Recent Comet Brightness Estimates

24P/Schaumasse
Total-magnitude and coma-diameter estimates:
2017 Oct. 12.47, 12.2, 6' (T. Lehmann, 0.106-m refractor)
2017 Oct. 03.48, 12.4, 6' (T. Lehmann, 0.106-m refractor)
2017 Oct. 03.15, 10.9, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Oct. 02.47, 13.7, 2.2' (R. Ramlow, 0.25-m Newtonian reflector)
2017 Oct. 01.12, 13.1, 1.9' (J. Cerny, 0.355-m Newtonian reflector)
2017 Sep. 25.76, [12.2, 0.7' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Sep. 22.47, 13.9, 1.8' (R. Ramlow, 0.25-m Newtonian reflector)
2017 Sep. 22.24, 12.9, 0.7' (K. Hills, 0.5-m Newtonian reflector)

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2017 Oct. 16.77, 12.2, 1.1' (M. Paradowski, Jabłonna, Poland, 0.203-m Newtonian reflector)
2017 Oct. 14.86, 13.1, 0.8' (W. Kutschera, 0.51-m Newtonian reflector)
2017 Oct. 13.81, 11.7, 2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Oct. 12.41, 12.2, 1.8' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 11.88, 13.2, 3.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 10.89, 13.2, 3.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 07.95, 13.0, 3.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 06.89, 12.8, 3.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 05.89, 12.8, 3.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 28.91, 12.7, 2.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 27.98, 12.7, 2.9' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 26.95, 12.7, 2.9' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 25.93, 12.6, 3.1' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 25.81, 11.7, 3' (P. Guzik, 0.326-m Newtonian reflector)
2017 Sep. 25.78, 12.6, 0.7' (W. Hasubick, 0.44-m Newtonian reflector)
2017 Sep. 25.49, [13.4, 0.8' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Sep. 22.86, 13.7, 0.9' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Sep. 22.81, 12.5, 1.8' (U. Pilz, 0.32-m Newtonian reflector)
2017 Sep. 22.46, 11.9, 3' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Sep. 21.93, 12.1, 3.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 21.87, 11.9, 1.3' (N. Paul, Canary Island, Teide G40, 0.43-m Cassegrain reflector)
2017 Sep. 21.86, 13.4, 1.5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 0.38-m Newtonian reflector)

47P/Ashbrook-Jackson
Total-magnitude and coma-diameter estimates:
2017 Sep. 27.15, 15.8, 0.6' (K. Hills, 0.5-m Newtonian reflector)

49P/Arend-Rigaux
Total-magnitude and coma-diameter estimates:
2017 Oct. 10.91, 18.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)

62P/Tsuchinshan
Total-magnitude and coma-diameter estimates:
2017 Oct. 16.09, 13.8, 0.3' (W. Hasubick, 0.44-m Newtonian reflector)
2017 Oct. 15.07, 13.8, 0.8' (W. Kutschera, 0.51-m Newtonian reflector)
2017 Oct. 02.47, 13.5, 2.5' (R. Ramlow, 0.25-m Newtonian reflector)
2017 Oct. 01.08, 13.7, 1.7' (J. Cerny, 0.355-m Newtonian reflector)

71P/Clark
Total-magnitude and coma-diameter estimates:
2017 Oct. 12.40, 13.0, 1.2' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 10.85, 12.2, 1' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 22.45, 12.2, 1.9' (C. Wyatt, 0.25-m Newtonian reflector)

73P-B/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2017 Sep. 27.21, 15.8, 0.4' (K. Hills, 0.5-m Newtonian reflector)

95P/Chiron
Total-magnitude and coma-diameter estimates:
2017 Oct. 11.98, 17.9, 0.1' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 01.14, 17.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 26.02, 17.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

96P/Machholz
Total-magnitude and coma-diameter estimates:
2017 Oct. 13.38, 11.6, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 12.38, 11.5, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 06.37, 14.2, 0.27' (R. Ramlow, 0.51-m Newtonian reflector)
2017 Oct. 03.38, 14.5, 0.25' (R. Ramlow, 0.51-m Newtonian reflector)
2017 Sep. 25.39, 15.8, 0.24' (R. Ramlow, 0.51-m Newtonian reflector)

139P/Vaisala-Oterma
Total-magnitude and coma-diameter estimates:
2017 Sep. 27.24, 18.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)

174P/Echeclus
Total-magnitude and coma-diameter estimates:
2017 Oct. 01.16, 17.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 28.17, 17.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)

213P/Van Ness
Total-magnitude and coma-diameter estimates:
2017 Oct. 11.83, 14.5, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 25.48, [12.7, 0.5' (S. Yoshida, 0.4-m Newtonian reflector)

217P/LINEAR
Total-magnitude and coma-diameter estimates:
2017 Sep. 30.15, 14.2, 1' (M. Masek, 0.15-m Newtonian reflector; 0.8' tail in p.a. 264)
2017 Sep. 25.74, [14.0, 0.5' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Sep. 21.76, 13.9, 0.8' (C. Wyatt, 0.25-m Newtonian reflector)

240P/NEAT
Total-magnitude and coma-diameter estimates:
2017 Oct. 12.00, 13.6, 1' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 11.06, 14.0, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 21.72, 14.2, 0.7' (C. Wyatt, 0.25-m Newtonian reflector)

352P/Skiff
Total-magnitude and coma-diameter estimates:
2017 Sep. 26.07, 15.5, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2011 KP36 (Spacewatch)
Total-magnitude and coma-diameter estimates:
2017 Oct. 16.34, 15.6, 0.7' (R. Ramlow, 0.25-m Newtonian reflector)
2017 Sep. 27.22, 14.8, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 23.22, 13.8, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2015 ER61 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 17.10, 13.2, 0.6' (U. Pilz, 0.32-m Newtonian reflector)
2017 Oct. 12.19, 12.2, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 01.18, 12.6, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 01.05, 14.1, 1.8' (J. Cerny, 0.355-m Newtonian reflector)
2017 Sep. 28.74, 13.2, 4' (T. Lehmann, 0.4-m Newtonian reflector; 0.52-deg tail in p.a. 265)
2017 Sep. 25.70, 14.2, 0.6' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Sep. 22.99, [12.5, -- (U. Pilz, 0.32-m Newtonian reflector)
2017 Sep. 22.21, 12.8, 1' (K. Hills, 0.5-m Newtonian reflector)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 06.88, 13.9, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 22.88, 12.2, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 22.79, 14.2, 0.3' (S. Szabo, Sopron, 0.6-m Newtonian reflector)

C/2015 V1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 16.35, 14.3, 0.6' (R. Ramlow, 0.25-m Newtonian reflector; 1.9' tail in p.a. 20)
2017 Sep. 28.13, 14.6, 0.7' (K. Hills, 0.5-m Newtonian reflector)

C/2015 V2 (Johnson)
Total-magnitude and coma-diameter estimates:
2017 Oct. 12.40, 12.3, 1.7' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Oct. 10.40, 11.5, 5' (T. Lehmann, 0.106-m refractor)
2017 Oct. 03.43, 11.6, 5' (T. Lehmann, 0.106-m refractor)
2017 Oct. 03.38, 11.6, 2.8' (R. Ramlow, 0.106-m refractor)
2017 Sep. 22.47, 10.9, 3.9' (C. Wyatt, 0.25-m Newtonian reflector)

C/2015 VL62
Total-magnitude and coma-diameter estimates:
2017 Oct. 08.96, 15.9, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 25.50, [13.7, 0.4' (S. Yoshida, 0.4-m Newtonian reflector)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 11.14, 14.3, 0.8' (R. Ramlow, 0.25-m Newtonian reflector)
2017 Oct. 09.12, 14.2, 0.7' (R. Ramlow, 0.25-m Newtonian reflector)
2017 Oct. 09.11, 14.7, 1.5' (T. Lehmann, 0.51-m Newtonian reflector; 0.02-deg tail in p.a. 38)
2017 Oct. 06.86, 14.2, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 06.18, 14.3, 0.6' (R. Ramlow, 0.61-m Newtonian reflector)
2017 Oct. 04.18, 14.1, 0.7' (R. Ramlow, 0.61-m Newtonian reflector)
2017 Sep. 26.18, 14.4, 0.7' (R. Ramlow, 0.25-m Newtonian reflector)
2017 Sep. 25.19, 14.4, 0.7' (R. Ramlow, 0.15-m refractor)
2017 Sep. 24.17, 14.5, 0.7' (R. Ramlow, 0.61-m Newtonian reflector)
2017 Sep. 22.84, 13.3, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 22.82, 14.5, 0.5' (S. Szabo, Sopron, 0.6-m Newtonian reflector)

C/2016 N4 (MASTER)
Total-magnitude and coma-diameter estimates:
2017 Oct. 13.88, 13.7, 0.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Oct. 11.97, 14.7, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 04.20, 14.6, 0.4' (R. Ramlow, 0.61-m Newtonian reflector)
2017 Oct. 01.04, 14.4, 0.8' (J. Cerny, 0.355-m Newtonian reflector)
2017 Sep. 25.71, 14.6, 0.3' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Sep. 22.84, 15.7, 0.4' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Sep. 22.00, 15.0, 0.6' (K. Hills, 0.5-m Newtonian reflector)

C/2016 N6 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 16.10, 15.0, 0.5' (R. Ramlow, 0.61-m Newtonian reflector)
2017 Sep. 30.85, 14.1, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 25.86, 14.7, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 25.10, 15.5, 1' (T. Lehmann, 0.51-m Newtonian reflector)
2017 Sep. 24.16, 15.2, 0.45' (R. Ramlow, 0.61-m Newtonian reflector)
2017 Sep. 22.80, 13.7, 0.7' (S. Szabo, Sopron, 0.6-m Newtonian reflector)

C/2016 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 17.04, 13.4, 1.2' (P. Guzik, 0.326-m Newtonian reflector)
2017 Oct. 16.09, 13.6, 0.3' (W. Hasubick, 0.44-m Newtonian reflector)
2017 Oct. 03.20, 13.2, 1.1' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Sep. 30.12, 14.0, 1.2' (M. Masek, 0.15-m Newtonian reflector; 1.2' tail in p.a. 234)
2017 Sep. 28.77, 13.6, 1.7' (R. Ramlow, 0.106-m refractor; 2.4' tail in p.a. 260)
2017 Sep. 28.75, 13.5, 3.3' (T. Lehmann, 0.4-m Newtonian reflector; 0.05-deg tail in p.a. 246)
2017 Sep. 25.73, 14.0, 0.6' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Sep. 21.75, 13.8, 0.9' (C. Wyatt, 0.25-m Newtonian reflector)

C/2017 D2 (Barros)
Total-magnitude and coma-diameter estimates:
2017 Oct. 12.01, 16.5, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 25.95, 16.3, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 11.92, 18.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 08.13, 18.4, 0.15' (R. Ramlow, 0.61-m Newtonian reflector)
2017 Sep. 20.17, 19.1, -- (G. van Buitenen, Auberry California, US (U69), 0.61-m Ritchey-Chretien)

C/2017 M4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 11.90, 17.0, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 25.84, 17.2, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2017 O1 (ASASSN1)
Total-magnitude and coma-diameter estimates:
2017 Oct. 19.27, [ 9.7, -- (S. Aguirre, Son, Mex., 0.2-m Schmidt-Cassegrain)
2017 Oct. 17.00, 8.9, 10' (P. Guzik, 10x50 binoculars)
2017 Oct. 16.92, 10.2, 3.8' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Oct. 16.89, 8.8, 7' (M. Paradowski, Jabłonna, Poland, 0.203-m Newtonian reflector)
2017 Oct. 16.82, 8.8, 7' (M. Paradowski, Jabłonna, Poland, 25x100 binoculars)
2017 Oct. 16.81, 9.0, 5' (M. Paradowski, Jabłonna, Poland, 0.203-m Newtonian reflector)
2017 Oct. 16.09, 10.5, 3.2' (W. Hasubick, 0.44-m Newtonian reflector)
2017 Oct. 15.88, 10.3, 3.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Oct. 15.83, 9.2, 7' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2017 Oct. 15.03, 10.2, 4.6' (W. Kutschera, 0.25-m Newtonian reflector; 0.13-deg tail)
2017 Oct. 14.96, 8.9, 6' (G. van Buitenen, Dordrecht, Netherlands, 64x305 binoculars)
2017 Oct. 14.95, 10.0, 5.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Oct. 14.90, 8.8, 10' (M. Buechner, Kempten, 42x100 binoculars)
2017 Oct. 14.00, 8.3, 7' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Oct. 13.90, 8.5, 7' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Oct. 12.84, 9.4, 6' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2017 Oct. 11.85, 10.6, 3.8' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Oct. 11.83, 8.0, 15' (U. Pilz, 16x70 binoculars)
2017 Oct. 11.47, 8.8, 19' (T. Lehmann, 0.106-m refractor; 0.27-deg tail in p.a. 238)
2017 Oct. 11.45, 8.8, 11' (R. Ramlow, 0.106-m refractor; 13.7' tail in p.a. 248)
2017 Oct. 10.90, 8.3, 7' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Oct. 03.46, 8.9, 22' (T. Lehmann, 0.106-m refractor; 0.53-deg tail in p.a. 240)
2017 Oct. 03.19, 8.1, 11' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Oct. 02.93, 8.8, 4.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Oct. 02.23, 11.2, 4.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Oct. 02.15, 8.3, 4.4' (N. Paul, Canary Island, Teide G40, 0.43-m Cassegrain reflector)
2017 Oct. 02.05, 9.1, 4.5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Oct. 01.29, 9.5, 5' (M. Goiato, 0.22-m Newtonian reflector)
2017 Oct. 01.00, 9.9, 9' (J. Cerny, 25x100 binoculars)
2017 Sep. 30.98, 9.2, 4.5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Sep. 30.90, 9.4, 7.9' (M. Paradowski, Zatwarnica, Poland, 0.034-m reflector)
2017 Sep. 30.90, 8.8, 13.2' (M. Paradowski, Zatwarnica, Poland, 0.034-m reflector; 0.13-deg tail in p.a. 245)
2017 Sep. 30.34, 10.4, -- (S. Aguirre, Son, Mex., 0.2-m Schmidt-Cassegrain)
2017 Sep. 30.00, 9.2, 7' (D. Bamberger, 0.254-m Ritchey-Chretien; 4.0' tail in p.a. 250)
2017 Sep. 29.99, 10.3, 4.6' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Sep. 29.97, 9.2, 4.5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Sep. 29.94, 9.0, 5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2017 Sep. 29.06, 9.3, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Sep. 28.39, 9.2, 6' (C. Hergenrother, 30x125 binoculars)
2017 Sep. 28.35, 10.2, -- (S. Aguirre, Son, Mex., 0.2-m Schmidt-Cassegrain)
2017 Sep. 27.94, 9.2, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Sep. 26.91, 9.2, 3.5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Sep. 26.35, 10.0, -- (S. Aguirre, Son, Mex., 50x200 binoculars)
2017 Sep. 25.91, 9.2, 10' (P. Guzik, 10x50 binoculars)
2017 Sep. 25.69, 9.5, 8' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Sep. 25.28, 8.8, 21' (T. Lehmann, 0.106-m refractor; 0.19-deg tail in p.a. 244)
2017 Sep. 25.01, 8.3, 10' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Sep. 25.00, 8.5, 9' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Sep. 24.39, [ 9.7, -- (S. Aguirre, Sonora, Mex., 0.2-m Schmidt-Cassegrain)
2017 Sep. 23.93, 9.7, 5' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2017 Sep. 23.14, 7.7, 6.3' (N. Paul, Canary Island, Teide G40, 0.43-m Cassegrain reflector)
2017 Sep. 23.12, 10.4, 3.2' (W. Kutschera, 0.25-m Newtonian reflector; 0.09-deg tail)
2017 Sep. 23.10, 8.8, 5.5' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector)
2017 Sep. 22.98, 8.5, 15' (U. Pilz, 0.32-m Newtonian reflector)
2017 Sep. 22.94, 9.6, 7' (G. van Buitenen, Dordrecht, Netherlands, 0.305-m Newtonian reflector)
2017 Sep. 22.43, 9.5, 11.9' (R. Ramlow, 0.106-m refractor)
2017 Sep. 22.08, 9.8, 4.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Sep. 21.86, 9.6, 8' (T. Karhula, Virsbo, Sweden, 18x50 binoculars)
2017 Sep. 21.73, 9.5, 11.4' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Sep. 21.39, 10.4, -- (S. Aguirre, Son, Mex., 0.2-m Schmidt-Cassegrain)
2017 Sep. 20.40, 9.2, 6' (C. Hergenrother, 30x125 binoculars)
2017 Sep. 20.39, 10.3, 2' (S. Aguirre, Sonora, Mex., 0.2-m Schmidt-Cassegrain)
2017 Sep. 20.04, 9.0, 7' (C. Labordena, La Llacua, 0.2-m Ritchey-Chretien)
2017 Sep. 20.02, 10.1, 3.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)

C/2017 S3 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Oct. 11.86, 19.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Sep. 27.86, 20.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)