Recent Comet Brightness Estimates

24P/Schaumasse
Total-magnitude and coma-diameter estimates:
2017 Nov. 17.19, 11.3, 1.6' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector)
2017 Nov. 16.21, 9.7, 6' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Nov. 16.19, 9.9, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Nov. 14.24, 10.1, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Nov. 03.50, 11.4, 9' (T. Lehmann, 0.106-m refractor)
2017 Oct. 30.73, 12.5, 1.8' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 30.15, 12.2, 1' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector)
2017 Oct. 30.13, 11.9, 6.7' (J. Warell, 0.25-m Schmidt-Cassegrain)
2017 Oct. 28.47, [10.5, 2' (C. Hergenrother, 30x125 binoculars)
2017 Oct. 26.80, 12.8, 1.2' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Oct. 25.11, 12.0, 1.5' (C. Harder, Ustrine, Kroatien, 0.3-m Newtonian reflector)
2017 Oct. 23.20, 10.6, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2017 Nov. 14.73, 13.4, 0.5' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Nov. 12.81, 13.5, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Nov. 10.86, 13.4, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Nov. 04.81, 12.9, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Nov. 03.84, 12.7, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 26.38, 12.9, 0.9' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Oct. 25.84, 13.3, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 23.93, 13.4, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 22.88, 11.5, 2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)

47P/Ashbrook-Jackson
Total-magnitude and coma-diameter estimates:
2017 Nov. 14.83, 15.2, 0.15' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Oct. 30.13, 14.3, 3.3' (J. Warell, 0.25-m Schmidt-Cassegrain)

62P/Tsuchinshan
Total-magnitude and coma-diameter estimates:
2017 Nov. 20.48, [10.4, -- (S. Aguirre, Son,Mex., 0.1-m reflector)
2017 Nov. 19.40, 11.0, 2.1' (C. Quesada, Norman, Oklahoma, 0.052-m reflector)
2017 Nov. 17.18, 10.8, 2' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector)
2017 Nov. 16.18, 12.0, 2.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Nov. 16.16, 9.2, 7' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Nov. 16.15, 9.6, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Nov. 14.12, 9.6, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Nov. 03.49, 10.7, 11' (T. Lehmann, 0.106-m refractor)
2017 Nov. 02.16, 10.8, 2.5' (M. Meyer, 0.254-m Newtonian reflector)
2017 Oct. 30.72, 11.0, 3.2' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 30.19, 10.8, 6.7' (J. Warell, 0.25-m Schmidt-Cassegrain)
2017 Oct. 30.18, 10.9, 3' (M. Meyer, 0.254-m Newtonian reflector)
2017 Oct. 30.14, 10.6, 1.5' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector)
2017 Oct. 28.46, [10.5, 2' (C. Hergenrother, 30x125 binoculars)
2017 Oct. 26.77, 11.5, 2.4' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Oct. 26.50, 10.8, 13' (T. Lehmann, 0.106-m refractor)
2017 Oct. 25.09, 10.8, 2' (C. Harder, Ustrine, Kroatien, 0.3-m Newtonian reflector)
2017 Oct. 23.22, 10.2, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)

71P/Clark
Total-magnitude and coma-diameter estimates:
2017 Nov. 12.07, 14.6, 1' (M. Masek, 0.3-m Schmidt-Cassegrain; 0.9' tail in p.a. 87)
2017 Nov. 10.08, 15.5, 0.6' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Nov. 09.48, 14.3, 0.5' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Nov. 07.43, 13.2, 6' (T. Lehmann, 0.4-m Newtonian reflector; 0.07-deg tail in p.a. 269)
2017 Oct. 26.39, 12.7, 0.6' (S. Yoshida, 0.4-m Newtonian reflector)

73P-BT/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2017 Oct. 25.22, 15.0, 0.4' (K. Hills, 0.5-m Newtonian reflector)

90P/Gehrels
Total-magnitude and coma-diameter estimates:
2017 Nov. 14.15, 15.8, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 26.24, 16.5, 0.3' (K. Hills, 0.5-m Newtonian reflector)

96P/Machholz
Total-magnitude and coma-diameter estimates:
2017 Oct. 29.15, 2.5, 20' (M. Paradowski, SOHO LASCO C3, 0.008-m reflector)
2017 Oct. 28.75, 2.3, 22' (M. Paradowski, SOHO LASCO C3, 0.008-m reflector)
2017 Oct. 28.17, 2.1, 23' (M. Paradowski, SOHO LASCO C3, 0.008-m reflector)
2017 Oct. 28.00, 2.0, 23' (M. Paradowski, SOHO LASCO C3, 0.008-m reflector)
2017 Oct. 27.85, 2.2, 22' (M. Paradowski, SOHO LASCO C3, 0.008-m reflector)
2017 Oct. 27.59, 2.3, 19' (M. Paradowski, SOHO LASCO C3, 0.008-m reflector)
2017 Oct. 27.34, 2.4, 19' (M. Paradowski, SOHO LASCO C3, 0.008-m reflector)
2017 Oct. 27.27, 2.5, 19' (M. Paradowski, SOHO LASCO C3, 0.008-m reflector)
2017 Oct. 26.58, 2.6, 19' (M. Paradowski, SOHO LASCO C3, 0.008-m reflector)

139P/Vaisala-Oterma
Total-magnitude and coma-diameter estimates:
2017 Nov. 19.15, 18.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 29.20, 18.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)

145P/Shoemaker-Levy
Total-magnitude and coma-diameter estimates:
2017 Nov. 14.91, 16.0, 0.1' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Nov. 14.14, 13.2, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 30.14, 14.9, 0.9' (J. Warell, 0.25-m Schmidt-Cassegrain)
2017 Oct. 29.24, 12.7, 0.6' (K. Hills, 0.5-m Newtonian reflector)

159P/LONEOS
Total-magnitude and coma-diameter estimates:
2017 Oct. 29.18, 17.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

174P/Echeclus
Total-magnitude and coma-diameter estimates:
2017 Nov. 15.00, 17.0, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Nov. 12.12, 17.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 24.16, 17.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)

176P/LINEAR
Total-magnitude and coma-diameter estimates:
2017 Nov. 15.17, 18.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 29.22, 19.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

188P/LINEAR-Mueller
Total-magnitude and coma-diameter estimates:
2017 Oct. 27.26, 18.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

213P/Van Ness
Total-magnitude and coma-diameter estimates:
2017 Nov. 10.05, 16.6, 0.6' (M. Masek, 0.3-m Schmidt-Cassegrain)

217P/LINEAR
Total-magnitude and coma-diameter estimates:
2017 Nov. 13.24, 13.6, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 30.02, 12.7, 5' (J. Warell, 0.25-m Schmidt-Cassegrain; 2.6' tail in p.a. 276)
2017 Oct. 22.32, 14.8, 1.1' (M. Masek, 0.3-m Schmidt-Cassegrain; 2.0' tail in p.a. 269)

229P/Gibbs
Total-magnitude and coma-diameter estimates:
2017 Nov. 14.12, 18.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 31.21, 18.3, 0.3' (K. Hills, 0.5-m Newtonian reflector)

240P/NEAT
Total-magnitude and coma-diameter estimates:
2017 Nov. 10.10, 15.2, 0.8' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Nov. 08.46, 14.2, 1.2' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 25.95, 13.6, 0.8' (K. Hills, 0.5-m Newtonian reflector)

355P/LINEAR-NEAT
Total-magnitude and coma-diameter estimates:
2017 Nov. 14.19, 14.8, 0.8' (M. Masek, 0.3-m Schmidt-Cassegrain)

C/2010 U3 (Boattini)
Total-magnitude and coma-diameter estimates:
2017 Nov. 14.03, 16.1, 1.9' (S. Fritsche, 0.1-m refractor)
2017 Nov. 13.17, 16.0, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 31.24, 15.5, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 29.97, 15.8, 1.3' (J. Warell, 0.25-m Schmidt-Cassegrain)

C/2011 KP36 (Spacewatch)
Total-magnitude and coma-diameter estimates:
2017 Nov. 13.09, 14.5, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 30.11, 14.6, 2' (J. Warell, 0.25-m Schmidt-Cassegrain; 0.4' tail in p.a. 266)
2017 Oct. 26.17, 14.2, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2013 US10 (Catalina)
Total-magnitude and coma-diameter estimates:
2017 Oct. 24.37, 18.5, 0.3' (C. Hergenrother, 0.51-m Ritchey-Chretien)

C/2015 ER61 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Nov. 14.86, 13.5, 0.9' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Nov. 14.21, 13.4, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2017 Nov. 13.91, 13.3, 6.1' (S. Fritsche, 0.1-m refractor; 0.5-deg tail in p.a. 260)
2017 Nov. 13.88, 13.7, 2.9' (T. Lehmann, 0.2-m Newtonian reflector; 0.75-deg tail in p.a. 261)
2017 Nov. 09.53, 14.0, 3' (T. Lehmann, 0.106-m refractor; 0.5-deg tail in p.a. 261)
2017 Oct. 30.08, 13.4, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 30.00, 12.8, 5.3' (J. Warell, 0.25-m Schmidt-Cassegrain; 11.7' tail in p.a. 262)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 28.83, 13.4, 0.7' (K. Hills, 0.5-m Newtonian reflector)

C/2015 V1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Nov. 14.85, 15.3, 0.3' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Nov. 09.46, 14.2, 0.4' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 29.99, 14.5, 2' (J. Warell, 0.25-m Schmidt-Cassegrain; 1.4' tail in p.a. 29)
2017 Oct. 26.66, [14.4, 0.3' (S. Yoshida, 0.4-m Newtonian reflector)

C/2015 V2 (Johnson)
Total-magnitude and coma-diameter estimates:
2017 Nov. 14.44, 12.2, 5.5' (T. Lehmann, 0.106-m refractor; 0.2-deg tail in p.a. 312)
2017 Nov. 12.04, 12.6, 1.8' (M. Masek, 0.3-m Schmidt-Cassegrain; 12.3' tail in p.a. 297)
2017 Nov. 10.03, 12.5, 1.6' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Nov. 09.47, 12.4, 1.1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Nov. 07.42, 11.9, 7' (T. Lehmann, 0.4-m Newtonian reflector; 0.31-deg tail in p.a. 316)
2017 Oct. 27.41, 11.8, 6' (T. Lehmann, 0.4-m Newtonian reflector; 0.18-deg tail in p.a. 324)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Nov. 14.75, 14.0, 0.5' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Nov. 13.73, 14.5, 1.1' (T. Lehmann, 0.2-m Newtonian reflector; 0.01-deg tail in p.a. 8)
2017 Nov. 12.75, 13.5, 0.6' (C. Harder, Tondern/DK, 0.402-m Newtonian reflector)
2017 Nov. 03.86, 13.1, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Nov. 01.73, 14.8, 1.2' (T. Lehmann, 0.2-m Newtonian reflector)
2017 Oct. 26.40, [13.9, 0.4' (S. Yoshida, 0.4-m Newtonian reflector)

C/2016 N4 (MASTER)
Total-magnitude and coma-diameter estimates:
2017 Oct. 30.16, 15.2, 1.3' (J. Warell, 0.25-m Schmidt-Cassegrain)
2017 Oct. 26.65, 14.5, 0.3' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Oct. 25.87, 15.2, 0.6' (K. Hills, 0.5-m Newtonian reflector)

C/2016 N6 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Nov. 16.23, 13.5, 0.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Oct. 30.82, 14.2, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 30.15, 14.1, 2' (J. Warell, 0.25-m Schmidt-Cassegrain)

C/2016 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Nov. 16.18, 11.7, 1.3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Nov. 14.89, 13.4, 0.4' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Nov. 14.19, 11.8, 1.3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Nov. 14.14, 12.8, 1' (M. Goiato, 0.22-m Newtonian reflector)
2017 Nov. 13.99, 11.7, 6.7' (S. Fritsche, 0.1-m refractor; 0.04-deg tail in p.a. 284)
2017 Nov. 12.98, 12.5, 1' (C. Harder, Tondern/DK, 0.402-m Newtonian reflector)
2017 Nov. 12.14, 11.5, 1.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Nov. 11.98, 12.7, 1.2' (W. Kutschera, 0.51-m Newtonian reflector)
2017 Nov. 09.49, 12.9, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 30.69, 12.8, 2' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 29.97, 11.9, 5.3' (J. Warell, 0.25-m Schmidt-Cassegrain; 1.1' tail in p.a. 246)
2017 Oct. 29.49, 12.6, 4.5' (T. Lehmann, 0.106-m refractor)
2017 Oct. 26.68, 13.2, 0.7' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Oct. 22.44, 13.9, 1.3' (T. Lehmann, 0.51-m Newtonian reflector)

C/2016 T3 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Nov. 19.23, 17.0, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2017 K4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2017 Nov. 12.82, 15.3, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2017 K6 (Jacques)
Total-magnitude and coma-diameter estimates:
2017 Nov. 10.12, 14.8, 0.7' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Nov. 09.45, 14.5, 0.5' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Nov. 08.45, 14.7, 0.5' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 30.72, 12.5, 1.8' (C. Wyatt, 0.25-m Newtonian reflector)

C/2017 M4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 27.82, 16.0, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2017 O1 (ASASSN1)
Total-magnitude and coma-diameter estimates:
2017 Nov. 19.14, 10.6, 2.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Nov. 17.74, 10.9, 2.5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2017 Nov. 17.20, 9.9, 5' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector)
2017 Nov. 16.96, 10.5, 2.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Nov. 16.74, 10.0, 2.5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Nov. 16.25, 9.8, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Nov. 15.95, 10.1, 2.5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Nov. 14.88, 9.9, 2.5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Nov. 14.87, 11.4, 2' (S. Szabo, Sopron, 0.6-m Newtonian reflector; 3.0' tail in p.a. 210)
2017 Nov. 14.23, 9.6, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Nov. 13.88, 9.6, 21' (S. Fritsche, 0.1-m refractor; 0.07-deg tail in p.a. 218)
2017 Nov. 13.79, 8.9, 5' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Nov. 13.71, 9.6, 3.5' (M. Meyer, 0.254-m Newtonian reflector)
2017 Nov. 13.08, 11.3, 2.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Nov. 12.86, 10.5, 4.1' (C. Harder, Tondern/DK, 0.402-m Newtonian reflector)
2017 Nov. 12.75, 10.0, 6' (T. Karhula, Virsbo, Sweden, 25x100 binoculars)
2017 Nov. 12.31, 9.4, 17' (T. Lehmann, 0.106-m refractor; 0.18-deg tail in p.a. 230)
2017 Nov. 11.96, 10.9, 3' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2017 Nov. 10.80, 10.1, 4.5' (C. Harder, Jeersdorf, Germany , 0.402-m Newtonian reflector)
2017 Nov. 07.73, 10.0, 4' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2017 Nov. 06.75, 9.7, 4.5' (C. Harder, Jeersdorf, Germany , 0.198-m Newtonian reflector)
2017 Nov. 06.75, 8.6, 7' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Nov. 03.89, 10.1, 9.8' (S. Fritsche, 0.1-m refractor)
2017 Nov. 03.47, 9.2, 19' (T. Lehmann, 0.106-m refractor; 0.24-deg tail in p.a. 232)
2017 Nov. 02.50, 8.8, 7' (C. Hergenrother, 30x125 binoculars)
2017 Nov. 02.17, 9.2, 6' (M. Meyer, 0.254-m Newtonian reflector)
2017 Oct. 30.98, 9.8, 3.5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Oct. 30.96, 9.4, 5' (M. Meyer, 29x100 binoculars)
2017 Oct. 30.16, 10.0, 6' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector)
2017 Oct. 30.10, 10.1, 3.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Oct. 30.01, 11.0, 6.3' (J. Warell, 0.25-m Schmidt-Cassegrain; 20.5' tail in p.a. 255)
2017 Oct. 29.98, 9.8, 5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2017 Oct. 28.46, 8.8, 8' (C. Hergenrother, 30x125 binoculars)
2017 Oct. 28.40, 9.2, 19' (T. Lehmann, 0.106-m refractor; 0.35-deg tail in p.a. 238)
2017 Oct. 28.38, 9.3, 5' (M. Linnolt, Volcano, Hawaii, 24x80 binoculars)
2017 Oct. 28.20, [ 9.8, -- (S. Aguirre, Son, Mex., 0.2-m Schmidt-Cassegrain)
2017 Oct. 28.09, 10.0, 3.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Oct. 27.12, 10.5, 3.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Oct. 26.64, 9.9, 5' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Oct. 25.98, 9.4, 3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Oct. 25.26, 11.0, 3.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 25.07, 8.6, 8' (C. Harder, Ustrine, Kroatien, 0.195-m Newtonian reflector)
2017 Oct. 24.86, 8.9, 6' (C. Harder, Ustrine, Kroatien, 0.3-m Newtonian reflector)
2017 Oct. 24.23, 8.8, 7' (C. Hergenrother, 30x125 binoculars)
2017 Oct. 23.44, 8.9, 22' (T. Lehmann, 0.106-m refractor; 0.32-deg tail in p.a. 233)
2017 Oct. 22.90, 8.3, 8' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Oct. 22.84, 10.1, 4.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Oct. 22.78, 9.4, 6' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)

C/2017 S6 (Catalina)
Total-magnitude and coma-diameter estimates:
2017 Nov. 13.95, 14.5, 4' (S. Fritsche, 0.1-m refractor)
2017 Nov. 13.07, 13.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 31.23, 17.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 29.25, 15.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2017 T1 (Heinze)
Total-magnitude and coma-diameter estimates:
2017 Nov. 15.20, 15.1, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Nov. 14.27, 16.1, 0.5' (M. Masek, 0.3-m Schmidt-Cassegrain; 1.4' tail in p.a. 256)

C/2017 T3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 23.91, 17.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)