C/2017 O1 (ASASSN)

C/2017 O1 (ASASSN)
Reported observations:
2018 Jan. 17.83 UT: m1=11.5, Dia.=3', DC=2, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1350 m, 42º 54' N, 5º 50' W) [Sidgwick method. APASS comparison stars. SQM: 21.1]
2018 Jan. 07.77 UT: m1=10.0, Dia=2',DC=2, ... 11.4-cm L f/6 (45x) ... Neil Norman FRAS (Ipswich, England)
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. 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=9.6, 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, ... 25x100B ... 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=9.2, 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/, ... 25x100 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 UT: m1=9.4, Dia.=5', DC=2, ... 29x100 B ... Maik Mayer (Liumburg, Germany)
2017 Oct. 27.96 UT: m1=8.8, Dia.=8-9', DC=d2-3, ... 15x70 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/, ... 25x100 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 UT m1=8.6, dia.=6', DC=2/, ... 25x100 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', .. 25x100 B ... Mieczyslaw Leszek Paradowski (Jabłonna, Poland)
2017 Oct. 16.81 UT m1=8.6, dia.=6', DC=2/, ... 25x100 B ... Martin Lehky (Czech Republic)
2017 Oct. 15.81 UT m1=8.5, dia.=7', DC=3, ... 25x100 B ... Martin Lehky (Czech Republic)
2017 Oct. 14.00 UT: m1=8.3, Dia.=7', DC=2/, ... 25x100 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 UT m1=8.6, dia.=7', DC=2/, ... 25x100 B ... Martin Lehky (Czech Republic)
2017 Oct. 12.81 UT m1=8.7, dia.=6.5', DC=2/, ... 25x100 B ... Martin Lehky (Czech Republic)
2017 Oct. 10.90 UT: m1=8.3, Dia.=7', DC=3, ... 25x100 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, ... 10x50 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 UT m1=9.3, dia.=5', DC=3, ... 25x100 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 UT m1=9.6, dia.=5', DC=3/, ... 25x100 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, ... 10x50 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, ... 10x50 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, ... 25x100 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, ... 25x100 B ... Martin Lehky (Hradec Kralove, Czech Republic)
2017 Aug. 29.08 UT: m1=9.5, Dia.=5', DC=3, ... 25x100 B ... Martin Lehky (Hradec Kralove, Czech Republic)
2017 Aug. 25.62: UT: m1=9.6:, ... 25x100 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, ... 25x100 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. 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. 21.11 UT: m1=8.8, Dia.=7', DC=3, ... 25x100 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. 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, ... 25x100 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, ... 25x100 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]
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