45P/Honda-Mrkos-Pajdusakova

45P/Honda-Mrkos-Pajdusakova
Reported observations:
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: m2=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: m2=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, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Mar. 01.96 UT: m1=9.8, Dia.=7x20', 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, ... 25x100 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/, ... 20x100 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, ... 10x50 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., ... 10x50 B ... Piotr Guzik (Teodorów, Poland, Alt. 287 m, 50º 27' N, 20º 18' E) [Sidgwick method used. Still relatively easy to see in 10x50 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', ... 20x80 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, ... 10x50 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. 24.89 UT: m1=8.1, Dia.=14', DC=2, ... 20x80 B ... Neil Norman (Ipswich, Suffolk, England)
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. 23.96 UT: m1=7.5, Dia.=20x30', DC=0-1, ... 15x70 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, ... 20x80 B ... Neil Norman (Ipswich, Suffolk, England)
2017 Feb. 23.64 UT: m1=8.0, Dia.=22.1’, DC=1, ... 7x50 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, ... 10x50 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, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Feb. 21.22 UT: m1=7.8, Dia.=12', DC=2, ... 10x50 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, ... 7x50 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, ... 10x50 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: m2=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/, ... 25x100 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, ... 20x80 B ... Neil Norman (Ipswich, Suffolk, England)
2017 Feb. 15.88 UT: m1=8.9, Dia.=15', DC=0/, ... 20x80 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, ... 10x50 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, ... 25x100 B ... Martin Lehky (Czech Republic)
2017 Feb. 14.84 UT: m2=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, ... 6x40 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, ... 10x70R... 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. 05.77 UT: m1=6.3, Dia.=3.2′, DC=4/, ... 20×60 B... José J. Chambó (Benali, Valencia, España)
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. 05.75 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)
2016 Dec. 31.77 UT: m1=6.9, Dia.=2.5′, DC=7, ... 10×50 B... Juan Jose Gonzalez (Linares – Proaza, Asturias, Spain; Alt. 843 m, 43º 16′ N, 6º 02′ W) [Altitude: 10 deg. Morris Method. Tycho-2 comparison stars at the same low altitude as the comet. SQM: 21.1 at zenith. Zodiacal light. Mountain location, very clear sky]
2016 Dec. 31.76 UT: m1=7.6, Dia.=6′, DC=3, ... 20×80 B... J. P. Navarro Pina (El Palmar, Murcia, Spain) [Sidgwick method, comet low altitude, tycho-2 stellar catalogue]
2016 Dec. 31.70 UT: m1=7.1, Dia.=2.6′, DC=6/, Tail= 0.67 deg. in PA: 80 deg ... 25×100 B... Jakub Cerny (Senohraby, Czech Republic)
2016 Dec. 31.45 UT: m1=7.2, ... 25×100 B... David A. J. Seargent (Cowra, NSW, Australia)
2016 Dec. 30.77 UT: m1=7.0, Dia.=2.5′, DC=7, ... 10×50 B... Juan Jose Gonzalez (Collado del Fresno – Sierra del Aramo, Asturias, Spain... Alt. 1240 m, 43º 10′ N, 5º 54′ W) [Altitude: 10 deg. Morris Method. Tycho-2 comparison stars at the same low altitude as the comet. SQM: 21.1 at zenith. Zodiacal light. Mountain location, very clear sky]
2016 Dec. 30.43 UT: m1=7.2, Dia.=2.2’, DC=5/, ... 25-cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 7.7°... Enhances well in Swan Band filter, faint Tail traced to 13.5’ in length in P.A. 085° approximately. Faint outer coma, brightening to an opaque inner coma, aqua-blue in colour with a small stellar central condensation. Slight interference by twilight. Comparison stars checked using Tycho-2 data in Guide 9.0. Method= M. Cat= TK]
2016 Dec. 29.97 UT: m1=7.4, Dia.=3′, DC=4/, ... 11X80 B... José G. de S. Aguiar (Campinas, Brasil)
2016 Dec. 29.96 UT: m1=7.2, Dia.=5′, DC=5/, Tail= 0.1º in PA: 75 deg ... 20X100 B... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical Twilight, Sun altitude: -12º /Comet altitude: 15º]
2016 Dec. 29.77 UT: m1=7.1, Dia.=2.5′, DC=7, ... 10×50 B... Juan Jose Gonzalez (Salcedo – Sierra del Aramo, Asturias, Spain... Alt. 1140 m, 43º 11′ N, 5º 57′ W) [Altitude: 10 deg. Morris Method. Tycho-2 comparison stars at the same low altitude as the comet. SQM: 21.1 at zenith. Zodiacal light. Mountain location, very clear sky]
2016 Dec. 29.74 UT: m1=7.5, Dia.=8′, DC=6, ... 20×80 B... J. P. Navarro Pina (Sangonera la Verde, Murcia, Spain) [Sidgwick method, comet low altitude, tycho-2 stellar catalogue]
2016 Dec. 29.69 UT: m1=7.2, Dia.=3.5’, DC=D7, ... 15×70 B & 25-cm L (92x)... Gabor Santa (Göd, Pest county, Hungary) [Tail: 8-9’ to PA 80. Coma has very strong green colour in the newtonian telescope. Nelm at the comet: 4m]
2016 Dec. 29.69 UT: m1=7.3, Dia.=2.2’, DC=6, ... 25-cm L (31x)... Sandor Szabo (Hungary) [Tail: 10’ to 75-80 deg.]
2016 Dec. 29.43 UT: m1=7.4, Dia.=2.2’, DC=5/, ... 25-cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 6.7°... Faint Tail visible, just above background threshold, traced to 14.5’in P.A. 079° approximately. Faint stellar central condensation visible in good seeing, opaque inner coma, aqua-blue in colour and enhances well in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0. Method= M. Cat= TK]
2016 Dec. 28.95 UT: m1=7.3, Dia= 3′, DC=5, ... 15×70 B... Willian Souza (Sao Paulo, Brazil)
2016 Dec. 28.77 UT: m1=7.2, Dia.=3′, DC=7, ... 10×50 B... Juan Jose Gonzalez (Gamoniteiro – Sierra del Aramo, Asturias, Spain... Alt. 1710 m, 43º 11′ N, 5º 55′ W) [In 25x100B: m1=7.5. Altitude: 10 deg. Morris Method. Tycho-2 comparison stars at the same low altitude as the comet. SQM: 20.9 at zenith. Zodiacal light. Mountain location, very clear sky]
2016 Dec. 28.77 UT: m1=7.9, Dia=3′, DC=6, Tail= 8′, ... 15-cm T (44x)... Carlos Labordena (Castellón, España)
2016 Dec. 28.76 UT: m1=7.8, Dia=2.5′, DC=6, no tail, ... 8-cm B (11x)... Carlos Labordena (Castellón, España)
2016 Dec. 28.69 UT: m1=7.3, Dia.=2′, DC=7/, ... 20×80 B & 10-cm R (55x)... Gabor Santa (Göd, Pest county, Hungary) [Tail= 4′ to PA: 80]
2016 Dec. 27.43 UT: m1=7.5, Dia.=2′, DC=6, ... 25-cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, brightening to a well condensed centre, aqua-blue in colour. Enhances strongly in Swan Band filter. Faint Tail traced to 13’ in P.A.: 078° approximately. Low altitude= 7.3°, slight interference by zodiacal light. Comparison stars checked using Tycho-2 data in Guide 9.0. Method= M. Cat= TK]
2016 Dec. 26.96 UT: m1=7.6, Dia.=3′, DC=5, ... 25X100 B... José G. de S. Aguiar (Campinas, Brasil)
2016 Dec. 26.96 UT: m1=7.3, Dia.=3′, DC=4/, ... 7X50 B... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical Twilight, Sun altitude: -12 º /Comet altitude: 17 º]
2016 Dec. 26.77 UT: m1=7.3, Dia.=4′, DC=6/, ... 10×50 B... Juan José González (Alto del Castro, alt. 1720 m, León, España... Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Método Morris. Estrellas de comparación Tycho-2 situadas a la misma altitud (9º) que el cometa. SQM zenital: 21.2. En 20-cm SCT (77x): Condensación central cuasi-estelar: m2=9.5:(Tycho-2), Tail= 1.6º en AP 80º. Luz zodiacal. Cielo muy claro de montaña]
2016 Dec. 25.97 UT: m1=7.8, Dia.=3′, DC=5, ... 25X100 B... José G. de S. Aguiar (Campinas, Brasil)
2016 Dec. 25.46 UT: m1=7.0, ... 25×100 B... David A. J. Seargent (Cowra, NSW, Australia) [Moderately enhanced through Swan band filter. Very low elevation. Magnitude estimate rather approximate]
2016 Dec. 23.96 UT: m1=8.4, Dia.=3′, DC=4/, ... 25X100 B... José G. de S. Aguiar (Campinas, Brasil)
2016 Dec. 23.76 UT: m1=8.2, Dia.=4.0′, DC=6, ... 20X80 B... J. P. Navarro Pina (El Palmar, Murcia, Spain) [Altitude 10º]
2016 Dec. 23.76 UT: m1=8.6, Dia=3′, DC=6, Tail= 5′, ... 15-cm T (25x)... Carlos Labordena (Castellón, España)
2016 Dec. 23.75 UT: m1=8.4, Dia=2.5′, DC=5, no tail, ... 8-cm B (11x)... Carlos Labordena (Castellón, España)
2016 Dec. 22.75 UT: m1=8.3, Dia.=3.5′, DC=9, ... 30.5-cm L f/4,9 (47x)... J. P. Navarro Pina (Campos del Rio, Murcia, Spain) [Very condensed, Lm=6.0, Beyer’s method, stellar catalog Tycho-2]
2016 Dec. 22.68 UT: m1=8.1, Dia.=3′, DC=6, ... 33-cm L (50x)... Piotr Guzik (Koskowa Góra, Poland; Alt. 800 m, 49º 45′ N, 19º 47′ E) [Morris method used, comparison stars at the same low altitude as the comet. Very bright, greenish colour obvious in telescope. SQM: 20.9 at zenith]
2016 Dec. 22.68 UT: m1=7.8, Dia.=4′, DC=7, ... 10×50 B... Piotr Guzik (Koskowa Góra, Poland; Alt. 800 m, 49º 45′ N, 19º 47′ E) [Morris method used, comparison stars at the same low altitude as the comet. Comet easily seen in 10×50 binoculars thanks to exceptional transparency. SQM: 20.9 at zenith]
2016 Dec. 22.43 UT: m1=8.2, Dia.=1.8’, DC=6, ... 25-cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse and appears slightly elongated to the ENE approximately, brightening to a compact centre with a faint stellar central condensation. Low altitude = 9.0°. Windy conditions, interference by cloud blowing through from the East. Comparison stars checked using Tycho-2 data in Guide 9.0. Method= M. Cat= TK]
2016 Dec. 22.01 UT: m1=8.4, Dia.=2.5′, DC=5, ... 25-cm L f:4.5 (66x)... Gonzalo Vargas (Cochabamba Bolivia) [La coma aparece más densa en el centro sin llegar a ser de tipo estelar, se aprecia el color verde agua, utilice un filtro SkyGlow que me permitió apreciar la coma con más detalle evitando la dispersión atmosférica de la luz de la lejanía del centro de la ciudad]
2016 Dec. 20.43 UT: m1=8.1, Dia.=2.4’, DC=6, ... 25-cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Coma shows a faint stellar central condensation, inner coma aqua-blue in colour and opaque, fading to edges. Enhances strongly in Swan Band filter. Slight interference by zodiacal light. Low altitude= 10.4°]
2016 Dec. 17.96 UT: m1=8.7, Dia.=2.5′, DC=5, ... 20X100 B... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical Twilight]
2016 Dec. 17.77 UT: m1=8.5, Dia.=2′, DC=6, ... 25×100 B... Juan José González (Alto del Trichero – Soto y Amío, Alt. 1190 m, 42º 46′ N, 5º 53′ W, León, España) [En 20-cm SCT (77x): m1=8.7, Dia.=2.5′, DC=5/, Cola= 0.15º en AP: 80º. altura sobre el horizonte: 10º. Estimado con el método Morris. Estrellas de comparación Tycho-2 situadas a la misma altitud que el cometa. SQM zenital: 21.3. Cielo muy claro de montaña]
2016 Dec. 17.43 UT: m1=8.6, Dia.=1.5’, DC=6, ... 25-cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Coma well condensed, opaque in centre with small star-like central condensation, aqua-blue in colour. Enhances strongly in Swan Band filter. Low altitude = 12.2°]
2016 Dec. 17.01 UT: m1=9.2, Dia.=1.6′, DC=3, ... 25-cm L f/4.5 (66x)... Gonzalo Vargas (Cochabamba, Bolivia)
2016 Dec. 12.74 UT: m1=10.4, Dia.=1.6′, DC=3, ... 30.5-cm L f/4,9 (94x)... J. P. Navarro Pina (Campos del Rio, Murcia, Spain) [Full moon 115º dist., Beyer Method’s]
2016 Dec. 03.36 UT: m1=11.0, Dia.=1.7′, DC=2, ... 40.0-cm L f/4.5 (144x)... Seiichi Yoshida (Gunma, Japan)
2016 Dec. 04.43 UT: m1=11.1, Dia.=1.5’, DC=3, ... 25-cm L f:5 (83x)... Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, brightening slightly to and opaque centre, weakly condensed. Pale blue in colour. Low altitude = 12.7°. Moonlight interference]
2016 Dec. 01.43 UT: m1=11.2, Dia.=1.5’, DC=2, ... 25-cm L f:5 (83x)... Chris Wyatt (Walcha, NSW, Australia) [Coma enhances in Swan Band filter. Coma diffuse with slight brightening to centre, pale aqua-blue in colour. Slight twilight/zodiacal light interference. Low altitude = 14.9°]
2011 Dec. 07.23 UT: m1=10.5, Dia.=3′, DC=2/, ... 20-cm SCT (100x)... Juan José González (Alto del Castro – Aralla, alt. 1720 m., León, España) [Luz zodiacal]
2011 Nov. 25.83 UT: m1=13.5, Dia.=0.6′, DC=2, ... 40.0-cm L f/4.5 (257x)... Seiichi Yoshida (Gunma, Japan)
2011 Nov. 08.22 UT: m1=9.5, Dia.=5′, DC=3, Tail= 0.4º en PA: 290º... 20-cm SCT (77x)... Juan José González (El Fito – Sierra del Sueve, alt. 570 m., Asturias, España) [Varias estrellas en la coma, la más brillante de mag. 11.6 (Tycho-2). Luz zodiacal. Altura sobre el horizonte: 22º]
2011 Nov. 01.48 UT: m1=11.0, Dia.=4´, DC=4, Tail: not visible, ... 25-cm Reflector (48x)... Salvador Aguirre (Hermosillo, Sonora, Mexico)
2011 Oct. 30.19 UT: m1=9.2, Dia.=3.5′, DC=3/, Tail= 0.2º en PA: 290º, ... 20-cm SCT (77x)... Juan José González (Alto del Castro – Aralla, alt. 1720 m., León, España) [Luz zodiacal. Altura sobre el horizonte: 10º. Cielo muy claro de montaña]
2011 Oct. 09.22 UT: m1=7.5, Dia.=4′, DC=7/, ... 10×50 B... Juan José González (Alto del Castro – Aralla, alt. 1720 m., León, España) [En 20-cm SCT (77x): Cola de 1.9º en AP 300º. Altura sobre el horizonte: 19º. Luz zodiacal. Crepúsculo astronómico. Cielo muy claro de montaña]
2011 Oct. 08.81 UT: m1=8.0, Dia.=3.5′, DC=7/, ... 40-cm L f/4.5 (36x)... Seiichi Yoshida (Gunma, Japan)
2011 Oct. 07.80 UT: m1=8.0, Dia.=1.9′, DC=8, ... 40-cm L f/4.5 (36x)... Seiichi Yoshida (Gunma, Japan)
2011 Oct. 07.333 UT: m1=7.6, Dia.=4′, DC=5/, ... 20×100 B... Marco Goiato (Araçatuba, Brasil) [cometa a 10º de altura, crepúsculo náutico]
2011 Oct. 04.333 UT: m1=7.3, Dia.=4′, DC=6, ... 20×100 B... Marco Goiato (Araçatuba, Brasil) [cometa a 9º de altura]
2011 Oct. 01.21 UT: m1=7.2, Dia.=4′, DC=7, Tail= 0.6º en PA: 290º... 25×100 B... Juan José González (Alto del Castro – Aralla, alt. 1720 m., León, España) [Luz zodiacal. Altura sobre el horizonte: 16º. Una menor transparencia atmosférica a baja altura no permitió observar mayor longitud de cola]
2011 Sep. 25.18 UT: m1=6.6, Dia.=5′, DC=6, ... 10×50 B... Juan José González (Alto del Castro – Aralla, alt. 1720 m., León, España) [En 20-cm SCT (77x): Cola de 0.6º en AP 280º. Altura sobre el horizonte: 9º. Estrellas de comparación a la misma altura que el cometa. Alguna interferencia de la cercana Luna (fase 0.07). Luz zodiacal. Cielo muy claro de montaña]
2011 Aug. 14.36 UT: m1=8.0, Dia.=3′, DC=3, ... 20×80 B... Willian Souza (Sao Paulo, Brazil) [Moon ~12 deg high]
2011 Aug. 13.36 UT: m1=8.1, Dia.=3′, DC=3, ... 20×80 B... Willian Souza (Sao Paulo, Brazil) [Moon ~3 deg high]
2011 Aug. 11.354 UT: m1=8.9, Dia.=12′, DC=1/, ... 22-cm L f:6.5 (60x)... Marco Goiato (Araçatuba, Brasil) [Pouca ou nenhuma melhora com filtro de cometa]
2011 Aug. 09.146 UT: m1=9.5:, Dia.=7′, DC=2, ... 22-cm L f:6.5 (60x)... Marco Goiato (Araçatuba, Brasil) [Luar]
2011 Aug. 08.07 UT: m1=9.2, Dia.=8′, DC=2/, ... 20-cm SCT (77x)... Juan José González (Pandorado, alt. 1190 m., León, España) [Cielo muy claro de montaña. Estrellas de comparación a la misma baja altura (6º) sobre el horizonte que el cometa]
2011 Aug. 08.05 UT: m1=10.0, ... 18-cm L (57x)... Alexandre Amorim (Florianopolis, Brazil) [moonlight and nebulosity]
2011 Aug. 07.12 UT: m1=10.5:, ... 18-cm L (57x)... Alexandre Amorim (Florianopolis, Brazil) [moonlight and nebulosity]
2011 Aug. 06.04 UT: m1=10.7, Dia=2′, DC=5, ... 18-cm L (57x)... Alexandre Amorim (Florianopolis, Brazil) [moonlight interference]
2011 Aug. 05.14 UT: m1=11.0:, ... 18-cm L (57x)... Alexandre Amorim (Florianopolis, Brazil)
2011 Aug. 04.16 UT: m1=11.5, Dia.=1′, ... 18-cm L (57x)... Alexandre Amorim (Florianopolis, Brazil)
2011 Aug. 04.104 UT: m1=10.9, Dia.=4′, DC=1/, ... 22-cm L f:6.5 (160x)... Marco Goiato (Araçatuba, Brasil)
2011 Aug. 04.08 UT: m1=9.8, Dia.=8′, DC=2/, ... 20-cm SCT (77x)... Juan José González (Alto del Castro – Aralla, alt. 1720 m., León, España) [Cielo muy claro de montaña. Altura sobre el horizonte: 15º]
2011 Aug. 03.75 UT: m1=[9.4, ... 20×80 B... Artyom Novichonok (Nam Cat Tien National Park, Vietnam)
2011 Aug. 03.52 UT: m1=11.0, Dia.=3′, DC=1, ... 20-cm L (67x)... Michael Mattiazzo (Castlemaine, Victoria) [Tycho 2 VT comparison stars. First positive observation. Very diffuse. Good conditions]
2011 Aug. 03.08 UT: m1=11.2:, ... 18-cm L (57x)... Alexandre Amorim (Florianopolis, Brazil)
2011 Aug. 03.06 UT: m1=11.6, Dia.=3′, DC=3, no Tail, ... 23.5-cm SCT(94x)... Carlos Labordena (Castellón, España)
2011 Aug. 02.80 UT: m1=10.6, Dia.=3.4′, DC=2/, ... 20-cm reflector... M.-T. Hui (Canton, China) [city lights]
2011 Aug. 01.80 UT: m1=10.4, Dia.=2′.8, DC=3, ... 20.0-cm L (48x)... M.-T. Hui (Canton, China) [city lights; slight smog; motion noticeable during a spell of 30min]
2011 Aug. 01.10 UT: m1=10.7, Dia.=6′, DC=2/, ... 20-cm SCT (133x)... Juan José González (Alto del Castro – Aralla, alt. 1720 m., León, España) [Cielo muy claro de montaña. Altura sobre el horizonte: 18º]
2011 July 31.02 UT: m1=13.1, Dia.=0.7′, DC=2, ... 51-cm L5 (121x)... José Carvajal (Madrid, España) [Método: S, Cat: NP]
2011 July 30.250 UT: m1=11.8:, Dia.=2′, DC=2, ... 22-cm L f:6.5 (160x)... Marco Goiato (Araçatuba, Brasil) [Nuvens]
2011 July 28.83 UT: m1=12.4:, Dia.=&2′, DC=2, ... 20.0-cm L (48x)... M.-T. Hui (Canton, China) [city lights; suffering from abdominal pain]
2011 July 29.58 UT: m1=13.1, Dia.=1.2’, DC=3/, ... 25-cm L f:5 (83x)... Chris Wyatt (Walcha, NSW, Australia) [Coma small, central condensation slightly brighter but smeared out, faint outer coma, no Tail, averted vision, no enhancement with Swan Band filter. Comp Star= ASAS-3 220024_2707.5. Method= S. Cat= AU]
2011 July 28.04 UT: m1=11.3, Dia.=5′, DC=2/, ... 20-cm SCT (133x)... Juan José González (Alto del Castro – Aralla, alt. 1720 m., León, España) [Cometa significativamente más brillante que lo previsto. Coma de 5′ con débil y difusa región exterior. Observación realizada desde localidad de montaña, con muy buen seeing. Movimiento seguido durante 75 min. Estrellas de campo comprobadas en el DSS. Magnitud límite estelar cerca del cometa: 15.3 (GSC)]
2001 May  19.87 UT: m1=11.7, Dia.=1.9', DC=3, ... 25-cm C... Werner Hasubick (Buchloe, Germany)
2001 May  12.46 UT: m1=11.0, Dia.=1.6', DC=3, ... 25.4-cm T f/6.3 (116x)... Seiichi Yoshida (Ibaraki, Japan)
2001 Apr. 26.84 UT: m1=10.1, Dia.=1.1', DC=4, ... 44-cm L... Werner Hasubick (Buchloe, Germany)
2001 Apr. 23.45 UT: m1=10.0:, Dia.=4', DC=--, ... 32-cm L (91x)... Yoshimi Nagai (Yamanashi, Japan) [DC=unknown, Because comet is just crossing with SAO76623]
2001 Apr. 19.104 UT: m1=9.2, Dia.=2.5', DC=4, ... 37-cm L... Bob King (Duluth, MN) [Low altitude but an easy object. Moderately condensed, circular coma]
2001 Apr. 17.13 UT: m1=9.6, Dia.=2', DC=5/, ... 20-cm SCT... Alan Hale (Cloudcroft, New Mexico) [the comet is relatively easy to see, but there is no sign of the tail that was evident on near-simultaneous CCD images taken with the same instrument]
2001 Apr. 12.12 UT: m1=9.4, Dia.=1.5', DC=7, ... 20-cm L... Alan Hale (Cloudcroft, New Mexico) [despite low elevation and some possible thin cirrus, the comet is surprisingly easy to see, exhibiting a small, "dense" coma]

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