185P/Petriew

185P/Petriew
Reported observations:
2018 Mar. 18.41 UT: m1=13.2, Dia.=1.2’, DC=2, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 15.8°; poor seeing. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Mar. 12.42 UT: m1=12.5:, Dia.=1.3', DC=1, ... 40.0-cm L f/4.5 (144x) ... Seiichi Yoshida (Ibaraki, Japan)
2018 Mar. 11.42 UT: m1=12.5, Dia.=1.4’, DC=3, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 13.0°; Does not enhance in Swan Band filter. Slight zodiacal light interference, poor seeing. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ)
2018 Feb. 17.82 UT: m1=10.4, Dia.=3', DC=2/, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Alto de la Garandilla - Escuredo, Leon, Spain; Alt. 1140 m, 42º 42' N, 5º 55' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.6. Altitude: 24 deg. Zodiacal light. Mountain location, very clear sky down to the horizon]
2018 Feb. 10.42 UT: m1=11.7, Dia.=1.7’, DC=3, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 12.0°, zodiacal light interference; Does not enhance in Swan Band filter, opaque centre, weakly condensed. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Feb. 07.42 UT: m1=11.7, Dia.=1.7’, DC=2/3, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 10.1°; Coma diffuse with a slightly brighter but opaque centre. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Feb. 06.42 UT: m1=11.7, Dia.=2.2’, DC=3, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 10.0°; Zodiacal light interference. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Feb. 05.42 UT: m1=12.0, Dia.=1.8’, DC=3, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 11.2°; Does not enhance in Swan Band filter, diffuse coma with slight brightening to centre. Faintly visible at x39. Zodiacal light interference, end of nautical twilight. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Jan. 17.81 UT: m1=10.7, Dia.=2.5', DC=3, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1350 m, 42º 54' N, 5º 50' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8. Motion checked over a 30-min period. Field stars checked in DSS. Altitude: 16 deg. Zodiacal light. Mountain location, very clear sky down to the horizon]
2012 Sep. 22.37 UT: m1=12.8 CCD, Dia.=1.5′... 30.5-cm schmidt-cassegrain ... Jakub Cerny [robotic telescope FRAM in Malargue, Argentina]
2012 Sep. 17.05 UT: m1=12.2:, Dia.=2.2′, DC=2/... 35.6-cm L (133x)... Artyom Novichonok (Shadzhatmaz, Caucasus, Russia) [Bright and vague, zodiacal light]
2012 Sep. 16.04 UT: m1=12.0:, Dia.=2.2′, DC=2/... 35.6-cm L (133x)... Artyom Novichonok (Shadzhatmaz, Caucasus, Russia)
2012 Sep. 15.79 UT: m1=11.5, Dia.=2.4′, DC=3... 40.0-cm L f/4.5 (75x)... Seiichi Yoshida (Gunma, Japan)
2012 Sep. 14.75 UT: m1=11.0, Dia.=2’, DC=2/3... 25-cm L f:5 (83x)... Chris Wyatt (Walcha, NSW, Australia) [No tail, very diffuse coma with weak central condensation, averted vision. Extinction corrected. Method=S. Cat=AQ]
2012 Sep. 14.12 UT: m1=11.5, Dia.=2′... 32-cm reflector... Uwe Pilz (Leipzig, Germany)
2012 Sep. 13.04 UT: m1=12.8:, Dia.=1.8′, DC=3... 35.6-cm L (133x)... Artyom Novichonok (Shadzhatmaz, Caucasus, Russia)
2012 Aug. 26.88 UT, m1=10.7, Dia.=3′, DC=2... 20-cm reflector... Man-To Hui (Luogang, Canton, China) [city lights and twilight. The comet appears very diffuse]
2012 Aug. 24.79 UT: m1=10.5, Dia.= 2.8’, DC=2/3... 25-cm L f:5 (83x)... Chris Wyatt (Walcha, NSW, Australia) [No tail, slight interference by zodiacal light and Venus. Method=S. Cat=AQ]
2012 Aug. 24.33 UT: m1=12.4 CCD, Dia.=0.6’, Tail= 0.6′ PA: 278°... Measures taken on CCD images... Pierre Laporte (Centre d’Observation Astronomique des Monts Notre-Dame, Québec, Canada)
2012 Aug. 22.15 UT: m1=9.7, Dia.=5′, DC=2... 20-cm SCT (77x)... Juan José González (Alto del Castro – Aralla, alt. 1720 m, León, España) [Varias estrellas en la coma, siendo la más brillante de magnitud 12.0 (Tycho-2)].
2012 Aug. 19.80 UT: m1=11.2, Dia.=3’, DC= 2... 25-cm L f:5 (39x)... Chris Wyatt Walcha, NSW, Australia] [No tail, coma diffuse, slight haze in local atmosphere. Method= S. Cat= TK]
2012 Aug. 19.75 UT: m1=10.1, Dia.=3.6′, DC=4... 40.0-cm L f/4.5 (75x)... Seiichi Yoshida (Gunma, Japan)
2012 Aug. 18.40 UT: m1=11.9, Dia.=0.8′, 30.5-cm schmidt-cassegrain... Jakub Cerny (Czech Republic) [robotic telescope FRAM in Malargue, Argentina]
2012 Aug. 18.14 UT: m1=11.3, Dia.=2′, DC=4, no tail... 23.5-cm SCT(94x)... Carlos Labordena (Castellón, España)
2012 Aug. 17.79 UT: m1=10.8, Dia.=2.2’, DC=2... 25-cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [No tail, coma appears large and diffuse, gradually increasing brightness to centre with a broad patch of light, enhances using Swan Band filter. Method= S. Cat= AQ]
2012 July 31.33 UT: m1=11.5, DC=3... Visual 36″ F/3.5... Jean-François Viens (Centre d’Observation Astronomique des Monts Notre-Dame, Québec, Canada)
2012 July 28.31 UT: m1=11.0, DC=4... Visual 36″ F/3.5... Jean-François Viens (Centre d’Observation Astronomique des Monts Notre-Dame, Québec, Canada)
2012 July 28.41 UT: m1=11.7 CCD, Dia.=1.6′... 30.5-cm schmidt-cassegrain + CCD... Jakub Cerny [remotly FRAM Malargue, Argentina]
2012 July 28.36 UT: m1=11.0 (S), Dia.=2′, DC=3... 22-cm L (160x)... Marco Goiato (Araçatuba, Brasil)
2012 July 27.41 UT: m1=12.1 CCD, Dia.=1′.6... 30.5-cm schmidt-cassegrain + CCD... Jakub Cerny [remotly FRAM Malargue, Argentina]
2012 July 23.13 UT: m1=10.4, Dia.=3.5′, DC=2/... 20-cm SCT (77x)... Juan José González (Alto del Castro – Aralla, alt. 1720 m, León, España) [Mejores condiciones atmosféricas de observación permitieron realizar una estimación más brillante que la obtenida hace seis días]
2012 July 21.35 UT: m1=11.3 (S), Dia.=1.5′, DC=4... 22-cm L (160x)... Marco Goiato (Araçatuba, Brasil)
2012 July 19.04 UT: m1=13.5, Dia.=0′.9, DC=4... 35-cm reflector (117x)... Jakub Cerny (Korcula Island, Croatia)
2012 July 17.13 UT: m1=11.0, Dia.=2.5′, DC=2... 20-cm SCT (100x)... Juan José González (Pandorado, 1190 m alt., León, España)
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