71P/Clark

71P/Clark
Reported observations:
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=5/6, ... 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  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]
2012 July 31.29 UT: m1=16.5, DC=3, ... Visual 36″ F/3.5 ... Jean-François Viens (Centre d’Observation Astronomique des Monts Notre-Dame, Québec, Canada)
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