Recent Comet Brightness Estimates

2P/Encke
Total-magnitude and coma-diameter estimates:
2017 Jul. 04.77, 13.9, 5.5' (T. Lehmann, 0.4-m Newtonian reflector)
2017 Jun. 26.11, 14.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 25.72, 13.1, 8' (T. Lehmann, 0.106-m refractor)

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2017 Jul. 05.77, 13.3, 0.8' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jul. 04.05, 13.0, 1.8' (K. Hills, 0.5-m Newtonian reflector)
2017 Jul. 03.10, 13.0, 2.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Jul. 02.06, 12.2, 1.8' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Jun. 30.65, 12.4, 1.7' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 29.30, 14.0, 0.5' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Jun. 29.30, 14.9, 0.2' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Jun. 29.01, 12.1, 3.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 27.09, 12.8, 4.1' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 26.52, 13.5, 0.8' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 26.10, 12.0, 2.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 23.07, 12.6, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 22.75, 13.5, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 22.03, 12.8, 0.8' (K. Hills, 0.5-m Newtonian reflector)

41P/Tuttle-Giacobini-Kresak
Total-magnitude and coma-diameter estimates:
2017 Jul. 17.26, 12.1, 9' (T. Lehmann, 0.106-m refractor)
2017 Jul. 14.97, 10.6, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Jul. 11.98, 13.1, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Jul. 02.92, 12.7, 1.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Jul. 02.05, 10.7, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Jun. 30.63, 11.2, 4.5' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 29.27, 10.2, 23' (T. Lehmann, 0.106-m refractor)
2017 Jun. 26.96, 12.1, 2.7' (J. Bohusz, Myślin Poland, 0.38-m Newtonian reflector)
2017 Jun. 26.88, [10.6, 3' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2017 Jun. 26.54, 11.8, 3.5' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 26.52, 11.5, 4.5' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 25.96, 12.0, 1.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 24.93, 11.4, 4' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Jun. 24.79, 11.5, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 22.74, 11.1, 3.5' (C. Wyatt, 0.25-m Newtonian reflector)

65P/Gunn
Total-magnitude and coma-diameter estimates:
2017 Jul. 11.96, 13.0, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 30.61, 14.1, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 28.99, 13.7, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 26.55, 14.6, 0.9' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector)
2017 Jun. 26.51, 14.0, 0.8' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 26.50, 14.0, 0.8' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 24.44, 13.8, 0.7' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 22.47, 13.9, 0.8' (C. Wyatt, 0.25-m Newtonian reflector)

71P/Clark
Total-magnitude and coma-diameter estimates:
2017 Jul. 19.91, 10.3, 2' (C. Labordena, Ares del Maestrat, 0.2-m Schmidt-Cassegrain)
2017 Jul. 18.36, 10.1, 12' (T. Lehmann, 0.106-m refractor)
2017 Jul. 15.01, 10.5, 3' (M. Goiato, 0.22-m Newtonian reflector)
2017 Jul. 14.94, 9.8, 2.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Jul. 14.00, 10.3, 3' (K. Hills, 0.5-m Newtonian reflector)
2017 Jul. 02.04, 10.1, 2.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Jun. 30.61, 10.3, 3.1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 29.25, 9.7, 16' (T. Lehmann, 0.106-m refractor)
2017 Jun. 28.97, 9.8, 5.9' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 28.08, 10.3, 4' (M. Goiato, 0.22-m Newtonian reflector)
2017 Jun. 27.56, 11.3, 1' (A. Pearce, Nedlands, 0.41-m Newtonian reflector)
2017 Jun. 26.55, 10.5, 3.9' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector)
2017 Jun. 26.51, 11.0, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 25.54, 11.3, 0.8' (A. Pearce, Nedlands, 0.41-m Newtonian reflector)
2017 Jun. 24.43, 10.6, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 23.94, 11.3, 2.5' (C. Labordena, Culla, 0.15-m Newtonian reflector)
2017 Jun. 23.06, 10.3, 4' (M. Goiato, 0.22-m Newtonian reflector)
2017 Jun. 22.48, 10.4, 3.1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 22.06, 9.5, 3.8' (K. Hills, 0.5-m Newtonian reflector)

73P-B/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2017 Jul. 03.18, 15.1, 0.5' (K. Hills, 0.5-m Newtonian reflector)

95P/Chiron
Total-magnitude and coma-diameter estimates:
2017 Jul. 06.21, 17.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 22.17, 17.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)

174P/Echeclus
Total-magnitude and coma-diameter estimates:
2017 Jul. 03.19, 17.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

213P/Van Ness
Total-magnitude and coma-diameter estimates:
2017 Jul. 16.06, 13.6, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Jul. 05.76, 13.5, 0.7' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 30.64, 13.6, 0.4' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 29.05, 13.5, 1.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 26.53, 13.9, 0.6' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 22.12, 13.9, 0.5' (K. Hills, 0.5-m Newtonian reflector)

217P/LINEAR
Total-magnitude and coma-diameter estimates:
2017 Jul. 13.20, 11.8, 1.1' (K. Hills, 0.5-m Newtonian reflector; 2.9' tail in p.a. 249)
2017 Jul. 05.79, 12.2, 2.2' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 30.73, 13.0, 0.7' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 24.81, 13.3, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 22.75, 13.3, 0.8' (C. Wyatt, 0.25-m Newtonian reflector)

237P/LINEAR
Total-magnitude and coma-diameter estimates:
2017 Jul. 04.21, 17.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2010 U3 (Boattini)
Total-magnitude and coma-diameter estimates:
2017 Jul. 13.20, 14.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2014 W2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Jul. 14.04, 16.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 29.00, 14.3, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 26.58, 17.0, 0.4' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector)

C/2015 ER61 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Jul. 13.15, 10.9, 2' (K. Hills, 0.5-m Newtonian reflector)
2017 Jul. 05.80, 9.6, 5.6' (C. Wyatt, 0.25-m Newtonian reflector; 20.0' tail in p.a. 258)
2017 Jul. 03.17, 10.4, 2.8' (K. Hills, 0.5-m Newtonian reflector)
2017 Jul. 02.45, 10.0, 3' (C. Hergenrother, 30x125 binoculars)
2017 Jul. 02.43, 10.9, 1.9' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Jul. 02.42, 11.1, 1.5' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Jul. 02.10, 9.5, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Jun. 30.75, 9.7, 4.4' (C. Wyatt, 0.25-m Newtonian reflector; 20.0' tail in p.a. 253)
2017 Jun. 27.04, [ 8.7, 5' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2017 Jun. 26.21, 10.4, 3.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 25.81, 9.1, 15' (T. Lehmann, 0.4-m Newtonian reflector; 0.5-deg tail in p.a. 259)
2017 Jun. 24.82, 9.4, 6' (P. Camilleri, 20x80 binoculars)
2017 Jun. 24.33, 8.9, 4' (M. Goiato, 20x100 binoculars)
2017 Jun. 24.09, 8.7, 4' (C. Labordena, Culla, 0.15-m Newtonian reflector)
2017 Jun. 22.76, 9.3, 4.1' (C. Wyatt, 0.25-m Newtonian reflector; 10.5' tail in p.a. 260)
2017 Jun. 22.43, 9.2, 15' (T. Lehmann, 0.106-m refractor; 0.9-deg tail in p.a. 258)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Jul. 14.96, 14.5, 0.2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Jul. 14.05, 14.0, 0.7' (K. Hills, 0.5-m Newtonian reflector; 1.5' tail in p.a. 131)
2017 Jul. 03.93, [13.5, -- (W. Hasubick, 0.44-m Newtonian reflector)
2017 Jun. 30.62, 14.7, 0.2' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 29.07, 14.1, 0.6' (K. Hills, 0.5-m Newtonian reflector; 1.6' tail in p.a. 132)

C/2015 V2 (Johnson)
Total-magnitude and coma-diameter estimates:
2017 Jul. 20.42, 8.8, 10.3' (C. Wyatt, 0.07-m refractor)
2017 Jul. 19.89, 8.4, 6' (C. Labordena, Ares del Maestrat, 0.2-m Schmidt-Cassegrain)
2017 Jul. 17.46, 8.5, 19' (T. Lehmann, 0.106-m refractor; 0.4-deg tail in p.a. 7)
2017 Jul. 17.29, 8.2, 8' (M. Linnolt, Volcano, Hawaii, 20x60 binoculars)
2017 Jul. 15.00, 8.2, 8' (M. Goiato, 20x100 binoculars)
2017 Jul. 14.93, 7.7, 10' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Jul. 12.99, 7.9, 7.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Jul. 11.38, 8.5, 16' (C. Wyatt, 0.05-m refractor)
2017 Jul. 07.36, 8.2, 19' (T. Lehmann, 0.106-m refractor; 0.7-deg tail in p.a. 356)
2017 Jun. 30.60, 7.9, 12.9' (C. Wyatt, 7x50 binoculars)
2017 Jun. 30.36, 8.0, 22' (T. Lehmann, 0.106-m refractor; 0.6-deg tail in p.a. 356)
2017 Jun. 29.07, 9.2, 3.9' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Jun. 29.06, 9.2, 3.6' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Jun. 28.07, 7.7, 12' (M. Goiato, 7x50 binoculars)
2017 Jun. 28.06, 7.9, 10' (M. Goiato, 20x100 binoculars)
2017 Jun. 27.55, 8.3, 7.5' (A. Pearce, Nedlands, 0.1-m Newtonian reflector)
2017 Jun. 26.97, 8.0, 10' (W. Souza, Rheinsberg, Germany, 7x50 binoculars)
2017 Jun. 26.95, 8.3, 7' (A. Scholten, Eerbeek, 15x80 binoculars)
2017 Jun. 26.87, 8.2, 10' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2017 Jun. 26.52, 8.2, 12' (P. Camilleri, 0.08-m refractor)
2017 Jun. 26.50, 8.1, 13' (C. Wyatt, 7x50 binoculars)
2017 Jun. 25.97, 8.3, 10.1' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 25.53, 8.3, 7' (A. Pearce, Nedlands, 0.1-m Newtonian reflector)
2017 Jun. 25.01, 8.5, 4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Jun. 24.93, 7.8, 34' (T. Lehmann, 0.068-m reflector; 0.6-deg tail in p.a. 352)
2017 Jun. 24.92, 8.6, 7' (G. Scheerle, 9x63 binoculars)
2017 Jun. 24.92, 8.5, 5' (M. Lehký, 25x100 binoculars)
2017 Jun. 24.90, 8.6, 9' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Jun. 24.46, 8.4, 8' (A. Pearce, Nedlands, 0.1-m Newtonian reflector)
2017 Jun. 24.46, 7.9, 10' (P. Camilleri, 20x80 binoculars)
2017 Jun. 24.45, 8.3, 10.6' (C. Wyatt, 0.05-m refractor)
2017 Jun. 24.45, 7.7, 10' (P. Camilleri, 35x80 binoculars)
2017 Jun. 23.92, 8.6, 4' (M. Lehký, 25x100 binoculars)
2017 Jun. 23.90, 8.0, 8' (C. Labordena, Culla, 0.15-m Newtonian reflector; 11.0-deg tail)
2017 Jun. 23.89, 8.4, 8' (G. Scheerle, 9x63 binoculars)
2017 Jun. 23.05, 7.7, 12' (M. Goiato, 7x50 binoculars)
2017 Jun. 23.04, 7.8, 10' (M. Goiato, 20x100 binoculars)
2017 Jun. 22.46, 7.7, 13' (C. Wyatt, 7x50 binoculars)
2017 Jun. 22.12, 7.8, 10' (M. Goiato, 20x100 binoculars)

C/2015 VL62
Total-magnitude and coma-diameter estimates:
2017 Jul. 05.78, 14.7, 0.3' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jul. 03.20, 14.0, 1' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 30.66, 14.6, 0.5' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 24.80, 14.0, 0.7' (P. Camilleri, 0.406-m Newtonian reflector)

C/2016 B1 (NEOWISE)
Total-magnitude and coma-diameter estimates:
2017 Jul. 16.05, 17.2, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 28.94, 16.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Jul. 15.05, 14.9, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Jul. 12.16, 15.6, 0.8' (T. Lehmann, 0.51-m Newtonian reflector)
2017 Jun. 29.93, 13.7, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 29.25, 15.6, 0.8' (T. Lehmann, 0.51-m Newtonian reflector)

C/2016 N4 (MASTER)
Total-magnitude and coma-diameter estimates:
2017 Jul. 04.12, 14.4, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 22.19, 14.6, 0.8' (K. Hills, 0.5-m Newtonian reflector)

C/2016 N6 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Jul. 19.32, 16.3, 0.5' (T. Lehmann, 0.51-m Newtonian reflector)
2017 Jul. 13.02, 15.6, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 29.14, 15.9, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2016 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Jul. 05.82, 14.8, 1.7' (T. Lehmann, 0.4-m Newtonian reflector; 0.03-deg tail in p.a. 214)
2017 Jul. 01.83, 15.3, -- (G. van Buitenen, Siding Spring, MPC Q62, 0.43-m Ritchey-Chretien)

C/2017 K4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2017 Jun. 29.02, 15.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2017 M4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2017 Jul. 16.07, 17.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 28.96, 17.9, 0.3' (K. Hills, 0.5-m Newtonian reflector)