71P/Clark

71P/Clark
2017 May  21.93 UT: m1=[11.0, NEGATIVE, ... 13-cm L (65x) ... Alexsandr Morozov (Novozybkov, Russia) [Lm=6.19]
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)