Recent Comet Brightness Estimates

2P/Encke
Total-magnitude and coma-diameter estimates:
2017 Jun. 19.68, 13.2, 7' (T. Lehmann, 0.4-m Newtonian reflector)
2017 Jun. 06.78, 12.2, 10' (T. Lehmann, 0.106-m refractor)
2017 May. 28.79, 12.3, 10' (T. Lehmann, 0.4-m Newtonian reflector)

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2017 Jun. 26.52, 13.5, 0.8' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 22.75, 13.5, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 19.23, 15.6, 0.3' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Jun. 19.22, 14.3, 0.5' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 May. 30.10, 12.4, 1.6' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 29.75, 13.3, 1.1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 May. 28.10, 12.9, 1.8' (K. Hills, 0.5-m Newtonian reflector)

41P/Tuttle-Giacobini-Kresak
Total-magnitude and coma-diameter estimates:
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. 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)
2017 Jun. 21.65, 10.4, 14' (T. Lehmann, 0.106-m refractor)
2017 Jun. 21.54, 10.4, 5.4' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 19.97, 10.9, 4' (J. Bohusz, Myślin Poland, 0.38-m Newtonian reflector)
2017 Jun. 18.93, 9.8, 9' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Jun. 18.80, 11.0, 1' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 16.27, 9.6, 20' (T. Lehmann, 0.106-m refractor)
2017 Jun. 14.95, 9.5, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Jun. 10.90, 9.4, 9' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Jun. 05.79, 10.0, 3' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 02.99, 9.4, 8' (M. Lehký, 10x100 binoculars)
2017 Jun. 02.19, 10.9, 1.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 02.02, 8.9, 22' (T. Lehmann, 0.075-m reflector)
2017 May. 31.96, 9.4, 8' (M. Lehký, 10x100 binoculars)
2017 May. 30.02, 9.2, 6' (M. Lehký, 10x100 binoculars)
2017 May. 29.73, 9.5, 9.5' (C. Wyatt, 0.25-m Newtonian reflector)
2017 May. 28.95, 9.2, 6' (M. Lehký, 10x100 binoculars)
2017 May. 28.91, 9.3, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 28.05, 8.4, 8.2' (W. Kutschera, 0.25-m Newtonian reflector)
2017 May. 28.02, 8.5, 27' (T. Lehmann, 0.075-m reflector)
2017 May. 28.01, 10.0, 2.4' (M. Paradowski, Dąbrowa, Poland, 0.3-m Newtonian reflector)

65P/Gunn
Total-magnitude and coma-diameter estimates:
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)
2017 Jun. 18.67, 15.0, 0.6' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector)
2017 Jun. 15.50, 13.8, 1' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 13.46, 13.8, 1' (P. Camilleri, 0.406-m Newtonian reflector)
2017 May. 28.09, 13.8, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 28.05, 12.8, 0.9' (W. Kutschera, 0.54-m Newtonian reflector)

71P/Clark
Total-magnitude and coma-diameter estimates:
2017 Jun. 27.56, 11.3, 1' (A. Pearce, Nedlands, 0.41-m Newtonian 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. 23.06, 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. 21.53, 10.5, 2.6' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 21.49, 9.2, 21' (T. Lehmann, 0.106-m refractor)
2017 Jun. 21.17, 10.3, 4' (M. Goiato, 0.22-m Newtonian reflector)
2017 Jun. 20.45, 10.5, 2' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Jun. 18.79, 10.6, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 18.51, 9.9, 3.9' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector)
2017 Jun. 17.38, 10.1, 2' (S. Rae, Karamu, New Zealand, 0.3-m Newtonian reflector)
2017 Jun. 17.31, 10.5, 1.5' (C. Hergenrother, 0.355-m Schmidt-Cassegrain)
2017 Jun. 15.48, 10.5, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 14.97, 10.4, 2.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Jun. 14.43, 10.5, 2' (P. Camilleri, 20x80 binoculars)
2017 Jun. 14.22, 9.8, 14' (T. Lehmann, 0.106-m refractor)
2017 Jun. 13.43, 10.6, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 12.43, 10.2, 2' (P. Camilleri, 20x80 binoculars)
2017 Jun. 05.80, 10.5, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 03.21, 10.8, 2' (M. Goiato, 0.22-m Newtonian reflector)
2017 May. 30.14, 10.9, 2' (M. Goiato, 0.22-m Newtonian reflector)
2017 May. 29.71, 11.3, 1.7' (C. Wyatt, 0.25-m Newtonian reflector; 4.3' tail in p.a. 289)
2017 May. 29.28, 10.3, 11' (T. Lehmann, 0.106-m refractor; 0.14-deg tail in p.a. 291)
2017 May. 28.16, 10.9, 1.9' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 28.08, 13.4, 0.7' (W. Kutschera, 0.54-m Newtonian reflector)

94P/Russell
Total-magnitude and coma-diameter estimates:
2017 May. 28.07, 17.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

95P/Chiron
Total-magnitude and coma-diameter estimates:
2017 Jun. 06.21, 17.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)

213P/Van Ness
Total-magnitude and coma-diameter estimates:
2017 Jun. 26.53, 13.9, 0.6' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 21.79, 14.0, 0.6' (P. Camilleri, 0.406-m Newtonian reflector)
2017 May. 28.13, 14.9, 0.4' (K. Hills, 0.5-m Newtonian reflector)

217P/LINEAR
Total-magnitude and coma-diameter estimates:
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)
2017 Jun. 21.81, 13.0, 1' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 18.81, 13.2, 0.8' (P. Camilleri, 0.406-m Newtonian reflector)

315P/LONEOS
Total-magnitude and coma-diameter estimates:
2017 May. 28.06, 14.5, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2014 W2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Jun. 18.63, 17.0, 0.4' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector)
2017 May. 28.17, 14.9, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2015 ER61 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Jun. 27.04, [ 8.7, 5' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2017 Jun. 24.82, 9.4, 6' (P. Camilleri, 20x80 binoculars)
2017 Jun. 24.33, 8.9, 4' (M. Goiato, 20x100 binoculars)
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)
2017 Jun. 21.82, 9.0, 4' (P. Camilleri, 0.08-m refractor)
2017 Jun. 21.10, 8.0, 4' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Jun. 21.09, 8.2, 3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.2-deg tail in p.a. 260)
2017 Jun. 18.82, 8.8, 2.5' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 15.43, 9.0, 13' (T. Lehmann, 0.106-m refractor; 1.1-deg tail in p.a. 256)
2017 Jun. 10.43, 8.8, 10' (T. Lehmann, 0.51-m Newtonian reflector; 0.4-deg tail in p.a. 255)
2017 Jun. 06.81, 8.6, 5' (P. Camilleri, 20x80 binoculars)
2017 Jun. 05.81, 8.5, 5' (P. Camilleri, 0.08-m refractor)
2017 Jun. 03.46, 8.2, 5' (C. Hergenrother, 10x50 binoculars)
2017 Jun. 03.35, 8.5, 5' (A. Amorim, 0.07-m refractor)
2017 Jun. 03.33, 8.6, 5' (M. Goiato, 20x100 binoculars)
2017 Jun. 02.33, 8.5, 4' (A. Amorim, 0.07-m refractor)
2017 Jun. 02.32, 8.5, -- (W. Souza, 0.1-m refractor)
2017 May. 28.81, 8.5, 13' (T. Lehmann, 0.4-m Newtonian reflector; 0.6-deg tail in p.a. 252)
2017 May. 28.78, 8.1, 6.3' (C. Wyatt, 7x50 binoculars)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 May. 28.18, 14.1, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2015 V2 (Johnson)
Total-magnitude and coma-diameter estimates:
2017 Jun. 27.55, 8.3, 7.5' (A. Pearce, Nedlands, 0.1-m Newtonian reflector)
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. 25.53, 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. 24.92, 8.6, 7' (G. Scheerle, 9x63 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. 23.89, 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)
2017 Jun. 21.88, 8.7, 3' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Jun. 21.52, 7.7, 16.5' (C. Wyatt, 7x50 binoculars)
2017 Jun. 21.50, 8.0, 8' (P. Camilleri, 20x80 binoculars)
2017 Jun. 21.00, 7.1, 15' (J. Gonzalez Suarez, 0.045-m refractor)
2017 Jun. 20.97, 8.7, 7' (V. Kasten, 15x50 binoculars)
2017 Jun. 20.88, 8.7, 3' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Jun. 20.44, 7.9, 12.5' (C. Wyatt, 7x50 binoculars)
2017 Jun. 20.29, 8.2, 8' (M. Linnolt, Volcano, Hawaii, 0.416-m Newtonian reflector; 25.0' tail in p.a. 10)
2017 Jun. 19.93, 8.5, 6.6' (J. Bohusz, Myślin Poland, 0.38-m Newtonian reflector)
2017 Jun. 19.92, 7.7, 10' (M. Paradowski, Lublin, Poland, 20x60 binoculars)
2017 Jun. 19.90, 8.6, 3' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Jun. 19.47, 8.0, 12' (S. Rae, Karamu, New Zealand, 9x63 binoculars)
2017 Jun. 18.99, 9.1, 3.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Jun. 18.92, 7.7, 28' (T. Lehmann, 0.075-m reflector; 0.8-deg tail in p.a. 346)
2017 Jun. 18.91, 8.0, 9' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Jun. 18.90, 8.5, 3' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Jun. 18.90, 8.4, 8.3' (M. Masek, 0.15-m Newtonian reflector; 14.8' tail in p.a. 346)
2017 Jun. 18.90, 7.8, 9' (G. Scheerle, 9x63 binoculars)
2017 Jun. 18.88, 9.3, 4.1' (M. Masek, 0.15-m Newtonian reflector; 20.4' tail in p.a. 346)
2017 Jun. 17.98, 8.7, 3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Jun. 17.97, 8.1, 3.5' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector)
2017 Jun. 17.97, 8.6, 5.6' (J. Bohusz, Myślin Poland, 0.38-m Newtonian reflector)
2017 Jun. 17.96, 8.0, 5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 11x80 binoculars)
2017 Jun. 17.34, 7.8, 9' (S. Rae, Karamu, New Zealand, 9x63 binoculars)
2017 Jun. 17.32, 8.3, 5' (C. Hergenrother, 10x50 binoculars)
2017 Jun. 15.96, 7.5, 11' (A. Scholten, Eerbeek, 15x80 binoculars)
2017 Jun. 15.92, 7.3, 18' (M. Paradowski, Stróża-Kolonia, Poland, 7x50 binoculars)
2017 Jun. 15.90, 7.9, 6' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Jun. 15.89, 7.3, 18' (M. Paradowski, Stróża-Kolonia, Poland, 7x50 binoculars)
2017 Jun. 15.49, 7.7, 12' (P. Camilleri, 0.08-m refractor)
2017 Jun. 15.37, 7.6, 13.1' (C. Wyatt, 7x50 binoculars)
2017 Jun. 15.22, 7.6, 11' (C. Hergenrother, 10x50 binoculars)
2017 Jun. 15.14, 8.5, 5.6' (S. Aguirre, Sonora, Mex., 0.2-m Schmidt-Cassegrain)
2017 Jun. 14.97, 8.1, 8' (V. Kasten, 15x50 binoculars)
2017 Jun. 14.94, 7.2, 15' (J. Gonzalez Suarez, 0.045-m refractor; 0.5-deg tail in p.a. 340)
2017 Jun. 14.93, 8.0, 7' (U. Pilz, 7x50 binoculars; 0.33-deg tail)
2017 Jun. 14.93, 7.6, 28' (T. Lehmann, 0.075-m reflector; 0.8-deg tail in p.a. 344)
2017 Jun. 14.91, 7.9, 6' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Jun. 14.90, 7.8, 6.5' (M. Meyer, 29x100 binoculars)
2017 Jun. 14.88, 8.3, 3.5' (M. Legutko, Gliwice, 0.2-m Newtonian reflector)
2017 Jun. 14.44, 7.6, 10' (P. Camilleri, 20x80 binoculars)
2017 Jun. 14.36, 7.7, 7' (S. Rae, Karamu, New Zealand, 9x63 binoculars)
2017 Jun. 13.45, 7.8, 10' (P. Camilleri, 0.08-m refractor)
2017 Jun. 13.16, 7.4, 12' (C. Hergenrother, 10x50 binoculars)
2017 Jun. 13.01, 8.9, 6.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Jun. 12.44, 7.9, 10' (P. Camilleri, 20x80 binoculars)
2017 Jun. 11.94, 8.2, 10' (M. Goiato, 20x100 binoculars)
2017 Jun. 11.42, 7.8, 10' (P. Camilleri, 20x80 binoculars)
2017 Jun. 11.15, 7.6, 27' (T. Lehmann, 0.106-m refractor; 0.7-deg tail in p.a. 340)
2017 Jun. 10.98, 7.4, 7.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Jun. 10.94, 8.0, 6.9' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 10.92, 8.0, 10' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Jun. 10.04, 8.5, 2.15' (N. Paul, Canary Island, Teide, MPC-G40, 0.5-m Cassegrain reflector)
2017 Jun. 06.96, 8.4, 5.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Jun. 04.89, 8.0, -- (W. Souza, 0.1-m refractor)
2017 Jun. 03.89, 8.0, -- (W. Souza, 0.1-m refractor)
2017 Jun. 03.39, 7.6, 10' (C. Hergenrother, 10x50 binoculars)
2017 Jun. 03.02, 8.0, 7' (A. Ferrao, 0.114-m Newtonian reflector)
2017 Jun. 02.97, 7.3, 13' (A. Novichonok, 10x50 binoculars)
2017 Jun. 02.97, 7.6, 9' (M. Lehký, 10x50 binoculars)
2017 Jun. 02.94, 8.2, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Jun. 02.89, 8.0, -- (W. Souza, 0.1-m refractor)
2017 Jun. 02.89, 8.2, 13.4' (M. Masek, 0.15-m Newtonian reflector; 29.9' tail in p.a. 328)
2017 Jun. 02.88, 8.4, 4' (M. Legutko, Gliwice, 0.3-m Newtonian reflector)
2017 Jun. 02.46, 7.5, 13' (P. Camilleri, 20x80 binoculars)
2017 Jun. 02.17, 7.5, 12' (M. Goiato, 7x50 binoculars)
2017 Jun. 02.16, 7.7, 8' (M. Goiato, 20x100 binoculars)
2017 Jun. 02.14, 8.0, 4.5' (S. Aguirre, Sonora, Mexico., 0.2-m Schmidt-Cassegrain)
2017 Jun. 01.99, 7.6, 9' (A. Novichonok, 10x50 binoculars)
2017 Jun. 01.97, 7.5, 8' (M. Meyer, 29x100 binoculars)
2017 Jun. 01.97, 8.0, 5' (A. Amorim, 0.07-m refractor)
2017 Jun. 01.93, 8.3, 6' (V. Kasten, 50x50 binoculars)
2017 Jun. 01.93, 8.2, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Jun. 01.91, 7.4, 40' (T. Lehmann, 0.075-m reflector; 1.1-deg tail in p.a. 330)
2017 Jun. 01.90, 8.5, 3.5' (U. Pilz, 7x50 binoculars)
2017 Jun. 01.86, 8.2, 4' (M. Legutko, Gliwice, 0.2-m Newtonian reflector)
2017 May. 31.97, 8.2, 5.2' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector)
2017 May. 31.94, 7.8, 10' (A. Novichonok, 10x50 binoculars)
2017 May. 31.94, 7.6, 10' (M. Lehký, 10x50 binoculars)
2017 May. 31.93, 8.1, 8' (V. Kasten, 15x50 binoculars)
2017 May. 31.92, 8.3, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 31.54, 7.4, 18' (C. Wyatt, 7x50 binoculars; 23.0' tail in p.a. 332)
2017 May. 30.91, 7.7, 9' (A. Novichonok, 10x50 binoculars)
2017 May. 30.86, 7.4, 20' (A. Baransky, Bucha, Ukraine, 10x50 binoculars)
2017 May. 30.42, 7.7, 13' (C. Wyatt, 7x50 binoculars)
2017 May. 30.13, 7.8, 6' (M. Goiato, 20x100 binoculars)
2017 May. 30.08, 8.0, 8.2' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 30.01, 7.6, 11' (M. Lehký, 10x50 binoculars)
2017 May. 29.92, 7.6, 9' (A. Novichonok, 10x50 binoculars)
2017 May. 29.14, 7.5, 4.5' (S. Aguirre, Sonora, Mexico, 0.2-m Schmidt-Cassegrain)
2017 May. 28.97, 7.3, 25' (A. Baransky, Bucha, Ukraine, 10x50 binoculars)
2017 May. 28.94, 7.6, 11' (M. Lehký, 10x50 binoculars)
2017 May. 28.91, 7.5, 9' (A. Novichonok, 10x50 binoculars)
2017 May. 28.90, 8.3, 6' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 28.87, 8.0, 4' (M. Legutko, Gliwice, 0.2-m Newtonian reflector)
2017 May. 28.45, 7.4, 17' (C. Wyatt, 7x50 binoculars)

C/2015 VL62
Total-magnitude and coma-diameter estimates:
2017 Jun. 24.80, 14.0, 0.7' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Jun. 03.14, 13.1, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 31.82, 15.0, -- (G. van Buitenen, Siding Spring, MPC Q62, 0.43-m Schmidt-Cassegrain; 20.0" tail in p.a. 70)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Jun. 17.33, 15.6, 1.2' (T. Lehmann, 0.106-m refractor)
2017 Jun. 15.25, 15.2, 1.2' (T. Lehmann, 0.106-m refractor)
2017 Jun. 10.34, 15.7, 0.7' (T. Lehmann, 0.51-m Newtonian reflector)
2017 Jun. 03.02, 13.7, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Jun. 01.97, 15.6, 1' (T. Lehmann, 0.075-m reflector)

C/2016 N4 (MASTER)
Total-magnitude and coma-diameter estimates:
2017 May. 28.21, 13.3, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2016 N6 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 May. 28.19, 16.3, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2017 D2 (Barros)
Total-magnitude and coma-diameter estimates:
2017 May. 28.76, 16.3, -- (G. van Buitenen, Siding Spring, MPC Q62, 0.43-m Schmidt-Cassegrain)

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Jun. 12.90, 18.7, 0.5' (T. Lehmann, 0.25-m Newtonian reflector)
2017 Jun. 02.42, 19.1, -- (G. van Buitenen, Auberry California, US (U69), a600x610 binoculars)