiades star cluster. Low altitude = 12.1°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 17.02 UT: m1=10.2, Dia.=3.5′, DC=2/: 20-cm SCT (77x) ...  (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Before moonrise. Altitude: 17 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2017 Aug. 15.02 UT: m1=14.1 CCD, Dia.=0.48′, DC=7/, Tail=7.7′ in PA=268 deg., ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 Aug. 12.77 UT: m1=10.7, Dia.=1.5′, DC=3/, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Gunma, Japan) [Fading. Hard to see in the moon light. Near by Pleiades]
2017 Aug. 10.02 UT: m1=14.5 CCD, Dia.=0.35′, DC=7, Tail=3.7′ in PA=282 deg. ...  25-cm reflector f/4.7, ...  Sergey Shurpakov (Baran’, Belarus)
2017 Aug. 02.06 UT: m1=11.6 CCD, Dia.=2.3′, ...  15-cm L + CCD + Rc filter f/4 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland) [tail: 0.23 deg in p.a. 268 deg, dawn]
2017 Aug. 02.05 UT: m1=11.6 CCD, Dia.=2.5′, ...  15-cm L + CCD + V filter f/4 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland) [tail: 0.26 deg in p.a. 265 deg]
2017 Aug. 01.75 UT: m1=11.6, Dia.=3.8’, DC=4, ...  25-cm L f:5 (39x) ...  (Chris Wyatt, Walcha, NSW, Australia) [Coma diffuse, brightening to centre, moderately condensed, does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 July 30.10 UT: m1=11.7, Dia=2.5′, DC=2, no tail, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellón, España)
2017 July 25.78 UT: m1=11.2, Dia.=3’, DC=3/4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma enhances slightly in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 July 24.77 UT: m1=11.2, Dia.=2.8’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma enhances in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 July 23.12 UT: m1=10.0, Dia.=3.5′, DC=3/, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2017 July 05.80 UT: m1=9.6, Dia.=5.6’, DC=6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, 20’ in length in P.A. 258°. Inner coma elongated and opaque. Small stellar central condensation. Fragment B not visible. Combined light observation. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 July 02.10 UT: m1=9.5, Dia.=4′, DC=4, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2017 June 30.75 UT: m1=9.7, Dia.=4.4’, DC=5, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 20’ in length in P.A. 253°. Inner coma elongated in tail direction. Combined light from fragment B in coma although fragment B not visible. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 June 27.04 UT: m1=[8.7, NEGATIVE, Dia.=5′, ...  20×80 B ...  Marek Biely (244 m.a.s.l., Brno, Czech Republic) [Still too low to be seen. Fainter than 8.7 mag.]
2017 June 24.33 UT: m1=8.9, Dia.=4′, DC=3/, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 24.10 UT: m1=8.5, Dia=3′, DC=3, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 June 22.76 UT: m1=9.3, Dia.=4.1’, DC=5, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, 10.5’ in length in P.A. 260°, ...  Coma dims slightly in Swan Band filter. Inner coma appears elongated to the South-West approximately, Fragment B just noticeable as a diffuse smudge behind the central condensation in the coma. Magnitude refers to total combined light of the pair. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 June 21.10 UT: m1=8.0, Dia.=4′, DC=4, ...  25×100 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Altitude: 14 deg. In 20 cm SCT(77x): m1=8.2, Dia.=3′, DC=4/, Tail: 0.2 deg. in PA 260 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2017 June 02.32 UT: m1=8.5:, ...  10-cm R (34x) ...  Willian Souza (Sao Paulo, Brazil)
2017 May  26.32 UT: m1=8.0, Dia.=5′, DC=5, ...  8-cm R (26x) ...  Willian Souza (Sao Paulo, Brazil)
2017 May  24.12 UT: m1=7.9, Dia.=4′, DC=5, ...  25×100 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [In 20 cm SCT(77x): tail 0.4-deg in PA 260 deg. Beginning of astronomical twilight. Sidgwick method. Tycho-2 comparison stars. Altitude: 9 deg. SQM: 20.8. Mountain  location, very clear sky]
2017 May  14.05 UT: m1=7.9 DSRL, Dia.=3.2′, ...  3.4-cm A + DSLR V f/4 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland) [tail: 0.22 deg, twilight, comet alt. 7.3 deg]
2017 May  08.30 UT: m1=7.7, Dia.=5′, DC=5, ...  15×70 B ...  Willian Souza (Sao Paulo, Brazil)
2017 May  07.76 UT: m1=7.9, Dia.=6.0′, Tail= 0.2 degrees PA= 255 deg., ...  25×100 B ...  David A. J. Seargent (Cowra, NSW, Australia) [Marginally enhanced using Swan Band filter]
2017 May  07.35 UT: m1=7.6, Dia.=6′, DC=4/, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Haze]
2017 May  06.77 UT: m1=7.8, Dia.=8.5’, DC=6, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Star-like central condensation surrounded by a diffuse haze, appears clircular. Strongly enhances in Swan Band filter. Slight interference from zodiacal light and glare from Venus. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 May  06.21 UT: m1=7.9, Dia.=4′, DC=5, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 May  04.75 UT: m1=7.8, Dia.=5′, DC=5, ...  40.0-cm L f/4.5 (36x) ...  Seiichi Yoshida (Gunma, Japan)
2017 May  03.15 UT: m1=7.5, Dia.=5′, DC=5, ...  25×100 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [In 20 cm SCT(77x): tail 0.6-deg in PA: 250 deg. Beginning of astronomical twilight. Sidgwick method. Tycho-2 comparison stars. Altitude: 9 deg. SQM: 21.5 at zenith. Mountain  location, very clear sky]
2017 Apr. 30.31 UT: m1=7.4, Dia.=6′, DC=5, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Apr. 28.77 UT: m1=7.8, Dia.=8.2’, DC=6, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, stellar centre enhances strongly in Swan Band filter. Tail visible, in 10”f/5 dob at x39, and traced to 23.5’ in length in P.A. 253°. Slight interference by zodiacal light. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Apr. 28.16 UT: m1=7.4, Dia.=5′, DC=5, ...  10×50 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W)  [In 20 cm SCT(77x): tail 0.5-deg in PA: 250 deg. Beginning of astronomical twilight. Sidgwick method. Tycho-2 comparison stars. Altitude: 10 deg. SQM: 21.4 at zenith. Mountain  location, very clear sky]
2017 Apr. 26.33 UT: m=7.6, Dia.=6′, DC=5, ...  15×70 B ...  Willian Souza (Sao Paulo, Brazil)
2017 Apr. 25.09 UT: m1=7.7, Dia.=8′, DC=3, ...  25×100 B ...  Martin Lehky (Czech Republic) [Morris Method]
2017 Apr. 24.17 UT: m1=7.4, Dia=4′, DC=5, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 22.29 UT: m1=7.5, Dia.= 5′, DC=4, ...  9.0-cm-R f/5.5 (33x) ...  Willian Souza (Sao Paulo, Brazil)
2017 Apr. 22.29 UT: m1=7.4, Dia.=4′, DC=5, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight / clouds]
2017 Apr. 21.17 UT: m1=7.0, Dia.=5′, DC=5, ...  25×100 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Astronomical twilight. Moonlight interference. Sidgwick method. Tycho-2 comparison stars. Altitude: 12 deg. SQM: 21.0 at zenith. Mountain  location, very clear sky]
2017 Apr. 19.34 UT: m=7.1, Dia.=8′, DC=4, ...  15×70 B ...  Willian Souza (Sao Paulo, Brazil)
2017 Apr. 16.27 UT: m1=6.9, Dia.=7′, DC=4/, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight / clouds]
2017 Apr. 15.25 UT: m1=6.7, Dia.= 8′, DC=4, ...  7×50 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight / comet altitude: 11º]
2017 Apr. 10.34 UT: m1=6.5, Dia.=12′, DC=4/, ...  7×50 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight / clouds]
2017 Abr. 08.36 UT: m1=6.2, Dia.=12´, DC=6/, ...  25-cm f/4.5 L (66X) ...  Gonzalo Vargas (Cochabamba, Bolivia) [Cola= 0.22 grados PA: 264 grados, ...  con 66 aumentos y un filtro SkyGlow pude apreciar la fina cola que es más brillante cerca del borde de la coma del cometa]
2017 Apr. 08.19 UT: m1=6.5, Dia.=25′, DC=3, ...  20×80 B ...  J. P. Navarro Pina / Manuel Hernandez (Puerto Cadena, Murcia, Spain) [Comet very condensed and bright , altitude 400 mts]
2017 Apr. 07.18 UT: m1=7.1, Dia.=4′, DC=6, no tail, ...  8-cm B(11x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 07.18 UT: m1=6.2, Dia.=8′, DC=5/, ...  10×50 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [In evolution after the recent outburst. The comet shows a wider coma diameter and brighter m1 estimate in comparison with my previous Apr. 4.17 observation. Sidgwick method. Tycho-2 comparison stars. Altitude: 12 deg. SQM: 21.4 at zenith. Mountain  location, very clear sky]
2017 Apr. 05.80 UT: m1=6.2, Dia.=8’, DC=5, ...  8×40 B ...  Michael Mattiazzo (Swan Hill, Vic, Australia) [Clearly in outburst, 2 orders of magnitude brighter than 48 hours ago. Through 25x100mm binoculars, coma appears evenly bright and an ion tail at least 30’ long in PA 255 has developed]
2017 Apr. 05.74 UT: m1=6.4, Dia.=7.3’, DC=6/7, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [In outburst, ...  Inner coma bright and aqua-blue in colour, enhances strongly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Apr. 05.35 UT: m1=6.2, Dia.=7′, DC=6/, Tail= 0.7º PA: 255 deg., ...  7×50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Apr. 05.34 UT: m1=6.4, Dia.=6′, DC=7, Tail= 0.7º PA: 255 deg., ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Abr. 05.33 UT: m1=6.4, Dia.=10´, DC=6, ...  25-cm f/4.5 L (66x) ...  Gonzalo Vargas (Cochabamba, Bolivia) [Cola=0.3 grados en PA: 262 grados, ...  con 132 aumentos pude apreciar cierto tipo de filamentos saliendo de la parte central en forma de abanico]
2017 Apr. 04.17 UT: m1=7.4, Dia.=4′, DC=6, ...  10×50 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Possible outburst. The comet shows a higher DC, appearing significantly brighter than expected in comparison with my previous Apr. 1.18 observation. Sidgwick method. Tycho-2 comparison stars. SQM: 21.5 at zenith. Altitude: 9 deg. In 20 cm SCT(77x): m2=10.5: (Tycho-2). Dust tail 0.2-deg in PA 260 deg.  Mountain  location, very clear sky]
2017 Apr. 03.80 UT: m1=8.3, Dia.=5’, DC=4, ...  25×100 B ...  Michael Mattiazzo (Swan Hill, Vic, Australia) [short dust tail 10’ in PA 255]
2017 Apr. 03.73 UT: m1=8.6, Dia.=4’, DC=6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Faint tail traced to 29’ in length in P.A. 253° approximately, ...  coma centre stellar and aqua-blue in colour. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Apr. 02.28 UT: m1=8.4, Dia.=6′, DC=5, Tail= 0.3º PA: 260 deg., ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Apr. 02.18 UT: m1=8.8, Dia.=3.5′, DC=4, no tail, ...  20-cm SCT(50x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 02.10 UT: m1=[7.0, NEGATIVE, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.) [Impossible to see in these altitudes. Fainter than 7.0 mag.]
2017 Apr. 01.85 UT: m1=8.3, Dia.=6′, DC=5, ...  10-cm f/4 L (20x) ...  Andrew Pearce (Bailup, W. Australia) [tail observed in 20cm L, 16′ long in PA 258 deg.  Comet seems to have faded a reasonable amount in 24 hrs, sky conditions the same between both mornings]
2017 Apr. 01.71 UT: m1=8.1, Dia.=6.8’, DC=4, ...  11×70 B ...  Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, moderately condensed centre, enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Apr. 01.18 UT: m1=8.2, Dia.=6′, DC=3, ...  25×100 B ...  Juan Jose Gonzalez (Candanedo de Fenar, Leon, Spain, ...  Alt. 1060 m, 42º 49′ N, 5º 34′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4 at zenith. Altitude: 10 deg. Mountain location, very clear sky]
2017 Mar. 31.84 UT: m1=7.6 Dia.=10′, DC=4, ...  10-cm f/4 L (20x) ...  Andrew Pearce (Bailup, W. Australia) [tail observed in 20cm L, 35′ long in PA 263 deg.]
2017 Mar. 30.33 UT: m1=8.5, Dia.=6′, DC=5, Tail= 0.3º PA: 260 deg., ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Mar. 29.33 UT: m1=8.5, Dia.=6′, DC=5, Tail= 0.3º PA: 260 deg., ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Mar. 28.19 UT: m1=8.7, Dia.=4′, DC=3, ...  25×100 B ...  Juan Jose Gonzalez (Collado del Fresno, Asturias, Spain, ...  Alt. 1280 m, 43º 10′ N, 5º  54′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5 at zenith. Altitude: 12 deg. In 20 cm SCT(77x): Dust tail 0.2-deg in p.a. 260 deg. Mountain location, very clear sky]
2017 Mar. 28.17 UT: m1=9.0, Dia.=3′, DC=4, no tail, ...  20-cm SCT(50x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 27.71 UT: m1=9.0, Dia.=3.6’, DC=5, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, approximately 16.5’ in length in P.A. 259°. Coma enhances in Swan Band filter. Inner coma opaque. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Mar. 25.78 UT: m1=8.6, Dia.=5’, DC=4, ...  25×100 B ...  Michael Mattiazzo (Swan Hill, Vic, Australia)
2017 Mar. 25.33 UT: m1=9.5, Dia.=5′, DC=4/, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [enhanced image with Swan band filter]
2017 Mar. 24.84 UT: m1=8.9 Dia.=5.5′, DC=4, ...  10-cm f/4 L (20x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 09.23 UT: m1=9.1, Dia.=5′, DC=2, ...  25×100 B ...  Juan Jose Gonzalez (Cea, Leon, Spain, Alt. 880 m, 42º 28′ N, 5º  0′ W) [Sidgwick method. Tycho-2 comparison stars. Altitude: 16 deg. Astronomical twilight. Rural dark sky location, clear sky. Mar. 9.22 : In 20 cm SCT (77x) : m1=9.3, elongated coma. SQM: 21.3 at zenith]
2017 Mar. 08.68 UT: m1=10.4, Dia.=2.3’, DC=4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, approximately 5’ in length in P.A. 272°. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Mar. 06.69 UT: m1=10.0, Dia.=2.8’, DC=4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Short faint tail visible, 5.4’ in length in P.A. 235°, ...  transparent coma enhances in Swan Band filter. Slight interference by star in coma, approximately 1’ from the central condensation. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Mar. 03.80 UT: m1=10.7, Dia.=1.1′, DC=3/, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Feb. 28.31 UT: m1=11.3, Dia.=1′, DC=3, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Feb. 23.67 UT: m1=10.9, Dia.=3’, DC=4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, 3.6’ in length in P.A. 286° approximately. Coma enhances well in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Feb. 21.21 UT: m1=9.5, Dia.=4′, DC=2, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain, ...  Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Sidgwick method. Tycho-2 comparison stars. Very faint and diffuse outer coma. Altitude: 14 deg. Field stars checked in DSS. Some moonlight interference. Mountain location, very clear sky]
2017 Feb. 20.67 UT: m1=11.0, Dia.=1.4’, DC=2/3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Moonlight, ...  Enhances slightly in Swan Band filter, opaque centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Feb. 17.68 UT: m1=11.0, Dia.=1.4’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Slightly enhances in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Feb. 06.81 UT: m1=11.4, Dia.=1.2′, DC=3, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Feb. 01.71 UT: m1=11.2, Dia.=2.5’, DC=5/, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Outer coma very diffuse, brightening to a moderately condensed inner coma with a sometimes stellar central condensation. Coma slightly elongated to the West. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Jan. 31.70 UT: m1=11.5, Dia.=1.2’, DC=5, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, elongated to West approximately. Gradual brightening to a small and opaque but moderately condensed centre, faintly stellar in good seeing. [Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Jan. 28.18 UT: m1=11.4, Dia.=2′, DC=3, ...  33-cm L (67x) ...  Piotr Guzik (Koskowa Góra, Poland, ...  Alt. 800 m, 49º 45′ N, 19º 47′ E) [Sidgwick method. APASS comparison stars. Low altitude: ~12 deg. Exceptional transparency, limiting stellar magnitude in comets vicinity ~15.0 mag. SQM: 20.9 at zenith]
2017 Jan. 24.83 UT: m1=12.2, Dia.=1.1′, DC=3/, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 24.22 UT: m1=9.3, Dia.=6′, DC=1, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, ...  Alt. 1190 m, 43º 09′ N, 5º 54′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5 at zenith. Very faint and diffuse outer coma. Altitude: 13 deg. Field stars checked in DSS. Several stars in coma, the brightest being mag 12.5 (GSC). Mountain location, very clear sky]
2017 Jan. 23.69 UT: m1=12.5, Dia.=1’, ...  DC=2/, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Moonlight, ...  Coma diffuse, slight brightening to centre. No enhancement in Swan Band filter. Motion detected after 15 mins. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Jan. 07.21 UT: m1=10.1, Dia.=4.5′, DC=1/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Alto del Castro, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5 at zenith. Very faint and diffuse outer coma. Altitude: 11 deg. Zodiacal light. Field stars checked in DSS. Mountain location, very clear sky]
2017 Jan. 01.25 UT: m1=10.2, Dia.=4.5′, DC=1/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de las Señales, Leon, Spain, ...  Alt. 1610 m, 43º 05′ N, 5º 14′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.7 at zenith. Very faint and diffuse outer coma. Altitude: 17 deg. Zodiacal light. Field stars checked in DSS. Mountain location, very clear sky]

C/2015 D3 (PANSTARRS)
2017 Jan. 25.94 UT: m1=18.6 CCD, Dia.=0.37′, DC=9, ...  0.25-m f/4.7 reflector + CCD ...  Sergei Shurpakov (C36, Baran’, Belarus)

C/2014 B1 (Schwartz)
2017 Mar. 28.88 UT: m1=15.6 CCD, Dia.=0.47′, ...  15-cm L + CCD + V filter, f/4 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland)
2017 Mar. 28.84 UT: m1=15.0 CCD, Dia.=0.47′, ...  15-cm L + CCD + Rc filter, f/4 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland)
2017 Mar. 26.87 UT: m1=15.7, Dia.=0.4′, DC=2, ...  60-cm L (306x) ...  Sandor Szabo (Hungary)

C/2011 KP36 (Spacewatch)
2017 Nov. 22.94 UT: m1=15.0, Dia.=0.5′, DC=3, ...  60-cm L (306x) ...  Sandor Szabo (Hungary)
2017 Aug. 19.03 UT: m1=15.4, Dia.=0.35′, DC=0, ...  0.60-m L (520x) ...  Gabor Santa (Hungary) [Checked on a photo taken on the same night and same location by Ákos Nagy Mélykuti]
2017 Jan. 25.69 UT: m1=15.6 CCD, Dia.=0.48′, DC=7/, Tail=0.82′ in PA 269 deg., ...  0.25-m f/4.7 reflector + CCD ...  Sergei Shurpakov (C36, Baran’, Belarus)

(3200) Phaethon
2017 Dec. 19.42 UT: m1=13.2, Dia.=-, DC=9, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Dec. 16.82 UT: m1=10.6, Dia.=0, DC=9, ...  12.7-cm MN (40x) ...  Valentín Díaz (La Murta, Murcia, España)
2017 Dec. 14.013 UT: m1:10.9, Dia.=0.0′, DC=9, ...  20-cm L (63x) ...  Valentín Díaz (Cancarix, Albacete, España)
2017 Dec. 13.57 UT: m1=10.7, Dia=–, DC=9, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 11.1°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= I, ...  Cat= AQ]
2017 Dec. 11.91 UT: m1=11.0, Dia.=–, DC=9, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Villacintor, Leon, Spain, ...  Alt. 930 m, 42º 29′ N, 5º 11′ W) [Stellar appearance. Motion obvious. In-focus method. Tycho-2 comparison stars. SQM: 21.2]
2017 Dec. 11.38 UT: m1=10.9, Dia.=-, DC=9, ...  40.0-cm L f/4.5 (75x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Dec. 06.79 UT: m1=12.4, Dia.=–, DC=9, ...  30.5-cm L (94x) ...  J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain)
2017 Dec. 05.80 UT: m1=12.4, Dia.= –, DC=9, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Candanedo de Fenar, Leon, Spain, ...  Alt. 1060 m, 42º 49′ N, 5º 34′ W) [Stellar appearance. Motion checked during a 10-min period, before moonrise. Field stars checked in DSS. In-focus method. APASS comparison stars. SQM: 20.3]
2017 Nov. 24.77 UT: m1=13.8, Dia.=-, DC=9, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Nov. 22.98 UT: m1=14.5, Dia.=0.0′, DC=9, ...  60-cm L (407x) ...  Sandor Szabo (Hungary)

355P/LINEAR-NEAT
2017 Dec. 13.77 UT: m1=16.7 CCD, Dia.=0.30′, DC=8, ...  0.25-m f/4.7 reflector + CCD ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Nov. 24.44 UT: m1=[14.0, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Nov. 22.83 UT: m1=14.8, Dia.=0.7′, DC=3, ...  60-cm L (306x) ...  Sandor Szabo (Hungary)

315P/LONEOS
2017 Mar. 28.04 UT: m1=14.2 CCD, Dia.=0.57′, ...  15-cm L + CCD + Rc filter, f/4 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland)
2017 Mar. 27.95 UT: m1=14.8 CCD, Dia.=0.57′, ...  15-cm L + CCD + V filter, f/4 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland)
2017 Mar. 27.52 UT: m1=14.5, Dia.=0.4’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very small, visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Mar. 26.93 UT: m1=14.6, Dia.=0.6′, DC=4, ...  60-cm L (244x) ...  Sandor Szabo (Hungary)
2017 Mar. 22.56 UT: m1=14.0, Dia.=0.5′, DC=2, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Mar. 16.89 UT: m1=15.7 CCD, Dia.=0.22′, DC=7/, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 15.83 UT: m1=12.3, Dia.=1.7′, DC=2/, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Alto del Trichero – Soto y Amío, Leon, Spain, Alt. 1190 m, 42º 46′ N, 5º 53′ W) [Sidgwick method. APASS comparison stars. Possible minor outburst. Very faint and diffuse outer coma. Near-stellar central condensation, m2=14.7 (APASS). Field stars checked in DSS. Limiting star magnitude near comet: 15.0 (APASS). Mountain location, very clear sky. SQM: 21.3 at zenith]
2017 Mar. 15.83 UT: m1=13.5, Dia.=0.9′, DC=6, ...  30.5-cm L f:4.9 (150x) ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain)
2017 Mar. 15.81 UT: m1=14.2, Dia.=0.4′, DC=6, ...  33-cm L (182x) ...  Piotr Guzik (Koskowa Góra, Poland, ...  Alt. 810 m, 49º 45′ N, 19º 47′ E) [Small and well condensed, at 67x almost stellar. SQM-L: 21.1 at zenith. Bobrovnikoff method used, APASS comparison stars]
2017 Mar. 03.75 UT: m1=[13.5, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 26.02 UT: m1=15.7 CCD, Dia.=0.37′, DC=8/, Tail=0.9′ in PA 274 deg., ...  0.25-m f/4.7 reflector + CCD ...  Sergei Shurpakov (C36, Baran’, Belarus)
2017 Jan. 24.85 UT: m1=14.0, Dia.=0.3′, DC=2, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 24.25 UT: m1=13.7, Dia.=0.3′, DC=6, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, ...  Alt. 1190 m, 43º 09′ N, 5º 54′ W) [Sidgwick method. APASS comparison stars. SQM: 21.5 at zenith. Field stars checked in DSS. Limiting star magnitude near comet: 15.3 (GSC). Mountain location, very clear sky]
2017 Jan. 07.04 UT: m1=15.8 CCD, Dia.=0.35′, DC=8, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)

240P/NEAT
2017 Nov. 08.46 UT: m1=14.2, Dia.=1.2’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. Cloud eventually ended observation. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 27.62 UT: m1=14.1, Dia.=0.7’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, slight brightening to centre, appears more condensed in good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 21.72 UT: m1=14.2, Dia.=0.7’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Difficult, visible in periods of good seeing. Diffuse coma. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 19.45 UT: m1=14.0, Dia.=1.1’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 15.46 UT: m1=14.0, Dia,=1’, ...  DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 01.74 UT: m1=14.0, Dia.=0.8’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]

217P/LINEAR
2017 Nov. 22.96 UT: m1=15.2, Dia.=0.4′, DC=4, ...  60-cm L (407x) ...  Sandor Szabo (Hungary)
2017 Oct. 28.03 UT: m1=14.0, Dia.=0.6-0.7′, DC=0-1, ...  0.40-m Dobsonian f/4.4 (200x) ...  Gabor Santa (Göd, Hungary) [Very diffuse]
2017 Sep. 25.74 UT: m1=[14.0, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Sep. 21.76 UT: m1=13.9, Dia.=0.8’, DC=3, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Visible in periods of good seeing, difficult, close to stars. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 03.004 UT: m1=13.4, Dia.=0.3′, DC=3, ...  25-cm L (266x) ...  Danil Sidorko (Korenovsk, Russia) [SQM = 21.65]
2017 Sep. 01.77 UT: m1=13.6, Dia.=0.9’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, close to stars. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 30.72 UT: m1=12.9, Dia.=1’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, low altitude= 15.1°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 21.12 UT: m1=12.2, Dia.=2′, DC=3, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM: 20.9]
2017 Aug. 19.74 UT: m1=12.8, Dia.=1’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre, low altitude = 18.6°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 19.06 UT: m1=12.5, Dia.=1′, DC=3, ...  0.60-m L (184x) ...  Gabor Santa (Hungary)
2017 Aug. 01.76 UT: m1=12.6, Dia.=1’, DC=6, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter, coma slightly elongated to NW approximately. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 July 25.79 UT: m1=12.2, Dia.=1.4’, DC=5/6, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre with a faintly stellar central condensation. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 July 24.78 UT: m1=12.1, Dia.=2.5’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma does not enhance in Swan Band filter, slight interference by zodiacal light. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 July 05.79 UT: m1=12.2, Dia.=2.2’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma does not enhance in Swan Band filter, central condensation sometimes stellar in good seeing, slight interference from zodiacal light and Venus glare. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 June 30.73 UT: m1=13.0, Dia.=0.7’, DC=4/5, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse with moderately condensed centre. Hint of a tail to the WSW. Low altitude = 16.9°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 June 22.75 UT: m1=13.3, Dia.=0.8’, DC=5/6, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque with small central condensation, almost stellar. Slightly elongated to the South-East approximately. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]

213P/Van Ness
2017 Sep. 25.48 UT: m1=[12.7, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Aug. 14.46 UT: m1=13.5, Dia.=0.8’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, difficult due to crowded field. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 July 05.76 UT: m1=13.5, Dia.=0.7’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 June 30.64 UT: m1=13.6, Dia.=0.4’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma small and diffuse. Slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]

174P/Echeclus
2017 Dec. 23.58 UT: m1=13.8, Dia.=1’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Dec. 19.86 UT: m1=13.2, Dia.=0.8′, DC=5, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM: 21.4. Post-outburst. Possible faint and diffuse outer coma. Field stars checked in DSS]
2017 Dec. 19.43 UT: m1=14.3, Dia.=0.7′, DC=0, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Dec. 13.59 UT: m1=14.0, Dia.=1’, DC=5/6, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, uniform brightness across coma with faint stellar centre visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Dec. 12.02 UT: m1=13.0:, Dia.=0.5′, DC=7, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Dec. 11.83 UT: m1=13.6, Dia.=0.3′, DC=8, ...  20-cm SCT (222x) ...  Juan Jose Gonzalez (Villacintor, Leon, Spain, ...  Alt. 930 m, 42º 29′ N, 5º 11′ W) [In outburst. Field stars checked in DSS. Morris method. APASS comparison stars. SQM: 21.3]
2017 Dec. 11.37 UT: m1=13.2, Dia.=0.5′, DC=7/, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Dec. 09.80 UT: m1=13.6, Dia.=0.1′, DC=8, ...  40-cm L (267x) ...  Sandor Szabo (Hungary)
2017 Dec. 09.10 UT: m1= 13.9, ...  41-cm L (70x) ...  Alan Hale (Cloudcroft, New Mexico, USA) [stellar appearance]

145P/Shoemaker-Levy 5
2017 Nov. 22.99 UT: m1=15.7, Dia.=0.2′, DC=1, ...  60-cm L (407x) ...  Sandor Szabo (Hungary)
2017 Nov. 14.91 UT: m1=16.0, Dia.=0.1′, DC=7, ...  60-cm L (407x) ...  Sandor Szabo (Hungary) [Motion was checked after 30 min., I returned to it]
2017 Aug. 19.05 UT: m1=16.0, Dia.=0.25′, DC=0, ...  0.60-m L (520x) ...  Gabor Santa (Hungary) [Seen twice in this night. Datas estimated at the second time. Motion was detected in a half an hour period. Checked on a photo taken on the same night and same location by Ákos Nagy Mélykuti]

144P/Kushida
2017 Jan. 24.82 UT: m1=13.9, Dia.=0.9′, DC=2/, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Ibaraki, Japan)

143P/Kowal-Mrkos
2017 Jan. 18.84 UT: m1=18.8, Dia.=0.30′, DC=8/, ...  0.25-m f/4.7 reflector + CCD ...  Sergei Shurpakov (C36, Baran’, Belarus)

96P/Machholz 1
2017 Oct. 28.00 UT: m1=2.0, Dia.=23′, ...  Mieczyslaw Leszek Paradowski (Poland) [measured from SOHO C3 images]
2017 Oct. 13.39 UT: m1=11.6, Dia.=1.0’, DC=3/4, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Low altitude = 5.6°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 12.38 UT: m1=11.5, Dia.=1.3’, DC=3/4, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 8.5°, ...  Slight twilight interference, does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]

93P/Lovas 1
2017 Mar. 26.79 UT: m1=14.9, Dia.=0.3′, DC=4, ...  60-cm L (306x) ...  Sandor Szabo (Hungary)
2017 Jan. 24.40 UT: m1=[13.5, Negative, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Ibaraki, Japan)

90P/Gehrels
2017 Dec. 13.81 UT: m1=17.1 CCD, Dia.=0.22′, DC=8, ...  0.25-m f/4.7 reflector + CCD ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)

74P/Smirnova-Chernykh
2017 Feb. 14.74 UT: m1=16.8, Dia.=0.33′, DC=8, ...  0.25m f/4.7 reflector + CCD ...  Sergey Shurpakov (C36, Baran’, Belarus)
2017 Jan. 18.72 UT: m1=16.1, Dia.=0.41′, DC=8, ...  0.25-m f/4.7 reflector + CCD ...  Sergei Shurpakov (C36, Baran’, Belarus)
2017 Jan. 06.88 UT: m1=16.5 CCD, Dia.=0.33′, DC=9, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)

73P-BT/Schwassmann-Wachmann 3 (Component BT)
2017 Mar. 06.73 UT: m1=12.2, Dia.=0.9’, DC=3/4, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible 2.4’ in length in P.A. 265°, ...  Inner coma appears elongated East-West. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Feb. 23.72 UT: m1=11.9, Dia.=1.1’, DC=3/4, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma elongated to the West approximately, ...  Inner coma opaque. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Feb. 21.23 UT: m1=9.8, Dia.=3.5′, DC=2, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain, ...  Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Sidgwick method. Tycho-2 comparison stars. The visually observed faint and wide halo-like common coma of 73P is surrounding the primary and the brighter secondary component BT (this secondary is evolving after the recent outburst recorded in CCD images). Both central condensations were not individually detected in the present observation due to faintness, small separation (near 0.5 arcmin), instrumental (20 cm SCT at 100x) and observing conditions : interference from the nearby Moon (phase 0.28) and low altitude (9 deg) at the start of astronomical twilight. Field stars checked in DSS. Background star of mag 12.3 (GSC) in coma. Mountain location, very clear sky]
2017 Feb. 17.72 UT: m1=10.8, Dia.=1’, DC=2/3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Coma small, diffuse and opaque. Slight brightening to centre, no enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]

73P/Schwassmann-Wachmann 3
2017 Apr. 05.76 UT: m1=12.3, Dia.=2.2’, DC=5, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Short tail visible 2’ in length in P.A. 260° approximately, ...  Zodiacal light interference. Altitude= 15.6°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Apr. 01.86 UT: m1=11.9, Dia.=1.2′, DC=3, ...  20-cm f/4 L (100x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 31.86 UT: m1=11.6, Dia.=2′, DC=3, ...  20-cm f/4 L (100x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 30.35 UT: m1=12.0, Dia.=1′, DC=4/, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilght]
2017 Mar. 27.75 UT: m1=11.9, Dia.=0.7’, DC=6, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Very faint short tail visible, 1.8’ in length in P.A. 267° approximately. Inner coma opaque with faint stellar central condensation. Zodiacal light interference and low altitude = 15.3°. *Total light combined from components 73P and 73P-bt. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Mar. 24.86 UT: m1=11.5, Dia.=1.5′, DC=3, ...  20-cm f/4 L (100x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 03.83 UT: m1=[10.5, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Feb. 06.84 UT: m1=[12.2, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 28.17 UT: m1=13.4, Dia.=0.6′, DC=4, ...  33-cm L (182x) ...  Piotr Guzik (Koskowa Góra, Poland, ...  Alt. 800 m, 49º 45′ N, 19º 47′ E) [Sidgwick method. APASS comparison stars. Comet faint but small and condensed. Limiting stellar magnitude in comets vicinity ~15.2 mag. Motion checked over 20 minutes. SQM: 20.9 at zenith]
2017 Jan. 24.84 UT: m1=13.7, Dia.=0.6′, DC=2, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 07.25 UT: m1=11.4, Dia.=2.5′, DC=2, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Alto del Castro, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM : 21.4 at zenith. Faint and diffuse outer coma. Zodiacal light. Field stars checked in DSS. Mountain location, very clear sky]

71P/Clark
2017 Nov. 09.48 UT: m1=14.3, Dia.=0.5’, DC=2, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 26.39 UT: m1=12.7, Dia.=0.6′, DC=2, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Oct. 19.45 UT: m1=13.1, Dia.=1.5’, DC=2/3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 12.40 UT: m1=13.0, Dia.=1.2’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, difficult to see. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 22.45 UT: m1=12.2, Dia.=1.9’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Busy star field, difficult. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 19.44 UT: m1=12.4, Dia.=1.6’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 15.42 UT: m1=12.5, Dia.=1.2’, DC=2/3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 23.43 UT: m1=12.7, Dia.=1’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Close to background stars, possibly just seeing central portions of the coma. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 23.04 UT: m1=11.1, Dia.=2′, DC=3/, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Aug. 19.44 UT: m1=11.8, Dia.=2.1’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan band filter, background star in coma. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 17.42 UT: m1=11.9, Dia.=2’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Weak central condensation, diffuse coma. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 14.44 UT: m1=12.0, Dia.=1.6’, DC=3/4, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight interference by background stars. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Aug. 12.86 UT: m1=11.4, Dia=1.5′, DC=3, no tail, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellón, España)
2017 Aug. 12.40 UT: m1=12.0, Dia.=1.6’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse and semi-transparent, weakly condensed centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 10.99 UT: m1=10.9, Dia.=2′, DC=3, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 July 26.08 UT: m1=10.6, Dia.=3′, DC=4, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 July 25.43 UT: m1=10.9, Dia.=3.2’, DC=3/4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, moderately condensed centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 July 22.93 UT: m1=9.9, Dia.=2.5′, DC=4/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Alto del Trichero – Soto y Amio, Leon, Spain, ...  Alt. 1190 m, 42º 46′ N, 5º 53′ W) [Altitude: 10 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2017 July 19.91 UT: m1=10.3, Dia=2′, DC=5, no tail, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellón, España)
2017 July 15.01 UT: m1= 10.5, Dia.=3′, DC=4/, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 July 14.94 UT: m1=9.8, Dia.=2.5′, DC=4/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 11 deg. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2017 July 02.04 UT: m1=10.1, Dia.=2.5′, DC=5, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 6 deg. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2017 June 30.61 UT: m1=10.3, Dia.=3.1’, DC=6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma almost disappears in Swan Band filter. Semi-transparent outer coma, gradually brightening to an opaque centre with a small stellar central condensation. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 June 28.08 UT: m1=10.3, Dia.=4′, DC=4/, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 23.94 UT: m1=11.3, Dia=2.5′, DC=4, no tail, ...  15-cm T (60x) ...  Carlos Labordena (Castellón, España)
2017 June 23.06 UT: m1=10.3, Dia.=4′, DC=4/, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 22.48 UT: m1=10.4, Dia.=3.1’, DC=5/, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Inner coma opaque, sometimes stellar at centre, outer coma fanned to the NW approximately. Centre enhances slightly in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 June 21.53 UT: m1=10.5, Dia.=2.6’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma opaque at centre, semi-transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 June 21.17 UT: m1= 10.3, Dia.=4′, DC=4, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 June 20.48 UT: m1=10.3, Dia.=3, ...  25.4-cm L (71x) ...  David A. J. Seargent (Cowra, NSW, Australia) [Not as readily visible using Swan Band filter]
2017 June 20.45 UT: m1=10.5, Dia.=2’, DC=4, ...  25-cm L f:5 (x39) ...  Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 June 14.97 UT: m1=10.4, Dia.=2.5′, DC=5, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 June 13.93 UT: m1=10.3, Dia=1.5′, DC=4, no tail, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellón, España)
2017 June 12.88 UT: m1=11.2, Dia.=3′, DC=2, ...  30.5-cm L f/4.9 (97x) ...  J. P. Navarro Pina (Cañadas de San Pedro, Murcia, Spain) [Sidgwick method. Lm=5.7, comet small and diffuse]
2017 May  30.14 UT: m1=10.9, Dia.=2′, DC=4/, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 May  27.97 UT: m1=11.5, Dia.=1.3′, ...  30-cm L f/5 ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland) [comet alt. 12 deg]
2017 May  27.96 UT: m1=11.0 DSLR, Dia.=2.9′, ...  3.4-cm A + DSLR V f/4 ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland) [comet alt. 12.4 deg]
2017 May  29.71 UT: m1=11.3, Dia.=1.7’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, 4.3’ in length in P.A. 289°, ...  Outer coma diffuse, brightening to an opaque centre, faintly stellar in periods of good seeing, whitish in colour. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 May  27.17 UT: m1=11.0, Dia.=1.5′, DC=5, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 May  26.51 UT: m1=11.1, Dia.=1’, DC=5/, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, bright central condensation, sometimes stellar. Coma appears larger at lower magnification. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 May  25.12 UT: m1=11.6, Dia.=1.5′, DC=5, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 May  24.43 UT: m1=12.5, Dia.=0.8’, DC=6, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter, ...  Outer coma opaque brightening to an opaque inner coma and stellar central condensation. Slight hint of coma elongation to the NW approximately. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 May  24.02 UT: m1=11.2, Dia.=2.2′, DC=3/, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 May  21.93 UT: m1=[11.0, NEGATIVE, ... 13-cm L (65x) ...  Alexsandr Morozov (Novozybkov, Russia) [Lm=6.19]
2017 May  20.02 UT: m1=12.1, Dia=1′, DC=5, no tail, ...  20-cm SCT (1380x) ...  Carlos Labordena (Castellón, España)
2017 May  18.99 UT: m1=12.2, Dia.=1.5, DC=5, ...  42-cm L f:5 (81x) ...  Martin Lehky (Czech Republic)
2017 May  18.96 UT: m1=12.1, Dia.=1.6′, DC=4, ...  25-cm L (150x) ...  Danil Sidorko (Korenovsk, Russia)
2017 May  06.75 UT: m1=12.4, Dia.=1.1’, DC=6, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Hint of tail extending West, no enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 May  06.29 UT: m1=12.0, Dia.=1.5′, DC=4, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 May  04.74 UT: m1=12.2, Dia.=1.2′, DC=6, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Apr. 28.76 UT: m1=12.7, Dia.=1.3’, DC=6, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Apr. 28.13 UT: m1=12.0, Dia.=0.9′, DC=4, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W  ) [Comparison stars taken from APASS photometry. Field stars checked in DSS. Sidgwick method. SQM: 21.6 at zenith. Mountain  location, very clear sky]

65P/Gunn
2017 Aug. 18.82 UT: m1=13.3:, Dia.=1′, DC=0, ...  0.60-m L (244x) ...  Gabor Santa (Hungary) [Comet is barely visible due to low altitude]
2017 June 30.61 UT: m1=14.1, Dia.=1’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 June 26.51 UT: m1=14.0, ...  Dia.=0.8’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 June 22.47 UT: m1=13.9, Dia.=0.8’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 May  27.96 UT: m1=14.0, Dia.=0.5′, ...  30-cm L f/5 ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland) [comet alt. 16.5 deg, ...  faintest star 15.6 mag in FOV near the comet]
2017 May  26.50 UT: m1=13.7, Dia.=0.9’, DC=1, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]

62P/Tsuchinshan 1
2017 Dec. 23.67 UT: m1=11.7, Dia.=2.9’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 16°. No enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Dec. 20.16 UT: m1=9.7, Dia.=6′, DC=2, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2017 Dec. 18.78 UT: m1=11.3, Dia.=2.7′, DC=2, ...  40.0-cm L f/4.5 (75x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Dec. 16.21 UT: m1=11.2, Dia.=3′, DC=2, no tail, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellón, España)
2017 Dec. 16.19 UT: m1=9.7, Dia.=6′, DC=2/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Villacintor, Leon, Spain, ...  Alt. 930 m, 42º 29′ N, 5º 11′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2017 Dec. 15.30 UT: m1=10.4, Dia.=4′, DC=3, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Dec. 14.68 UT: m1=11.0, Dia.=4.3’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 16.5°. Coma does not enhance in Swan Band filter, diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Nov. 26.20 UT: m1=9.8, Dia.=6′, DC=2/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Nov. 24.78 UT: m1=10.4, Dia.=4′, DC=1/, ...  40.0-cm L f/4.5 (75x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Nov. 24.70 UT: m1=10.9, Dia.=3.2´, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma enhances slightly in Swan Band filter. Low altitude = 15.1°, ...  Slightly foggy. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Nov. 16.16 UT: m1=9.2, Dia.=7′, DC=2/, ...  25×100 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Altitude: 30 deg. In 20 cm SCT (77x) : m1=9.6, Dia.=6′, DC=2. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2017 Nov. 15.16 UT: m1=11.2, Dia.=3′, DC=3, no tail, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellón, España)
2017 Nov. 14.12 UT: m1=9.6, Dia.=6′, DC=2/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1490 m, 42º 54′ N, 5º 48′ W) [Altitude: 21 deg. Before moonrise. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2017 Nov. 02.16 UT: m1=10.8, Dia.=2.5′, DC=2/, ...  25.4-cm L f:5 (64x) ...  Maik Meyer (Limburg, Germany)
2017 Nov. 01.13 UT: m1=10.5, Dia.=2.8′, DC=2, ...  0.15-m R f/5 (85x) ...  Gabor Santa (Göd, Hungary) [comet is easy to see, diffuse, round, with some condensation. 40 deg above horizon, nelm=5.5]
2017 Nov. 01.02 UT: m1=11.0, Dia.=2.2′, DC=3/, ...  25-cm L (150x) ...  Danil Sidorko (Korenovsk, Russia) [SQM = 20.42]
2017 Oct. 30.72 UT: m1=11.0, Dia.=3.2’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 16.6°, ...  Weakly condensed coma. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 30.18 UT, ...  m1=10.9, Dia.=3′, DC=2/, ...  25.4-cm L f:5 (64x) ...  Maik Meyer (Limburg, Germany)
2017 Oct. 26.77 UT: m1=11.5, Dia.=2.4′, DC=3, ...  40.0-cm L f/4.5 (75x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Oct. 23.22 UT: m1=10.2, Dia.=5′, DC=2, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Significantly brighter than expected. Altitude: 46 deg. Zodiacal light. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]

56P/Slaughter-Burnham
2017 Jan. 07.75 UT: m1=16.6 CCD, Dia.=0.49′, DC=7/, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)

47P/Ashbrook-Jackson
2017 Nov. 22.88 UT: m1=15.3, Dia.=0.25′, DC=5, ...  60-cm L (407x) ...  Sandor Szabo (Hungary)
2017 Nov. 14.83 UT: m1=15.2, Dia.=0.15′, DC=3, ...  60-cm L (306x) ...  Sandor Szabo (Hungary)

45P/Honda-Mrkos-Pajdusakova
2017 Apr. 04.83 UT: m1=18.4 CCD, Dia.=0.33′, DC=6/, ...  0.25-m f/4.7 reflector + CCD ...  Serguey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 22.61 UT: m1=13.6, Dia.=1.0′, DC=0, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Mar. 20.05 UT: m1=11.0, Dia.=3′, DC=1/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM: 21.7 at zenith. Very faint and diffuse elongated coma. Field stars checked in DSS. Mountain location, very clear sky]
2017 Mar. 16.82 UT: m1=15.1 CCD, Dia.=0.61′, DC=6/, Tail= 7′ in PA: 285 deg., ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 15.78 UT: m1=13.0:, Dia.=&2′, DC=2, ...  33-cm L (67x) ...  Piotr Guzik (Koskowa Góra, Poland, Alt. 810 m, 49º 45′ N, 19º 47′ E) [Faint and diffuse, magnitude uncertain because of close proximity of relatively bright star. SQM-L: 21.0 at zenith. Sidgwick method, APASS comparison stars]
2017 Mar. 14.86 UT: m1=10.5, Dia=5′, DC=2, no tail, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 13.73 UT: m1=16.0 CCD, Dia.=0.30′, DC=7, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 08.68 UT: m1=10.5, Dia.=5.5’, DC=2, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very large, transparent outer coma, diffuse but slightly brighter inner coma. Faint elongation to the SE approximately. Observation ended by cloud. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= S, ...  Cat= TK]
2017 Mar. 03.94 UT: m2=13.3 CCD, Dia.=1.5′, DC=6/, Tail= 7′ in PA: 276 deg., ...  0.25-m f/4.7 L + CCD ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 03.73 UT: m1=10.7, Dia.=6′, DC=0/, ...  40.0-cm L f/4.5 (36x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Mar. 02.14 UT: m1=8.2, Dia.=12′, DC=2, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Mar. 01.96 UT: m1=9.8, Dia.=7×20′, DC=0-1, ...  15.3-cm R (38x) & 25.4-cm L (60x) ...  Gabor Santa (Göd, county Pest, Hungary) [Tail: ~12′ or elongated coma, PA 280), elongated drop-like, very diffuse, “head” is slightly brighter) 38x, 153/750 refractor (m1 and dia.), 60x, 254/1200 reflector (sketch). Nelm:6.1, 70 deg above horizon, SQM=19.8]
2017 Feb. 28.86 UT: m1=8.2, Dia.=8′, DC=2, ...  25×100 B ...  Juan Jose Gonzalez (Collada Pandenes – Cabrales, Asturias, Spain, ...  Alt. 474 m, 43º 25′ N, 5º 47′ W)  [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9 at zenith. Rural dark sky location, clear sky]
2017 Feb. 28.01 UT: m1=9.7, Dia.=20′, DC=1, ...  30.5-cm L f:4.9 (47x) ...  J. P. Navarro Pina (El Palmar, Murcia, Spain)
2017 Feb. 27.78 UT: m1=8.6, Dia.=14′, DC=1/, ...  20×100 B ...  Martin Lehky (Czech Republic)
2017 Feb. 27.55 UT: m1=9.4, Dia.=12′, DC=1, ...  20-cm Dobson ...  Con Stoitsis (Melbourne, Australia) [Very Large and diffused, looks fainter than actually is my previous mag estimate may of been conservative]
2017 Feb. 27.04 UT: m1=8.2, Dia.=&20′, DC=1, ...  10×50 B ...  Piotr Guzik (Koskowa Góra, Poland, ...  Alt. 810 m, 49º 45′ N, 19º 47′ E) [Very large and diffuse, but still relatively easy to see. Excellent transparency. SQM-L: 21.3 at zenith]
2017 Feb. 25.96 UT: m1=10.0 DSLR, Dia.=7.8′, Tail= 0.28 deg. in p.a. 280 deg., ...  6.8-cm R + DSLR V, f/4.8 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland)
2017 Feb. 25.83 UT: m2=12.5 CCD, Dia.=1.26′, DC=6/, Tail= 9.8′ in PA: 289 deg., ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Feb. 24.98 UT: m1=8.4, Dia.=&15′, DC=2, Tail= 0.5 deg. in PA:~250 deg., ...  10×50 B ...  Piotr Guzik (Teodorów, Poland, Alt. 287 m, 50º 27′ N, 20º 18′ E) [Sidgwick method used. Still relatively easy to see in 10×50 binoculars, faint broad dust tail barely visible. Excellent transparency. SQM: 21.3 at zenith]
2017 Feb. 24.97 UT: m2=12.7 CCD, Dia.=1.55′, DC=6/, Tail= 6′ in PA: 286 deg., ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Feb. 24.93 UT: m1=10.0:, Dia.=5′, DC=1, ...  25.4-cm L f:5 (64x) ...  Maik Meyer (Limburg, Germany)
2017 Feb. 24.93 UT: m1=[10.2, NEGATIVE, Dia.=5.0′, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.) [Already not visible for me. Fainter than 10.2 mag.]
2017 Feb. 24.91 UT: m1=7.8, Dia.=12′, DC=2, ...  10×50 B ...  Juan Jose Gonzalez (Villasecino, Leon, Spain, ...  Alt. 1220 m, 42º 58′ N, 6º 01′ W) [Sidgwick method. Tycho-2 comparison stars. SQM : 21.3 at zenith. Dust tail: 1.2-deg in p.a. 290 deg. Mountain location, very clear sky]
2017 Feb. 24.77 UT: m1=9.3, Dia.=8.2’, DC=1/, ...  25-cm L f:5 (70x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Feb. 24.89 UT: m1=8.1, Dia.=14′, DC=2, ...  20×80 B ...  Neil Norman (Ipswich, Suffolk, England)
2017 Feb. 23.96 UT: m1=7.5, Dia.=20×30′, DC=0-1, ...  15×70 B & 10.2-cm R (20x) ...  Gabor Santa (Göd, county Pest, Hungary) [Elongated to East-West. Nelm: 5.7, 65 deg above horizon]
2017 Feb. 23.90 UT: m1=8.0, Dia.=17′, DC=2, ...  20×80 B ...  Neil Norman (Ipswich, Suffolk, England)
2017 Feb. 23.64 UT: m1=8.0, Dia.=22.1’, DC=1, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, coma elongated to WNW approximately. Enhances slightly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= S, ...  Cat= TK]
2017 Feb. 22.85 UT: m1=7.7, Dia.=12′, DC=2, ...  10×50 B ...  Juan Jose Gonzalez (Alto de la Colladona, Asturias, Spain, ...  Alt.910 m, 43º 11′ N, 5º 37′ W) [Sidgwick method. Tycho-2 comparison stars. SQM : 21.1 at zenith. Fanned dust tail spanning from 270 deg. to 290 deg., 0.7-deg in p.a. 290 deg. Mountain location, very clear sky]
2017 Feb. 22.19 UT: m1=8.6, Dia.=10′, DC=2, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Feb. 21.22 UT: m1=7.8, Dia.=12′, DC=2, ...  10×50 B ...  Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain, ...  Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Sidgwick method. Tycho-2 comparison stars. SQM : 21.4 at zenith. Mountain location, very clear sky]
2017 Feb. 20.57 UT: m1=7.6, Dia.=15.1’, DC=2, ...  7×50 B ...  Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter, coma slightly elongated to the West approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= S, ...  Cat= TK]
2017 Feb. 19.00 UT: m1=8.3, Dia.=&10′, DC=1/, ...  25.4-cm L f:5 (64x) ...  Maik Meyer (Limburg, Germany)
2017 Feb. 17.99 UT: m1=7.3, Dia.=19′, DC=2, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Feb. 17.85 UT: m2=14.0 CCD, Dia.=1.1′, DC=6, ...  20-cm L+CCD ...  Danil Sidorko (Korenovsk, Russia) [nuclear measured bright]
2017 Feb. 16.96 UT: m1=7.5, Dia.=15′, DC=2, ...  10×50 B ...  Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain, ...  Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Sidgwick method. Tycho-2 comparison stars. SQM : 21.4 at zenith. Mountain location, very clear sky]
2017 Feb. 16.83 UT: m1=14.2 CCD, Dia.=1′, DC=6/, ...  20-cm L+CCD ...  Danil Sidorko (Korenovsk, Russia) [nuclear measured bright]
2017 Feb. 16.04 UT: m1=8.1, Dia.=10′, DC=1/, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 Feb. 15.91 UT: m1=7.1, Dia.=30.0′, DC=d1, ...  5.0-cm B (7x) ...  Uwe Pilz (Leipzig, Germany)
2017 Feb. 15.90 UT: m1=7.0, Dia.=25′, DC=2, ...  20×80 B ...  Neil Norman (Ipswich, Suffolk, England)
2017 Feb. 15.88 UT: m1=8.9, Dia.=15′, DC=0/, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.) [Difficult, extremely diffuse comet]
2017 Feb. 15.87 UT: m1=6.8, Dia.=&30′, DC=1, ...  10×50 B ...  Piotr Guzik (Koskowa Góra, Poland, Alt. 800 m, 49º 45′ N, 19º 47′ E) [Sidgwick method used. Easy to see, extremely large and diffuse, elongated. In 33 cm telescope, small, relatively bright central condensation visible far away from geometric center of the coma. Coma significantly “flattened”, about 30’x20′ in size. Excellent transparency. SQM: 21.1 at zenith]
2017 Feb. 15.04 UT: m1=7.9, Dia.=10′, DC=2, ...  25×100 B ...  Martin Lehky (Czech Republic)
2017 Feb. 14.84 UT: m1=13.0 CCD, Dia.=0.81′, DC=7, ...  0.25m f/4.7 reflector + CCD ...  Sergey Shurpakov (C36, Baran’, Belarus)
2017 Feb. 14.49 UT: m1=[7.3, ...  5-cm B (7x) ...  Salvador Aguirre (Hermosillo, Sonora, Mexico)
2017 Feb. 14.22 UT: m1=7.8, Dia.=7′, DC=2, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Feb. 12.50 UT: m1=7.3:, DC=2, ...  5-cm B (7x) ...  Salvador Aguirre (Hermosillo, Sonora, Mexico)
2017 Feb. 11.52 UT: m1=[6.7, ... 5-cm B (7x) ...  Salvador Aguirre (Hermosillo, Sonora, Mexico)
2017 Feb. 10.53 UT: m1=6.7:, Dia.=&15′, DC=3/, ...  5-cm B (7x) ...  Salvador Aguirre (Hermosillo, Sonora, Mexico)
2017 Feb. 10.04 UT: m1=6.5 CCD, Dia.=6′, DC=2, ...  20-cm L+CCD ...  Danil Sidorko (Korenovsk, Russia) [very clear sky]
2017 Feb. 09.51 UT: m1=6.5, Dia.=11′, DC=2/, ...  5-cm B (7x) ...  Salvador Aguirre (Hermosillo, Sonora, Mexico)
2017 Feb. 08.24 UT: m1=6.7, Dia.=22′, DC=2, ...  6×40 monocular ...  Juan Jose Gonzalez (Cea, Leon, Spain, Alt. 880 m, 42º 28′ N, 5º 0′ W) [Sidgwick method. Tycho-2 comparison stars. SQM : 21.7 at zenith. Rural dark sky location)
2017 Feb. 08.23 UT: m1=8.3, Dia.=6′, DC=2, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Feb. 06.83 UT: m1=6.9, Dia.=16′, DC=2, ...  10x70 R ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Feb. 06.82 UT: m1=7.9, Dia.=11′, DC=1, ...  40.0-cm L f/4.5 (36x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 07.77 UT: m1=6.1, Dia.=6.5′, DC=6, ...  20×80 B ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain) [Lightmoon 85 deg. distance , Sidgwick method , Altitude 7º , NLM=5.0]
2017 Jan. 07.64 UT: m1=6.8, Dia.=8′, DC=4/5, ...  7-cm B (15x) ...  Danil Sidorko (Korenovsk, Russia) [alt. 8.5°, very clear sky]
2017 Jan. 06.77 UT: m1=6.5, Dia.=3′, DC=6/, ...  10×50 B ...  Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, ...  Alt. 1190 m, 43º 09′ N, 5º 54′ W) [Morris method. Tycho-2 comparison stars at the same low altitude (9 deg) as the comet. SQM: 20.0 at zenith. Moonlight interference. Mountain location, very clear sky]
2017 Jan. 06.72 UT: m1=6.3, Dia.=5′, DC=4/, ...  10×50 B ...  Maik Meyer (Eppenrod, Germany) [comet 7 deg above horizon, comp. stars w/in 0.5 deg height]
2017 Jan. 05.76 UT: m1=6.8, Dia.=3′, DC=7, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Jan. 05.76 UT: m1=7.0, Dia.=3′, DC=7, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Jan. 05.77 UT: m1=6.3, Dia.=3.2′, DC=4/, ...  20×60 B ...  José J. Chambó (Benali, Valencia, España)
2017 Jan. 05.75 UT: m1=6.3, Dia.=4.5′, DC=9, ...  20×80 B ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain) [Lightmoon 65 deg. distance, Sidgwick method, Tycho-2 stellar catalogue stars 6350-1500-1 , 6350-1098-1]
2017 Jan. 03.77 UT: m1=6.8, Dia.=2.5′, DC=7, ...  10×50 B ...  Juan Jose Gonzalez (Linares – Proaza, Asturias, Spain, ...  Alt. 843 m, 43º 16′ N, 6º 02′ W) [Morris method. Tycho-2 comparison stars at the same low altitude (9 deg) as the comet. SQM: 20.6 at zenith. Some moonlight interference. Mountain location, very clear sky]
2017 Jan. 01.76 UT: m1=7.1, Dia.=6.5′, DC=6, ...  20×80 B ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain) [Sidgwick method, comet low altitude, tycho-2 stellar catalogue]
2017 Jan. 01.69 UT: m1=6.9, Dia.=2.0′, ...  32-cm reflector ...  Uwe Pilz (Leipzig, Germany)

43P/Wolf-Harrington
2017 Jan. 24.80 UT: m1=13.6, Dia.=0.6′, DC=2/, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)

41P/Tuttle-Giacobini-Kresak
2017 July 14.97 UT: m1=10.6, Dia.=5′, DC=2, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2017 July 02.05 UT: m1=10.7, Dia.=5′, DC=2, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2017 June 30.63 UT: m1=11.2, Dia.=4.5’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Slightly affected by background stars in coma. Coma diffuse, weakly condensed. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 June 26.88 UT: m1=[10.6, NEGATIVE, Dia.=3′, ...  20×80 B .... Marek Biely (244 m.a.s.l., Brno, Czech Republic) [Already not visible. Fainter than 10.6 mag.]
2017 June 26.52 UT: m1=11.5, Dia.=4.5’, DC=2, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 June 22.74 UT: m1=11.1, Dia.=3.5’, DC=2/, ...  25cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Close to star. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 June 21.54 UT: m1=10.4, Dia.=5.4’, DC=2, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 June 20.94 UT: m1=10.2, Dia.=6′, DC=1, ...  10×100 B ...  Martin Lehky (Czech Republic)
2017 June 19.94 UT: m1=10.4, Dia.=4.5′, DC=1/, ...  10×100 B ...  Martin Lehky (Czech Republic)
2017 June 18.94 UT: m1=10.4, Dia.=4′, DC=1/, ...  10×100 B ...  Martin Lehky (Czech Republic)
2017 June 17.98 UT: m1=14.5 CCD, Dia.=0.30′, DC=7/, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 June 14.95 UT: m1=9.5, Dia.=5′, DC=1, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 June 13.92 UT: m1=10.3, Dia=6′, DC=1, no tail, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 June 12.94 UT: m1=9.8, Dia.=5′, DC=1/, ...  10×100 B ...  Martin Lehky (Czech Republic)
2017 June 02.99 UT: m1=9.4, Dia.=8′, DC=1, ...  10×100 B ...  Martin Lehky (Czech Republic)
2017 May  31.96 UT: m1=9.4, Dia.=8′, DC=1, ...  10-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  30.02 UT: m1=9.2, Dia.=6′, DC=1/, ...  10-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  29.73 UT: m1=9.5, Dia.=3’, DC=3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma enhances in Swan Band filter. Transparent outer coma, semi-transparent inner coma. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= S, ...  Cat= TK]
2017 May  28.95 UT: m1=9.2, Dia.=6′, DC=1, ...  10-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  28.01 UT: m1=10.0:, Dia.=2.4′, ...  30-cm L f/5 ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland) [Twilight]
2017 May  28.00 UT: m1=8.7 DSRL, Dia.=18′, ...  3.4-cm A + DSLR V f/4 ...  Mieczyslaw Leszek Paradowski (Dąbrowa, Poland)
2017 May  27.95 UT: m1=9.0, Dia.=7′, DC=1/, ...  10-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  27.86 UT: m1=9.8, Dia.=4′, DC=2/, ...  25-cm L (42x, 70x, 150x) ...  Danil Sidorko (Korenovsk, Russia) [SQM= 20.51]
2017 May  26.92 UT: m1=9.0, Dia.=7′, DC=1, ...  10-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  26.02 UT: m1=8.8, Dia.=8′, DC=1/, ...  10-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  25.93 UT: m1=9.7, Dia.=1.74′, DC=2/, ...  11-cm B (20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  25.92 UT: m1=11.6 CCD, Dia.=2.19′, DC=6/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  25.01 UT: m1=8.8, Dia.=8′, DC=1/, ...  10-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  24.09 UT: m1=7.8, Dia.=9′, DC=2, ...  8-cm R (20x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5 at zenith]
2017 May  23.98 UT: m1=9.7, Dia=8′, DC=2, no tail, ...  15-cm T (30x) ...  Carlos Labordena (Castellón, España)
2017 May  23.90 UT: m1=8.7, Dia.=8′, DC=1, ...  10-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  22.94 UT: m1=8.7, Dia.=8′, DC=1, ...  10-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  22.89 UT: m1=11.7, Dia.=3′, DC=1, ...  30.5-cm L f/4.9 (94x) ...  J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain) [comet poor very diffuse and difficult for observed]
2017 May  21.97 UT: m1=12.1 CCD, Dia.=1.07′, DC=6/, ...  25-cm reflector f/4.7 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  21.95 UT: m1=9.6, Dia.=2.00′, DC=2, ...  11-cm B (20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  21.94 UT: m1=12.1 CCD, Dia.=1.90′, DC=7/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  21.88 UT: m1=9.7, Dia.=6′, DC=1/, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 May  19.99 UT: m1=9.6, Dia=8′, DC=3, no tail, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 May  19.94 UT: m1=12.0 CCD, Dia.=2.19′, DC=4/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  19.91 UT: m1=8.4, Dia.=9′, DC=1, ...  10-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  19.89 UT: m1=9.1, Dia.=6′, DC=2, ...  20×80 B ...  Marek Biely (Brno, Czech Republic) [Observed through thin high clouds but with almost no interference]
2017 May  19.82 UT: m1=9.2, Dia.=5.2′, DC=2, ...  25-cm L (42x, 70x, 150x) ...  Danil Sidorko (Korenovsk, Russia)
2017 May  18.97 UT: m1=8.9, Dia.=7′, DC=2, ...  42-cm L (42x) ...  Martin Lehky (Czech Republic)
2017 May  18.91 UT: m1=8.7, Dia.=8′, DC=2, ...  20×80 B ...  Marek Biely (Brno, Czech Republic) [Much fainter than before and very diffuse]
2017 May  18.96 UT: m1=8.4, Dia.=9′, DC=1/, ...  10-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  18.83 UT: m1=9.5, Dia.=6′, DC=2, ...  25-cm L (42x, 70x, 150x) ...  Danil Sidorko (Korenovsk, Russia)
2017 May  17.95 UT: m1=9.8, Dia.=2.24′, DC=2/, ...  11-cm B(20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  17.91 UT: m1=11.7 CCD, Dia.=2.34′, DC=6/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  15.88 UT: m1=8.9, Dia.=2.44′, DC=2/, ...  11-cm B(20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  14.84 UT:m1=9.2:, Dia.=10′, DC=1/, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 May  13.95 UT: m1=11.6 CCD, Dia.=2.34′, DC=6, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  12.90 UT: m1=11.7 CCD, Dia.=2.06′, DC=6, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  11.90 UT: m1=11.4 CCD, Dia.=2.48′, DC=5/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  09.92 UT: m1=11.3 CCD, Dia.=2.34′, DC=6/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  08.76 UT: m1=8.3, Dia.=8.8, DC=1, ...  25×100 B ...  David A. J. Seargent (Cowra, NSW, Australia) [Well enhanced using Swan Band filter. Low surface brightness]
2017 May  06.73 UT: m1=8.8, Dia.=9.5’, DC=3/4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Outer coma large and transparent, slightly brighter but diffused inner coma. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 May  06.21 UT: m1=7.2, Dia.=13′, DC=2, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 May  04.83 UT: m1=10.8 CCD, Dia.=2.77′, DC=6/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  04.73 UT: m1=10.6, Dia.=5.5′, DC=1, ...  40.0-cm L f/4.5 (36x) ...  Seiichi Yoshida (Gunma, Japan)
2017 May  03.83 UT: m1=8.4, Dia.=15′, DC=1/, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 May  03.88 UT: m1=10.8 CCD, Dia.=2.92′, DC=6/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  03.07 UT: m1=7.0, Dia.=15′, DC=2/, ...  12×45 monocular ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.7 at zenith]
2017 May  03.02 UT: m1=8.4, Dia.=9′, DC=2, ...  8-cm B(10x) ...  Martin Lehky (Czech Republic)
2017 May  02.87 UT: m1=9.6 CCD, Dia.=2.34′, DC=6/, ...  7-cm refractor f/4.5 + CCD ...  Sergey Shurpakov (Baran’, Belarus)
2017 May  02.85 UT: m1=8.6, Dia.=9.11′, DC=2/, ...  11-cm B(20x) ...  Sergey Shurpakov (Baran’, Belarus)
2017 Apr. 30.95 UT: m1=8.3, Dia.=10′, DC=2, ...  25×100 B ...  Martin Lehky (Czech Republic) [Sidgwick Method]
2017 Apr. 30.27 UT: m1=7.6, Dia.=12′, DC=2, ...  20X100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Apr. 28.82 UT: m1=8.3, Dia.=15′, DC=1/, ...  13-cm L (52x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Apr. 28.73 UT: m1=8.1, Dia.=10’, DC=4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Very tenuous and large outer coma, brightens gradually to an opaque inner coma. Enhances in Swan Band filter. Low altitude = 17.2°. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Apr. 28.07 UT: m1=7.1, Dia.=15′, DC=2/, ...  12×45 monocular ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.6 at zenith]
2017 Apr. 26.901 TU: m1=8.9, Dia.=8′, DC=2, ...  20×80 B ...  Neil Norman (FRAS, Ipswich, England)
2017 Apr. 25.914 UT: m1=8.0, Dia.=10′, DC=3, ...  20×80 B ...  Neil Norman (FRAS, Ipswich, England)
2017 Apr. 25.03 UT: m1=8.0, Dia.=10′, DC=2, ...  10×80 B ...  Martin Lehky (Czech Republic) [Sidgwick Method]
2017 Apr. 24.917 UT: m1=7.5, Dia.=15′, DC=2, ...  20×80 B ...  Neil Norman (FRAS, Ipswich, England)
2017 Apr. 22.84 UT: m1=7.1, Dia.=15′, DC=3, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Apr. 22.26 UT: m1=6.8, Dia.=18′, DC=2, ...  7X50 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Apr. 21.11 UT: m1=6.9, Dia.=15′, DC=3, ...  12×45 monocular ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.7 at zenith]
2017 Apr. 20.92 UT: m1=7.2, Dia.=15′, DC=2, no tail, ...  10.2-cm R (20x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 19.96 UT: m1=11.3 CCD, Dia=1.15′,DC=6/, ...  0.25-m f/4.7 reflector + CCD ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Apr. 19.906 UT: m1=7.2, Dia.=15′, DC=2, ...  20×80 B ...  Neil Norman (FRAS, Ipswich, England)
2017 Apr. 19.89 UT: m1=7.3, Dia.=15′, DC=3, ...  20×88 B ...  Maik Meyer (Limburg, Germany)
2017 Apr. 19.86 UT: m1=6.9, Dia.=20′, DC=3, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia) [S – Sidgwick`s method]
2017 Apr. 19.86 UT: m1=8.1, Dia.=10′, DC=3, ...  11-cm B(20x) ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Apr. 18.917 UT: m1=7.1, Dia.=17′, DC=2, ...  20×80 B ...  Neil Norman (FRAS, Ipswich, England)
2017 Apr. 18.89 UT: m1=7.1, Dia.=17′, DC=3/, ...  20×88 B ...  Maik Meyer (Limburg, Germany)
2017 Apr. 17.79 UT: m1=7.1, Dia.=17′, DC=3/, ...  13-cm L (26x) ... Alexsandr Morozov (Novozybkov, Russia) [M – Morris`s method]
2017 Apr. 16.76 UT: m1=6.5, Dia.=11.5′, DC=5, ...  25-cm L (42x, 70x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Apr. 15.868 UT: m1=7.1, Dia.=11′, DC=2, ...  20×80 B ...  Neil Norman (FRAS, Ipswich, England)
2017 Apr. 15.85 UT: m1=6.2, Dia.=25′, DC=3/, ...  7-cm B (15x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Apr. 14.90 UT: m1=6.5, Dia.=16′, DC=2, no tail, ...  10.2-cm R (20x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 14.90 UT: m1=9.5, Dia.=10′, DC=0, ...  30.5-cm L (97x) ...  J. P. Navarro Pina (Campos del rio, Murcia, Spain)
2017 Apr. 13.88 UT: m1=6.6, Dia.=14′, DC=2, ...  20×88 B ...  Maik Meyer (Limburg, Germany)
2017 Apr. 13.86 TU: m1=6.2, Dia.=20′, DC=3, ...  20×80 B ...  Neil Norman (FRAS, Ipswich, England) [Before Moonrise]
2017 Apr. 12.86 UT: m1=6.6, Dia.=15′, DC=2, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 12.85 UT: m1=6.2, Dia.=17′, DC=2/, ...  12×45 monocular ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. Astronomical twilight, before moonrise. SQM: 20.5 at zenith. Mountain location, very clear sky]
2017 Apr. 07.16 UT: m1=6.8, Dia.=22′, DC=3, no tail, ...  8-cm B(11x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 07.15 UT: m1=6.0, Dia.=25′, DC=2/, ...  12×45 monocular ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. Some moonlight interference. SQM: 20.4 at zenith]
2017 Apr. 05.08 UT: m1=6.7, Dia.=23′, DC=2/, ...  10×50 B ...  Maik Meyer (Limburg, Germany)
2017 Apr. 05.01 UT: m1=7.3, Dia.=10′, DC=3, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Apr. 04.13 UT: m1=6.6, Dia.=17′, DC=2/, ...  10×50 B ...  Maik Meyer (Limburg, Germany)
2017 Apr. 04.10 UT: m1=6.4, Dia.=25′, DC=3, ...  12×45 monocular ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m,  42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.7 at zenith]
2017 Apr. 02.97 UT: m1=10.8 CCD, Dia.=1.93′, DC=6/, ...  0.15-m f/3.2 reflector + CCD ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Apr. 02.14 UT: m1=7.0, Dia.=20′, DC=3, no tail, ...  8-cm B(11x) ...  Carlos Labordena (Castellón, España)
2017 Apr. 02.09 UT: m1=7.2, Dia.=18′, DC=3, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.)
2017 Apr. 01.86 UT: m1=8.5, Dia:10′, DC=3, ...  30.5-cm L (47x) ...  J. P. Navarro Pina (Bullas, Murcia, Spain)
2017 Apr. 01.16 UT: m1=6.5, Dia.=20′, DC=3, ...  10×50 B ...  Juan Jose Gonzalez (Candanedo de Fenar, Leon, Spain, ...  Alt. 1060 m, 42º 49′ N, 5º 34′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4 at zenith. Mountain location, very clear sky]
2017 Mar. 31.92 UT: m1=7.0, Dia.=15′, DC=1, ...  20X80 B ...  Valentín Díaz (Aspe, Alicante, España)
2017 Mar. 31.83 UT: m1=7.3, Dia.=11′, DC=5, ...  25-cm L (42x & 70x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 29.89 UT: m1=7.2, Dia.=15′, DC=3, ...  7×50 B ...  Francios Kugel (Dauban, France)
2017 Mar. 29.83 UT: m1=7.4, Dia.=18′, DC=5, ...  25-cm L (42x & 70x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 29.16 UT: m1=7.3, Dia.=20′, DC=2, no tail, ...  8-cm B(11x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 28.89 UT: m1=7.7, Dia.=17′, DC=2, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.)
2017 Mar. 28.85 UT: m1=7.7, Dia.=10′, DC=4, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Mar. 28.10 UT: m1=6.5, Dia.=25′, DC=3, ...  5×30 monocular ...  Juan Jose Gonzalez (Collado del Fresno, Asturias, Spain, ...  Alt. 1280 m, 43º 10′ N, 5º  54′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5 at zenith]
2017 Mar. 27.86 UT: m1=7.7, Dia.=14′, DC=3, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.)
2017 Mar. 26.93 UT: m1=8.1, Dia.=12′, DC=2/, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.) [Relatively bright and large]
2017 Mar. 26.92 UT: m1=7.0, Dia.=18′, DC=4, ...  8×56 B ...  Sandor Szabo (Hungary)
2017 Mar. 26.82 UT: m1=7.0, Dia.=15′, DC=3, ...  8.8-cm B (20x) ...  Mail Mayer (Limburg, Germany)
2017 Mar. 25.90 UT: m1=7.3, Dia.=17′, DC=2/, ...  8.8-cm B (20x) ...  Mail Mayer (Limburg, Germany)
2017 Mar. 25.894 UT: m1=7.1, Dia.=18′, DC=4, ...  11.4-cm L f/8 (45x) ...  Neil Norman (FRAS, Ipswich, England)
2017 Mar. 25.83 UT: m1=10.0, Dia.=7′, DC=6, ...  30.5-cm L f:4.9 (97x) ...  J. P. Navarro Pina (El Ardal, Murcia, Spain) [altitude= 700 mts., Lm= 5.9]
2017 Mar. 24.95 UT: m1=7.5, Dia.=17′, DC=4, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia) (Lm=6.2)
2017 Mar. 24.898 UT: m1=7.4, Dia.=15′, DC=4, ...  11.4-cm L f:8 (45x) ...  Neil Norman (FRAS, Ipswich, England)
2017 Mar. 24.84 UT: m1=7.1, Dia.=19, DC=1/, ...  8.8-cm B (20) ...  Maik Meyer (Limburg, Germany)
2017 Mar. 23.81 UT: m1=10.8 CCD, Dia.=15′, DC=6, ...  20-cm L + CCD ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 23.80 UT: m1=8.2, Dia.=8.0′, DC=5/, ...  25-cm (42x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 23.75 UT: m1=8.9, Dia.=22′, DC=1.5, ...  6-cm B (20x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Mar. 23.73 UT: m1=7.8, Dia.=18′, DC=6/, ...  15×70 B ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 22.83 UT: m1=7.7, Dia.=15′, DC=2, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 22.58 UT: m1=7.3, Dia.=16′, DC=2, ...  7.0cm R (10x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Mar. 22.54 UT: m1=8.3, Dia.=10′, DC=3/, ...  40.0-cm L f/4.5 (36x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Mar. 21.875 UT: m1=8.2, Dia.=5′, DC=3, ...  11.4-cm L f:8 (45x) ...  Neil Norman (FRAS, Ipswich, England)
2017 Mar. 21.08 UT: m1=8.0, Dia.=8′, DC=2, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 15º]
2017 Mar. 21.04 UT: m1=8.6, Dia.=22′, DC=2, ...  6-cm B (20x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Mar. 21.03 UT: m1=8.9, Dia.=10′, DC=3, ...  13-cm L (26x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Mar. 20.875 UT: m1=9.2, Dia.=7′, DC=3, ...  11.4-cm L f:8 (45x) ...  Neil Norman (Ipswich, England)
2017 Mar. 20.02 UT: m1=7.5, Dia.=20′, DC=2/, ...  10×50 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.7 at zenith]
2017 Mar. 19.88 UT: m1=7.9, Dia.=10′, DC=2, no tail, ...  8-cm B (11x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 19.87 UT: m1=8.0, Dia.=8′, DC=3, no tail, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 18.95 UT: m1=9.6, Dia.=5′, DC=–, ...  30-cm L (50X) ...  Valentín Díaz (La Romaneta, Alicante, España)
2017 Mar. 18.84 UT: m1=9.5, Dia.=5′, DC=3, ...  30.5-cm L f:4.9 (97x) ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain)
2017 Mar. 17.74 UT: m1=9.4, Dia.=7′, DC=3, ...  13-cm L (52x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Mar. 16.85 UT: m1=7.6, Dia.=15′, DC=2, ...  8.8-cm B (20x) ...  Maik Meyer (Limburg, Germany)
2017 Mar. 16.82 UT: m1=9.8, Dia.=5′, DC=3, ...  30.5-cm L f:4.9 (97x) ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain)
2017 Mar. 15.89 UT: m1=7.8, Dia.=17′, DC=2/, ...  10×50 B ...  Juan Jose Gonzalez (Alto del Trichero – Soto y Amío, Leon, Spain, ...  Alt. 1190 m, 42º 46′ N, 5º 53′ W) [Sidgwick method. Tycho-2 comparison stars. Mountain location, very clear sky. SQM: 21.4 at zenith]
2017 Mar. 15.81 UT: m1=11.2, Dia.=5′, DC=3, ...  30.5-cm L f:4.9 (97x) ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain)
2017 Mar. 15.80 UT: m1=7.5, Dia.=20′, DC=3, ...  10×50 B ...  Piotr Guzik (Koskowa Góra, Poland.  Alt. 810 m, 49º 45′ N, 19º 47′ E) [Morris method used. Very bright, easily visible in binoculars. SQM-L: 21.1 at zenith]
2017 Mar. 14.84 UT: m1=9.9, Dia.=3′, DC=4, no tail, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 Mar. 14.73 UT: m1=9.6, Dia.=7.5′, DC=3, ...  13-cm L (65x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Mar. 13.76 UT: m1=11.3 CCD, Dia.=1.33′, DC=6/, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 06.97 UT: m1=9.5, Dia.=3.0′, DC=5/, ...  25-cm (42x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 06.95 UT: m1=10.5 CCD, Dia.=5′, DC=6, ...  20-cm L + CCD ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 06.60 UT: m1=9.2, Dia.=7’, DC=5, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Enhances well in Swan band filter. Outer coma transparent, inner coma opaque with hints of faint stellaring in good  seeing. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Mar. 05.95 UT: m1=12.2 CCD, Dia.=6.3′, DC=6, ...  20-cm L + CCD ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 05.93 UT: m1=9.3, Dia.=5.2′, DC=6, ...  25-cm (42x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Mar. 03.85 UT: m2=11.8 CCC, Dia.=1.48′, DC=6/, ...  0.25-m f/4.7 L + CCD ...  Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 03.72 UT: m1=10.4, Dia.=5′, DC=3, ...  40.0-cm L f/4.5 (36x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Mar. 02.10 UT: m1=10.2, Dia.=6′, DC=2, ...  22-cm L (60x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Mar. 01.90 UT: m1=9.5, Dia.=10′, DC=s5, ...  15×70 B & 25.4-cm L (75x & 109x) ...  Gabor Santa (Göd, county Pest, Hungary) [15×70 B (m1 and dia.), 25.4-cm L 75x and 109x m2 and sketch. Nelm:6.1, 73 deg above horizon, SQM=19.8]
2017 Mar. 01.82 UT: m1=10.4, Dia.=2′, DC=2, ...  30.5-cm L f:4.9 (97x) ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain)
2017 Mar. 01.01 UT: m1=9.1, Dia.=7′, DC=2, ...  25×100 B ...  Juan Jose Gonzalez (Grandota – Oviedo, Asturias, Spain, Alt. 470 m, 43º 21′ N, 5º  47′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.3 at zenith. Rural location, clear sky]
2017 Feb. 27.80 UT: m1=10.0, Dia.=6′, DC=3, ...  20×100 B ...  Martin Lehky (Czech Republic)
2017 Feb. 27.03 UT: m1=9.2, Dia.=12′, DC=3, ...  10×50 B ...  Piotr Guzik (Koskowa Góra, Poland, Alt. 810 m, 49º 45′ N, 19º 47′ E) [Morris method used. Easy to see, significantly brighter than two days ago. Excellent transparency. SQM-L: 21.3 at zenith]
2017 Feb. 25.915 UT: m1=10.0, m2=13.5, Dia.=3.8′, DC=s4, ...  15.3-cm R (68x) ...  Gabor Santa (Göd, county Pest, Hungary) [nelm: 5.7, 66 deg above horizon]
2017 Feb. 25.89 UT: m1=9.5 DSLR, Dia.=7.8′, ...  6.8-cm R + DSLR V, f/4.8 ...  Mieczyslaw Leszek Paradowski (Lublin, Poland)
2017 Feb. 25.83 UT: m2=12.0 CCD, Dia.=1.33′, DC=6/, ...  0.25-m f/4.7 reflector + CCD ...  S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Feb. 24.97 UT: m1=10.2, Dia.=6′, DC=3, ...  27-cm L (53x) ...  Piotr Guzik (Teodorów, Poland, Alt. 287 m, 50º 27′ N, 20º 18′ E) [Morris method used. Bright, very large. Relatively easy to see in 10×50 binoculars at m1=9.8, Dia.=10′, DC=3. Excellent transparency. SQM: 21.3 at zenith]
2017 Feb. 24.91 UT: m1=10.9, Dia.=2.5′, DC=3, ...  25.4-cm L f:5 (64x) ...  Maik Meyer (Limburg, Germany)
2017 Feb. 24.90 UT: m1=9.4, Dia.=6′, DC=2, ...  25×100 B ...  Juan Jose Gonzalez (Villasecino, Leon, Spain, Alt. 1220 m, 42º 58′ N, 6º 01′ W)  [Sidgwick method. Tycho-2 comparison stars. SQM : 21.3 at zenith. Zodiacal light. Mountain location, very clear sky. In 20 cm SCT (77x): m1=10.0]
2017 Feb. 24.75 UT: m1=10.4, Dia.=4.5’, DC=2/, ...  25-cm L f:5 (70x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Feb. 23.90 UT: m1=9.9, Dia.=5′, DC=3, ...  15.3-cm R (47x) ...  Gabor Santa (Göd, county Pest, Hungary) [nelm: 5.6, 66 deg above horizon]
2017 Feb. 23.63 UT: m1=10.5, Dia.=8.6’, DC=4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Opaque inner coma, transparent outer coma. Central condensation appears faintly stellar at x83, ...  Comet close to 10.3 magnitude star, slight interference. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Feb. 22.51 UT: m1=10.8, Dia.=4.7’, DC=4/5, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma slightly enhances in Swan Band filter, inner coma opaque. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Feb. 22.12 UT: m1=11.3, Dia.=3′, DC=2, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Feb. 21.94 UT: m1=10.6, m2=13.5, Dia.=3′, DC=s4, ...  25.4-cm L (92x) ...  Gabor Santa (Göd, county Pest, Hungary) [nelm: 5.7, 66 deg above horizon]
2017 Feb. 21.12 UT: m1=11.6, Dia.=2.5′, DC=2, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Feb. 20.46 UT: m1=10.7, Dia.=5.3’, DC=4, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma large and diffuse, transparent outer coma, opaque inner coma. Enhances slightly in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Feb. 18.99 UT: m1=11.4, Dia.=1.6′, DC=3/, ...  25.4-cm L f:5 (104x) ...  Maik Meyer (Limburg, Germany)
2017 Feb. 17.93 UT: m1=11.8, Dia.=1.5′, DC=3, no tail, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellón, España)
2017 Feb. 17.83 UT: m1=13.5 CCD, Dia.=1.7′, DC=3, ...  20-cm L+CCD ...  Danil Sidorko (Korenovsk, Russia)
2017 Feb. 17.70 UT: m1=11.7, Dia.=1.1’, DC=3/4, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Feb. 16.84 UT: m1=10.9, Dia.=4′, DC=2, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain, ...  Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Sidgwick method. Tycho-2 comparison stars. SQM : 21.4 at zenith. Mountain location, very clear sky]
2017 Feb. 16.77 UT: m1=13.1 CCD, Dia.=1.2′, DC=3, ...  20-cm L+CCD ...  Danil Sidorko (Korenovsk, Russia)
2017 Feb. 16.76 UT: m1=12.2, Dia.=1.5′, DC=3, ...  25-cm (48x) ...  Danil Sidorko (Korenovsk, Russia)
2017 Feb. 16.02 UT: m1=11.8, Dia.=2′, DC=2, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Feb. 15.86 UT: m1=12.0, Dia.=2.5, DC=0, ...  35.6-cm T f:11 (98x) ...  Alex Scholten (Bussloo, Netherlands)
2017 Feb. 15.85 UT: m1=10.8, Dia.=&4′, DC=3, ...  33-cm L (67x) ...  Piotr Guzik (Koskowa Góra, Poland, Alt. 800 m, 49º 45′ N, 19º 47′ E) [Morris method used. Small (~1′), well condensed central condensation at m2~12.0 immersed in large, diffuse halo. Excellent transparency. SQM: 21.1 at zenith]
2017 Feb. 14.80 UT: m1=11.1, Dia.=&4′, DC=3, ...  33-cm L (67x) ...  Piotr Guzik (Koskowa Góra, Poland, Alt. 800 m, 49º 45′ N, 19º 47′ E) [Morris method used. Small (~1′), well condensed central condensation at m2~12.0 immersed in large, diffuse halo. SQM: 20.8 at zenith]
2017 Feb. 13.75 UT: m1=12.5, Dia.=1.7′, ...  32.0-cm L f:5 (80x) ...  Uwe Pilz (Leipzig, Germany)
2017 Feb. 06.78 UT: m1=13.4, Dia.=0.8′, DC=3, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 31.68 UT: m1=13.5, Dia.=0.9’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse with weak central condensation. Close star of 11.1 mag, 1’ away in P.A. 338° on the edge of the coma. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Jan. 30.68 UT: m1=13.6, Dia.=0.8’, DC=2/, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight elongation to SE approximately. Slight brightening to centre, ...  does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Jan. 29.92 UT: m1=12.8, Dia.=2.8′, DC=2/, ...  35-cm L (178x) ...  Jakub Cerny (Senohraby, Czech Republic)
2017 Jan. 29.68 UT: m1=13.9, Dia.=0.7’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very small and diffuse. Does not enhance in Swan Band filter. Close to mag 13.5 star, 0.8’ away in P.A. 255°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Jan. 28.13 UT: m1=12.6, Dia.=2′, DC=2, ...  33-cm L (67x) ...  Piotr Guzik (Koskowa Góra, Poland, ...  Alt. 800 m, 49º 45′ N, 19º 47′ E) [Sidgwick method. APASS comparison stars. Comet faint and diffuse. At 114x small, condensed central condensation of ~14.0 mag also visible. SQM: 20.9 at zenith]
2017 Jan. 27.97 UT: m1=12.1, Dia.=2.5′, DC=1, ...  32.0-cm L (120x) ...  Uwe Pilz (Leipzig, Germany)
2017 Jan. 24.78 UT: m1=13.8, Dia.=0.7′, DC=3, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 24.23 UT: m1=11.5, Dia.=4′, DC=1/, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, ...  Alt. 1190 m, 43º 09′ N, 5º 54′ W) [Sidgwick method. APASS comparison stars. SQM: 21.5 at zenith. Mountain location, very clear sky]
2017 Jan. 23.86 UT: m1=13.5:, Dia.=&1.5′, DC=2, ...  33-cm L (67x) ...  Piotr Guzik (Koskowa Góra, Poland, ...  Alt. 800 m, 49º 45′ N, 19º 47′ E) [Sidgwick method used. Very faint and diffuse. SQM: 20.9 at zenith]
2017 Jan. 23.64 UT: m1=13.8, Dia.=0.8’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very small and diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]

29P/Schwassmann-Wachmann 1
2017 Nov. 14.78 UT: m1=13.5, Dia.=0.5′, DC=3, ...  30.5-cm L (94x) ...  J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain) [360 mts altitude]
2017 Nov. 14.73 UT: m1=13.4, Dia.=0.5′, DC=4, ...  60-cm L (187x) ...  Sandor Szabo (Hungary)
2017 Oct. 26.38 UT: m1=12.9, Dia.=0.9′, DC=2/, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Oct. 22.88 UT: m1=11.5, Dia.=2′, DC=2/, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Brighter inner coma diameter : 2′, providing m=11.5 (AQ). Faint and diffuse outer coma diameter : 4′, providing m=10.3: (TK), remnant of previous outbursts. Sidgwick method. Field stars checked in DSS. Altitude: 29 deg. SQM: 21.0]
2017 Oct. 19.46 UT: m1=12.0, Dia.=3.7’, DC=1, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, appears as a misty patch just above sky background threshold. Just visible at x39 so coma diameter may even be slightly larger. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 16.85 UT: m1=12.1, Dia=1.5′, DC=2, no tail, ...  20-cm SCT (117x) ...  Carlos Labordena (Castellón, España)
2017 Oct. 16.77 UT: m1=12.2, Dia.=1.1′, ...  20.3-cm L f/5.9 ...  Mieczyslaw Leszek Paradowski (Jabłonna, Poland)
2017 Oct. 13.81 UT: m1=11.7, Dia.=2.0′, DC=2/, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Brighter inner coma diameter : 2.0′, providing m=11.7 (AQ). Faint and diffuse outer coma diameter : 3′.5, providing m=10.5: (TK), remnant of previous outbursts. Sidgwick method. Field stars checked in DSS. Altitude: 33 deg. SQM: 21.0]
2017 Oct. 12.41 UT: m1=12.2, Dia.=1.8’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, slight brightening to centre. Pale blue in colour. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 27.60 UT: m1=11.9, Dia.=3’, DC=2, ...  25-cm L f:5 (39) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 25.49 UT: m1=[13.4, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Sep. 22.86 UT: m1=13.7, Dia.=0.9’, DC=1, ...  60-cm reflector (305x) ...  Sandor Szabo (Sopron, Hungary) [Very diffuse comet]
2017 Sep. 22.46 UT: m1=11.9, Dia.=3’, DC=2/3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, weakly condensed opaque centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 19.89 UT: m1=12.1, Dia=1.5′, DC=3, no tail, ...  20-cm T (94x) ...  Carlos Labordena (Castellón, España)
2017 Sep. 19.44 UT: m1=11.7, Dia.=3’, DC=2/3, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Coma diffuse with slightly brighter and iopaque centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 15.97 UT: m1=11.8, Dia=1.5′, DC=3, no tail, ...  20-cm SCT (120x) ...  Carlos Labordena (Castellón, España)
2017 Sep. 15.87 UT: m1=11.5, Dia.=2.0′, DC=4, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Cruce de Aralla – Embalse de Barrios de Luna, Leon, Spain, ...  Alt. 1110 m, 42º 54′ N, 5º 52′ W) [In evolution after the recent outbursts. Starlike central condensation, m2=14.0: (AQ). Brighter inner coma diameter : 2.0′, providing m=11.5 (AQ). Faint and diffuse outer coma diameter : 3′.5, providing m=10.3: (TK), remnant of previous outbursts. Sidgwick method. Field stars checked in DSS. Altitude: 32 deg. SQM: 21.1]
2017 Sep. 15.44 UT: m1=11.7, Dia.=2.5’, DC=3, ...  25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, opaque centre. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Sep. 13.89 UT: m1=12.5, Dia.=2.0′, DC=6, ...  30.5-cm L F/5 (97x) ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain)
2017 Sep. 13.89 UT: m1=13.2 CCD, Dia.=0.74′, DC=6/, ...  25-cm reflector f/4.7 ...  Sergey Shurpakov (Baran’, Belarus)
2017 Sep. 11.05 UT: m1=11.3, Dia.=2′, DC=4, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Sep. 07.94 UT: m1=11.2, Dia.=2′, DC=4/, ...  22-cm L (160x) ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Sep. 01.72 UT: m1=12.1, Dia.=0.9’, DC=5, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Post-outburst. Does not enhance in Swan Band filter, opaque centre, fuzzy semi-transparent outer coma. Low altitude = 19.1°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Sep. 01.04 UT: m1=11.7, Dia.=0.6′, DC=7, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Alcuetas – Villabraz, Leon, Spain, ...  Alt. 885 m, 42º 16′ N, 5º 27′ W) [After new outburst. Starlike central condensation : m2=12.5: (AQ). Brighter inner coma diameter : 0.6′, providing m=11.7 (AQ). Faint and diffuse outer coma was glimpsed, from a lower location than in my previous Aug. 25.00 UT observation. Sidgwick method. Field stars checked in DSS. Altitude: 26 deg. SQM: 21.0]
2017 Aug. 30.68 UT: m1=12.0, Dia.=0.4’, DC=7, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Post-outburst. Close to 12th magnitude star. Coma dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Aug. 25.00 UT: m1=12.5, Dia.=0.7′, DC=6, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Puerto del Pando – Prioro, Leon, Spain, ...  Alt. 1430 m, 42º 56′ N, 4º 57′ W) [In outburst. Starlike central condensation : m2=13.7 (APASS). Brighter inner coma diameter : 0.7′, providing m=12.5 (APASS). Faint and diffuse outer coma diameter : 3′, providing m=10.5: (Tycho-2). ( This faint 3′ outer coma, remnant of previous outbursts, was also observed in pre-outburst dates : Aug. 16.91 and 20.92 UT ). Sidgwick method. Field stars checked in DSS. Altitude: 33 deg. SQM: 21.4]
2017 Aug. 23.45 UT: m1=13.9, Dia.=1.1’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 19.46 UT: m1=13.9, Dia.=0.8’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 14.45 UT: m1=13.9. Dia.=1.1’, DC=1, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, just above background threshold. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Aug. 01.73 UT: m1=13.4, Dia.=1’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 July 25.76 UT: m1=13.2, Dia.=1.2’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse with slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 July 24.74 UT: m1=13.6, Dia.=0.7’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Difficult, close to pairing of stars. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 July 05.77 UT: m1=13.3, Dia.=0.8’, DC=6, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Post outburst. Does not enhance in Swan Band filter. Stellar central condensation. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 July 02.06 UT: m1=12.2, Dia.=1.8′, DC=3/, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, ...  Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In outburst. Starlike central condensation. The observed coma is the result of the recent previous minor outbursts. Comparison stars taken from APASS photometry. Field stars checked in DSS. Sidgwick method. SQM: 21.4]
2017 June 30.65 UT: m1=12.4, Dia.=1.7’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Post outburst. Coma weakly condensed and opaque at centre, diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 June 26.52 UT: m1=13.5, Dia.=0.8’, DC=1/2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, faint. Low altitude = 16.6°. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 June 22.75 UT: m1=13.5, Dia.=1’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Diffuse patch of light, slightly brighter in centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 May  29.75 UT: m1=13.3, Dia.=1.1’, DC=2, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 May  06.76 UT: m1=13.5, Dia.=1’, DC=2/3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slightly brighter and weakly condensed centre. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 May  04.76 UT: m1=12.5, Dia.=1.2′, DC=1, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Apr. 28.74 UT: m1=13.6, Dia.=0.5’, DC=5/6, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Coma appears circular and diffuse, opaque at the centre with a faint and sometimes stellar central condensation. Post outburst. Comparison stars checked using APASS data in Guide 9.0, ...  Method= M, ...  Cat= AQ]
2017 Apr. 28.15 UT: m1=13.1, Dia.=0.4′, DC=7, ...  20-cm SCT (133x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, ...  Alt. 1530 m, 42º 54′ N, 5º 48′ W) [In outburst. Comparison stars taken from APASS photometry. Field stars checked in DSS. In-focus method. Tycho-2 comparison stars. Altitude: 11 deg. SQM : 21.4 at zenith. Mountain location, very clear sky]
2017 Apr. 05.75 UT: m1=[14.9, ...  25-cm L f:5 (166x) ...  Chris Wyatt (Walcha, NSW, Australia) [Not visible, ...  Limiting magnitude 14.9. Comparison stars checked using APASS data in Guide 9.0, ...  Method= I, ...  Cat= AQ]
2017 Mar. 27.74 UT: m1=[14.4, negative, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Limiting magnitude = 14.7. Comparison stars checked using APASS data in Guide 9.0, ...  Method= I, ...  Cat= AQ]

24P/Schaumasse
2017 Dec. 23.69 UT: m1=12.2, Dia.=1.8’, DC=2/3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 9.6°, Coma diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2017 Dec. 20.20 UT: m1=10.0, Dia.=4′, DC=2, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2017 Dec. 18.81 UT: m1=12.0, Dia.=2.1′, DC=3, ...  40.0-cm L f/4.5 (75x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Dec. 16.20 UT: m1=11.6, Dia.=3′, DC=2, no tail, ...  20-cm SCT (80x) ...  Carlos Labordena (Castellón, España)
2017 Nov. 26.24 UT: m1=10.1, Dia.=5′, DC=2, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Altitude: 35 deg. Zodiacal light. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2017 Nov. 24.79 UT: m1=11.5, Dia.=1.4′, DC=1, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Nov. 16.21 UT: m1=9.7, Dia.=6′, DC=2/, ...  25×100 B ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Altitude: 29 deg. Zodiacal light. In 20 cm SCT (77x): m1=9.9, Dia.=5′, DC=2/. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2017 Nov. 14.24 UT: m1=10.1, Dia.=5′, DC=2/, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, Alt. 1490 m, 42º 54′ N, 5º 48′ W) [Altitude: 37 deg. Slight moonlight interference. Sidgwick method. Tycho-2 comparison stars. SQM: 20.6]
2017 Nov. 01.16 UT: m1=10.4:, Dia.=2.5′, DC=2-3, ...  0.15-m R f/5 (85x) ...  Gabor Santa (Göd, Hungary) [not easy to see, but obvious, round, diffuse, with some condensation, very similar to 62P. 34 degs above horizon, nelm=4-4.5]
2017 Oct. 30.73 UT: m1=12.5, Dia.=1.8’, DC=3/4, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 10.4°, Twilight interference. Does not enhance in Swan Band filter. Diffuse coma, centre appears slightly brighter in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Oct. 26.80 UT: m1=12.8, Dia.=1.2′, DC=1, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Gunma, Japan)
2017 Oct. 23.20 UT: m1=10.6, Dia.=4′, DC=3, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain, Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 33 deg. Zodiacal light. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2017 Oct. 03.15 UT: m1=10.9, Dia.=4′, DC=2/, ...  20-cm SCT (100x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Obvious motion checked over a 15-min period. Field stars checked in DSS. Altitude: 24 deg. Zodiacal light. Sidgwick method. Tycho-2 comparison stars. SQM : 21.0]
2017 Sep. 25.76 UT: m1=[12.2, ...  40.0-cm L f/4.5 (257x) ...  Seiichi Yoshida (Gunma, Japan)

2P/Encke
2017 Apr. 28.76 UT: m1=12.3, Dia.=1.4’, DC=3, ...  25-cm L f:5 (83x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, does not enhance in Swan Band filter. Interference by Zodiacal light. Comparison stars checked using APASS data in Guide 9.0, ...  Method= S, ...  Cat= AQ]
2017 Apr. 05.76 UT: m1=9.8, Dia.=4.3’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Coma enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2017 Apr. 01.87 UT: m1=9.6, Dia.=4.5′, DC=3, ...  10-cm f/4 L (20x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 31.87 UT: m1=9.6, Dia.=3.5′, DC=3/, ...  20-cm f/4 L (45x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 30.36 UT: m1=8.9:, Dia.=2′, DC=3, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Civil twilght / sun altitude: -11º]
2017 Mar. 27.76 UT: m1=9.1, Dia=1.6’, DC=5/6, ...  25-cm L f:5 (39x) ...  Chris Wyatt (Walcha, NSW, Australia) [Enhances well in Swan Band filter, Coma small with opaque centre, aqua-blue in colour. Slight zodiacal light interference, ...  Low altitude = 10.1°. Comparison stars checked using Tycho-2 data in Guide 9.0, ...  Method= M, ...  Cat= TK]
2017 Mar. 26.35 UT: m1=7.7, Dia.=2′, DC=6, ...  9.0-cm R f/5.5 (33x) ...  Willian Souza (Sao Paulo, Brazil)
2017 Mar. 25.79 UT: m1=8.0, Dia.=2’, DC=7, ...  25×100 B ...  Michael Mattiazzo (Swan Hill, Vic, Australia) [low altitude, moonlight]
2017 Mar. 25.35 UT: m1=7.4, Dia.=3′, DC=3, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilight, Sun altitude: -13 º and Comet altitude: 16º]
2017 Mar. 24.87 UT: m1=7.9, Dia.=4′, DC=6, ...  10-cm f/4 L (20x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 24.35 UT: m1=7.2, Dia.= 3′, DC= 3, ...  20×100 B ...  Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilight, Sun altitude: -13 º and Comet altitude: 14º]
2017 Feb. 24.83 UT: m1=8.4, Dia.=2.0′, DC=7, ...  10×50 B ...  Juan Jose Gonzalez (Villasecino, Leon, Spain, ...  Alt. 1220 m, 42º 58′ N, 6º 01′ W) [Morris method. Tycho-2 comparison stars. SQM : 21.3 at zenith. Altitude: 8 deg. Zodiacal light. Mountain location, very clear sky. In 25x100B: m1=8.8]
2017 Feb. 22.83 UT: m1=8.4, Dia.=2.0′, DC=7, ...  10×50 B ...  Juan Jose Gonzalez (Alto de la Colladona, Asturias, Spain, Alt.910 m, 43º 11′ N, 5º 37′ W) [Morris method. Tycho-2 comparison stars. SQM : 21.1 at zenith. Altitude: 11 deg. Zodiacal light. Mountain location, very clear sky. In 25x100B : m1=8.7]
2017 Feb. 19.77 UT: m1=8.9, Dia.=2.2′, DC=6, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.) [Low altitude: 10.9 deg. above the horizon. Correction for an atmospheric extinction not needed]
2017 Feb. 17.79 UT: m1=9.6, Dia.=3′, DC=5, no tail, ...  20-cm SCT (50x) ...  Carlos Labordena (Castellón, España)
2017 Feb. 17.67 UT: m1=9.0, Dia.=3′, DC=3/, ...  25-cm (48x) ...  Danil Sidorko (Korenovsk, Russia) [easy comet to view]
2017 Feb. 16.82 UT: m1=9.2, Dia.=3′, DC=5, ...  25×100 B ...  Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain, Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Morris method. Tycho-2 comparison stars. SQM : 21.4 at zenith. Altitude: 16 deg. Mountain location, very clear sky]
2017 Feb. 16.75 UT: m1=8.8, Dia.=4.8′, DC=3, ...  20×100 B ...  Martin Lehky (Czech Republic)
2017 Feb. 16.67 UT: m1=8.8, Dia.=3.5′, DC=3/, ...  25-cm (48x) ...  Danil Sidorko (Korenovsk, Russia) [easy comet to view]
2017 Feb. 15.77 UT: m1=9.7, Día.=2.5′, DC=1, ...  35.6-cm T f:11 (78x) ...  Alex Scholten (Bussloo, Netherlands)
2017 Feb. 15.76 UT: m1=9.2, Dia.=3′, DC=4, ...  15.2-cm R f:5 (38x) ...  Maik Meyer (Limburg, Germany)
2017 Feb. 15.75 UT: m1=9.3, Dia.=2.5′, DC=5, ...  33-cm L (67x) ...  Piotr Guzik (Koskowa Góra, Poland, Alt. 800 m, 49° 45′ N, 19º 47′ E) [Morris method used. Bright, moderately condensed, slightly assymetric coma. Deep in bright zodiacal light. Excellent transparency. Relatively easy to see in 10×50 binoculars: m1=9.0, Dia.=&4′, DC=4. SQM: 20.8 at zenith]
2017 Feb. 15.75 UT: m1=9.5, Dia.=2.3′, DC=4, ...  20×80 B ...  Marek Biely (Brno, Czech Republic, 244 m.a.s.l.) [Low altitude: 17.4 deg. above the horizon. Correction for an atmospheric extinction not needed]
2017 Feb. 15.74 UT: m1=9.0, Dia.=5′, DC=3/, ...  20×100 B ...  Martin Lehky (Czech Republic)
2017 Feb. 15.71 UT: m1=9.0, Dia=3′, DC=4, ...  23.5-cm T (115x) ...  Alexsandr Morozov (Novozybkov, Russia)
2017 Feb. 14.75 UT: m1=9.5, Dia.=2.5′, DC=5, ...  33-cm L (67x) ...  Piotr Guzik (Koskowa Góra, Poland, Alt. 800 m, 49° 45′ N, 19º 47′ E) [Morris method used. Bright, moderately condensed, slightly assymetric coma. Deep in bright zodiacal light. I could also barely glimpse it in 10×50 binoculars. SQM: 20.7 at zenith]
2017 Feb. 14.74 UT: m1=9.2, Dia.=5′, DC=3/, ...  20×100 B ...  Martin Lehky (Czech Republic)
2017 Feb. 14.73 UT: m1=8.8, Dia.=2′, DC=2, ...  15.3-cm R (83x) ...  Gabor Santa (Göd, county Pest, Hungary) [Nelm: 3-4, 21 deg above horizon]
2017 Feb. 13.75 UT: m1=10.0, Dia.=2.5′, DC=6, ...  32.0-cm L f:5 (80x) ...  Uwe Pilz (Leipzig, Germany)
2017 Feb. 13.74 UT: m1=9.2, Dia.=5′, DC=3/, ...  20×100 B ...  Martin Lehky (Czech Republic)
2017 Jan. 24.39 UT: m1=12.2, Dia.=1.7′, DC=1/, ...  40.0-cm L f/4.5 (144x) ...  Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 23.75 UT: m1=11.3, Dia.=3′, DC=2, ...  33-cm L (67x) ...  Piotr Guzik (Koskowa Góra, Poland, ...  Alt. 800 m, 49º 45′ N, 19º 47′ E) [Sidgwick method used. Large and diffuse but relatively easy to see. Zodiacal light interference. SQM: 20.8 at zenith]
2017 Jan. 19.79 UT: m1=11.1, Dia.=4′, DC=1/, ...  20-cm SCT (77x) ...  Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, Alt. 1470 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM: 21.3 at zenith. Zodiacal light. Mountain location, very clear sky]
2017 Jan. 01.78 UT: m1=12.8, Dia.=3′, DC=1, ...  30.5-cm L f/4,9 (97x) ...  J. P. Navarro Pina (Campos del Rio, Murcia, Spain) [Sidgwick method, Tycho-2 stellar catalogue]
2017 Jan. 01.72 UT: m1=12.7, Dia.=3.5′, ...  32-cm reflector ...  Uwe Pilz (Leipzig, Germany)

1163
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