Recent Comet Brightness Estimates

2P/Encke
Total-magnitude and coma-diameter estimates:
2017 Apr. 28.76, 12.3, 1.4' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Apr. 14.80, 10.9, 8' (T. Lehmann, 0.4-m Newtonian reflector)
2017 Apr. 05.76, 9.8, 4.3' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Apr. 01.87, 9.6, 3.5' (A. Pearce, Nedlands, 0.2-m Newtonian reflector)
2017 Apr. 01.87, 9.6, 4.5' (A. Pearce, Nedlands, 0.1-m Newtonian reflector)
2017 Apr. 01.80, 9.3, 2' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x100 binoculars)

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2017 Apr. 28.74, 13.6, 0.5' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Apr. 28.15, 13.1, 0.4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Apr. 23.20, 13.3, 1.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 13.21, 13.6, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 06.23, 13.6, 1.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 05.75, [14.9, -- (C. Wyatt, 0.25-m Newtonian reflector)
2017 Apr. 02.24, 13.2, 2' (K. Hills, 0.5-m Newtonian reflector)

30P/Reinmuth
Total-magnitude and coma-diameter estimates:
2017 Apr. 17.86, 15.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)

41P/Tuttle-Giacobini-Kresak
Total-magnitude and coma-diameter estimates:
2017 May. 01.01, 7.5, 15' (M. Buechner, Freising, Germany, 8x42 binoculars)
2017 May. 01.00, 7.6, 15' (P. Guzik, Niżna Łąka, 10x50 binoculars)
2017 Apr. 28.73, 8.1, 10' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Apr. 28.07, 7.1, 15' (J. Gonzalez Suarez, 0.045-m refractor)
2017 Apr. 27.98, 8.5, 12' (V. Kasten, 15x50 binoculars)
2017 Apr. 27.97, 7.4, 8.2' (W. Kutschera, 0.54-m Newtonian reflector)
2017 Apr. 26.98, 8.9, 7.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 26.97, 7.8, 15' (A. Scholten, Eerbeek, 15x80 binoculars)
2017 Apr. 26.93, 7.5, 13' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 7x50 binoculars)
2017 Apr. 26.89, 8.4, 14' (V. Kasten, 15x50 binoculars)
2017 Apr. 25.93, 9.3, 6.8' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 25.03, 8.0, 10' (M. Lehký, 10x80 binoculars)
2017 Apr. 24.92, 8.8, 7.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 24.88, 7.6, 8' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 23.93, 9.1, 8.1' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 23.89, 7.8, 13' (V. Kasten, 15x50 binoculars)
2017 Apr. 23.88, 7.0, 10' (W. Vollmann, 0.105-m Newtonian reflector)
2017 Apr. 23.87, 7.3, 10.8' (W. Hasubick, 10x50 binoculars)
2017 Apr. 23.84, 7.4, 7' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 23.45, 7.4, 15' (C. Hergenrother, 10x50 binoculars)
2017 Apr. 22.93, 7.6, 10' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 7x50 binoculars)
2017 Apr. 22.90, 7.1, 12.5' (J. Bohusz, Myślin Poland, 0.25-m Newtonian reflector)
2017 Apr. 22.26, 6.8, 18' (M. Goiato, 7x50 binoculars)
2017 Apr. 21.88, 10.3, 5' (S. Szabo, Sopron, 0.4-m Newtonian reflector)
2017 Apr. 21.87, 7.3, 16' (W. Hasubick, 0.1-m refractor)
2017 Apr. 21.86, 7.5, 13.2' (W. Hasubick, 10x50 binoculars)
2017 Apr. 21.11, 6.9, 15' (J. Gonzalez Suarez, 0.045-m refractor)
2017 Apr. 21.06, 8.6, 7.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 21.04, 6.5, 30' (P. Guzik, 2x40 binoculars)
2017 Apr. 21.03, 6.9, 25' (P. Guzik, 10x50 binoculars)
2017 Apr. 21.02, 7.4, 24' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Apr. 20.88, 6.3, 32' (J. Cerny, 0.05-m refractor)
2017 Apr. 20.88, 7.5, 13' (J. Bohusz, Myślin Poland, 0.25-m Newtonian reflector)
2017 Apr. 20.86, 7.1, 24' (J. Konecny, Hlivice, 25x100 binoculars)
2017 Apr. 20.86, 7.1, 50' (T. Lehmann, 0.068-m reflector)
2017 Apr. 20.22, 7.0, 14' (C. Hergenrother, 10x50 binoculars)
2017 Apr. 19.97, 7.2, 16' (V. Kasten, 15x50 binoculars)
2017 Apr. 19.91, 7.0, 28' (G. Scheerle, 9x63 binoculars)
2017 Apr. 19.89, 7.3, 15' (M. Meyer, 20x88 binoculars)
2017 Apr. 19.32, 6.8, 50' (T. Lehmann, 0.106-m refractor; 0.13-deg tail in p.a. 243)
2017 Apr. 18.97, 7.2, 22' (V. Kasten, 15x50 binoculars)
2017 Apr. 18.89, 7.1, 17' (M. Meyer, 20x88 binoculars)
2017 Apr. 18.86, 7.9, 20' (A. Scholten, Schluchsee, Germany, 8x56 binoculars)
2017 Apr. 18.84, 7.8, 13' (U. Pilz, 16x70 binoculars)
2017 Apr. 18.06, 7.2, 17' (J. Fraser, Alness, Scotland., 10x56 binoculars)
2017 Apr. 17.92, 7.3, 15' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 7x50 binoculars)
2017 Apr. 17.86, 7.3, 12' (V. Kasten, 15x50 binoculars)
2017 Apr. 16.92, 6.9, 20' (T. Karhula, Virsbo, Sweden, 7x50 binoculars)
2017 Apr. 16.23, 6.7, 65' (T. Lehmann, 0.106-m refractor; 0.15-deg tail in p.a. 240)
2017 Apr. 15.95, 7.6, 15.5' (W. Kutschera, 0.13-m Newtonian reflector)
2017 Apr. 15.89, 7.3, 11' (C. Harder, Jeersdorf, Germany , 0.303-m Newtonian reflector)
2017 Apr. 15.85, 7.4, 18' (J. Konecny, Hlivice, 25x100 binoculars)
2017 Apr. 14.87, 7.3, 8' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 14.05, 9.4, 5.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 13.89, 7.3, 8' (C. Harder, Jeersdorf, Germany , 0.195-m Newtonian reflector)
2017 Apr. 13.88, 6.6, 14' (M. Meyer, 20x88 binoculars)
2017 Apr. 13.86, 7.2, 18' (A. Scholten, Eerbeek, 8x56 binoculars)
2017 Apr. 12.85, 6.2, 17' (J. Gonzalez Suarez, 0.045-m refractor)
2017 Apr. 10.10, 6.8, 55' (T. Lehmann, 0.071-m reflector; 0.06-deg tail in p.a. 230)
2017 Apr. 10.09, 6.7, 55' (T. Lehmann, 0.071-m reflector)
2017 Apr. 07.38, 6.6, 60' (T. Lehmann, 0.106-m refractor; 0.1-deg tail in p.a. 220)
2017 Apr. 07.16, 6.8, 22' (C. Labordena, Culla, 11x80 binoculars)
2017 Apr. 07.15, 6.0, 25' (J. Gonzalez Suarez, 0.045-m refractor)
2017 Apr. 07.07, 10.4, 4.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 06.49, 7.0, 16' (C. Hergenrother, 10x50 binoculars)
2017 Apr. 06.10, 6.7, 30' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 7x50 binoculars)
2017 Apr. 06.07, 6.5, 30' (T. Karhula, Virsbo, Sweden, 7x50 binoculars)
2017 Apr. 05.38, 6.6, 65' (T. Lehmann, 0.106-m refractor; 0.13-deg tail in p.a. 215)
2017 Apr. 05.26, 6.2, 16.9' (N. Paul, Mayhill, New Mexico (MPC Code - H06), 0.25-m Cassegrain reflector)
2017 Apr. 05.13, 9.1, 8' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 05.08, 6.7, 23' (M. Meyer, 10x50 binoculars)
2017 Apr. 04.13, 6.6, 17' (M. Meyer, 10x50 binoculars)
2017 Apr. 04.10, 6.4, 25' (J. Gonzalez Suarez, 0.045-m refractor)
2017 Apr. 03.85, 7.4, 25' (V. Kasten, 15x50 binoculars)
2017 Apr. 03.84, 7.1, 15' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 7x50 binoculars)
2017 Apr. 03.18, 6.5, 70' (T. Lehmann, 0.106-m refractor; 0.15-deg tail in p.a. 210)
2017 Apr. 03.11, 6.8, 24' (C. Harder, Jeersdorf, Germany , 8x44 binoculars)
2017 Apr. 03.02, 7.7, 12.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 02.96, 7.8, 9' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 02.89, 7.6, 15' (M. Collins, Everton, 0.103-m refractor)
2017 Apr. 02.84, 7.1, 15' (V. Kasten, 15x50 binoculars)
2017 Apr. 02.80, 6.8, 22' (J. Skopal, Czech Republik, Kuřim, 20x80 binoculars)
2017 Apr. 02.14, 7.0, 20' (C. Labordena, La Serra, 11x80 binoculars)
2017 Apr. 02.09, 6.7, 35' (P. Guzik, 2x40 binoculars)
2017 Apr. 02.09, 7.2, 18' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2017 Apr. 02.08, 7.3, 14' (W. Vollmann, 0.105-m Newtonian reflector)
2017 Apr. 02.06, 6.4, 38' (J. Cerny, 0.05-m refractor)
2017 Apr. 01.95, 7.2, 10' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 01.91, 7.2, 10' (T. Csorgei, Blahova, 10x60 binoculars)
2017 Apr. 01.88, 7.9, 32' (M. Collins, Everton, 0.103-m refractor)
2017 Apr. 01.86, 8.5, 10' (J. Navarro Pina, Bullas ( Murcia , Spain ), 0.305-m Newtonian reflector)
2017 Apr. 01.80, 7.0, 15' (J. Skopal, Czech Republik, Kuřim, 20x80 binoculars)
2017 Apr. 01.16, 6.5, 20' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Apr. 01.06, 6.9, 16' (J. Cerny, 0.05-m refractor)
2017 Apr. 01.01, 6.8, 30' (P. Guzik, 10x50 binoculars)

43P/Wolf-Harrington
Total-magnitude and coma-diameter estimates:
2017 Apr. 04.88, 13.5, 0.7' (K. Hills, 0.5-m Newtonian reflector)

45P/Honda-Mrkos-Pajdusakova
Total-magnitude and coma-diameter estimates:
2017 Apr. 02.90, 14.8, 0.5' (K. Hills, 0.5-m Newtonian reflector)

65P/Gunn
Total-magnitude and coma-diameter estimates:
2017 Apr. 21.11, 14.5, 0.7' (K. Hills, 0.5-m Newtonian reflector)

71P/Clark
Total-magnitude and coma-diameter estimates:
2017 Apr. 29.78, 13.2, 0.7' (A. Pearce, Nedlands, 0.41-m Newtonian reflector)
2017 Apr. 28.76, 12.7, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Apr. 28.13, 12.0, 0.9' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Apr. 21.12, 13.1, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 20.35, 12.7, 6' (T. Lehmann, 0.106-m refractor; 0.05-deg tail in p.a. 280)
2017 Apr. 03.04, 12.6, 0.6' (K. Hills, 0.5-m Newtonian reflector)

73P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2017 Apr. 05.76, 12.3, 2.2' (C. Wyatt, 0.25-m Newtonian reflector; 2.0' tail in p.a. 260)
2017 Apr. 01.84, 11.9, 1.2' (A. Pearce, Nedlands, 0.2-m Newtonian reflector)

74P/Smirnova-Chernykh
Total-magnitude and coma-diameter estimates:
2017 Apr. 12.96, 16.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

93P/Lovas
Total-magnitude and coma-diameter estimates:
2017 Apr. 17.88, 13.6, 0.4' (K. Hills, 0.5-m Newtonian reflector)

94P/Russell
Total-magnitude and coma-diameter estimates:
2017 Apr. 21.10, 17.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 06.04, 17.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

118P/Shoemaker-Levy
Total-magnitude and coma-diameter estimates:
2017 Apr. 06.23, 15.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)

144P/Kushida
Total-magnitude and coma-diameter estimates:
2017 Apr. 18.12, 15.3, 0.5' (K. Hills, 0.5-m Newtonian reflector)

213P/Van Ness
Total-magnitude and coma-diameter estimates:
2017 Apr. 22.16, 16.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

315P/LONEOS
Total-magnitude and coma-diameter estimates:
2017 Apr. 23.84, 13.8, 0.5' (W. Hasubick, 0.44-m Newtonian reflector)
2017 Apr. 18.18, 13.7, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 02.16, 14.2, 0.5' (K. Hills, 0.5-m Newtonian reflector)

330P/Catalina
Total-magnitude and coma-diameter estimates:
2017 Apr. 02.89, 18.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2013 C2 (Tenagra)
Total-magnitude and coma-diameter estimates:
2017 Apr. 23.21, 17.9, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 06.03, 18.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 02.03, 17.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2013 V4 (Catalina)
Total-magnitude and coma-diameter estimates:
2017 Apr. 18.15, 15.8, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2013 X1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Apr. 21.15, 14.1, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 04.97, 14.7, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 02.13, 15.1, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2014 W2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Apr. 21.14, 15.1, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 06.08, 14.7, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2015 ER61 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Apr. 28.77, 7.8, 8.2' (C. Wyatt, 7x50 binoculars)
2017 Apr. 28.75, 7.5, 5' (M. Mattiazzo, Swan Hill, Victoria, Australia, 8x40 binoculars)
2017 Apr. 28.16, 7.4, 5' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Apr. 26.33, 7.6, 6' (W. Souza, 15x70 binoculars)
2017 Apr. 25.09, 7.7, 8' (M. Lehký, 25x100 binoculars)
2017 Apr. 24.29, 7.4, 6' (W. Souza, 15x70 binoculars)
2017 Apr. 23.47, 7.3, 7' (C. Hergenrother, 10x50 binoculars)
2017 Apr. 23.22, 8.0, 5.8' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 22.50, 7.1, 4' (C. Hergenrother, 30x125 binoculars)
2017 Apr. 22.29, 7.4, 4' (M. Goiato, 20x100 binoculars)
2017 Apr. 22.29, 7.5, 5' (W. Souza, 0.09-m refractor)
2017 Apr. 21.17, 7.0, 5' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Apr. 19.34, 7.1, 8' (W. Souza, 15x70 binoculars)
2017 Apr. 18.20, 7.2, 5.1' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 17.48, 7.3, 18' (T. Lehmann, 0.106-m refractor; 1.6-deg tail in p.a. 252)
2017 Apr. 16.80, 7.2, 15' (T. Lehmann, 0.4-m Newtonian reflector; 0.6-deg tail in p.a. 254)
2017 Apr. 16.27, 6.9, 7' (M. Goiato, 20x100 binoculars)
2017 Apr. 15.34, 6.5, 12' (M. Goiato, 7x50 binoculars)
2017 Apr. 14.21, 7.5, 6.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 13.80, 7.0, 20' (T. Lehmann, 0.4-m Newtonian reflector; 0.6-deg tail in p.a. 254)
2017 Apr. 10.48, 7.1, 19' (T. Lehmann, 0.106-m refractor; 1.4-deg tail in p.a. 253)
2017 Apr. 10.25, 6.7, 8' (M. Goiato, 7x50 binoculars)
2017 Apr. 10.21, 7.3, 6.3' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 09.50, 6.8, -- (S. Aguirre, Son, Mex., 7x50 binoculars)
2017 Apr. 07.80, 6.5, 8' (M. Mattiazzo, Swan Hill, Victoria, Australia, 8x40 binoculars)
2017 Apr. 07.18, 6.2, 8' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Apr. 06.77, 6.3, 8' (M. Mattiazzo, Swan Hill, Victoria, Australia, 8x40 binoculars)
2017 Apr. 06.50, 5.9, 8' (C. Hergenrother, 10x50 binoculars)
2017 Apr. 06.36, 6.6, 5.4' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Apr. 06.36, 7.9, 3.6' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Apr. 05.80, 6.2, 8' (M. Mattiazzo, Swan Hill, Victoria, Australia, 8x40 binoculars)
2017 Apr. 05.74, 6.4, 7.3' (C. Wyatt, 7x50 binoculars)
2017 Apr. 05.34, 6.2, 7' (M. Goiato, 7x50 binoculars; 0.7-deg tail in p.a. 255)
2017 Apr. 05.33, 6.4, 6' (M. Goiato, 20x100 binoculars; 0.7-deg tail in p.a. 255)
2017 Apr. 04.80, 6.6, 24' (T. Lehmann, 0.4-m Newtonian reflector; 0.5-deg tail in p.a. 257)
2017 Apr. 04.17, 7.4, 4' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Apr. 03.80, 8.3, 5' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x100 binoculars; 10.0' tail in p.a. 255)
2017 Apr. 03.73, 8.6, 4' (C. Wyatt, 0.25-m Newtonian reflector; 29.0' tail in p.a. 253)
2017 Apr. 02.28, 8.4, 6' (M. Goiato, 20x100 binoculars; 0.3-deg tail in p.a. 260)
2017 Apr. 02.22, 8.8, 3.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 02.18, 8.8, 3.5' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain)
2017 Apr. 02.10, [ 7.0, 4' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2017 Apr. 01.81, 8.3, 6' (A. Pearce, Nedlands, 0.1-m Newtonian reflector)
2017 Apr. 01.81, 8.8, 5' (A. Pearce, Nedlands, 0.2-m Newtonian reflector; 16.0' tail in p.a. 258)
2017 Apr. 01.79, 8.3, 5' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x100 binoculars; 10.0' tail in p.a. 255)
2017 Apr. 01.71, 8.1, 6.8' (C. Wyatt, 11x70 binoculars)
2017 Apr. 01.18, 8.2, 6' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Apr. 01.12, 8.1, 5' (J. Cerny, 25x100 binoculars)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Apr. 22.15, 15.0, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 02.23, 15.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2015 V2 (Johnson)
Total-magnitude and coma-diameter estimates:
2017 May. 01.01, 8.6, 8' (M. Buechner, Freising, Germany, 8x42 binoculars)
2017 May. 01.01, 8.2, 10' (P. Guzik, Niżna Łąka, 10x50 binoculars)
2017 Apr. 29.93, 9.6, 5.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 29.85, 8.4, 6.5' (M. Meyer, 20x88 binoculars)
2017 Apr. 28.72, 8.8, 3.8' (C. Wyatt, 0.25-m Newtonian reflector; 17.3' tail in p.a. 304)
2017 Apr. 28.39, 8.4, 8' (M. Linnolt, Volcano, Hawaii, 0.416-m Newtonian reflector; 20.0' tail in p.a. 310)
2017 Apr. 28.12, 9.2, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.2-deg tail in p.a. 300)
2017 Apr. 27.98, 8.8, 5' (V. Kasten, 15x50 binoculars)
2017 Apr. 27.93, 8.3, 8.3' (W. Kutschera, 0.54-m Newtonian reflector; 0.2-deg tail)
2017 Apr. 27.02, 9.3, 2' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars; 5.0' tail in p.a. 270)
2017 Apr. 26.97, 8.7, 3.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 6.7' tail in p.a. 286)
2017 Apr. 26.96, 8.3, 10' (A. Scholten, Eerbeek, 15x80 binoculars)
2017 Apr. 26.88, 8.7, 6' (V. Kasten, 15x50 binoculars)
2017 Apr. 25.90, 9.7, 5.8' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 24.90, 9.0, 6.6' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 24.89, 9.1, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 24.83, 8.4, 7' (M. Lehký, 20x100 binoculars)
2017 Apr. 23.91, 9.4, 4.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 23.88, 8.6, 9' (V. Kasten, 15x50 binoculars)
2017 Apr. 23.86, 9.2, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 23.84, 8.4, 9.1' (W. Hasubick, 10x50 binoculars)
2017 Apr. 23.46, 7.7, 10' (C. Hergenrother, 10x50 binoculars)
2017 Apr. 23.02, 8.9, 4' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars; 15.0' tail in p.a. 295)
2017 Apr. 22.83, 8.8, 10' (J. Bohusz, Myślin Poland, 0.25-m Newtonian reflector)
2017 Apr. 22.39, 8.8, 10' (M. Linnolt, Volcano, Hawaii, 0.416-m Newtonian reflector; 20.0' tail in p.a. 300)
2017 Apr. 22.25, 8.8, 4' (M. Goiato, 20x100 binoculars)
2017 Apr. 22.14, 8.8, 6.1' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 21.87, 8.3, 4' (S. Szabo, Sopron, 0.4-m Newtonian reflector; 10.0' tail in p.a. 300)
2017 Apr. 21.85, 8.5, 7' (W. Hasubick, 10x50 binoculars)
2017 Apr. 21.85, 8.4, 5.3' (W. Hasubick, 0.1-m refractor)
2017 Apr. 21.14, 9.2, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.2-deg tail in p.a. 300)
2017 Apr. 21.05, 8.4, 10' (P. Guzik, 10x50 binoculars)
2017 Apr. 21.01, 8.6, 9' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Apr. 20.99, 8.7, 7' (J. Bohusz, Myślin Poland, 0.25-m Newtonian reflector)
2017 Apr. 20.87, 8.7, 10.6' (J. Cerny, 8x40 binoculars; 18.0' tail in p.a. 315)
2017 Apr. 20.87, 8.2, 16' (J. Konecny, Hlivice, 25x100 binoculars)
2017 Apr. 20.22, 7.8, 12' (C. Hergenrother, 10x50 binoculars)
2017 Apr. 20.08, 8.2, 25' (T. Lehmann, 0.071-m reflector; 0.35-deg tail in p.a. 310)
2017 Apr. 19.98, 9.2, 4' (V. Kasten, 15x50 binoculars)
2017 Apr. 19.90, 8.6, 8' (G. Scheerle, 9x63 binoculars)
2017 Apr. 19.87, 8.3, 8' (M. Meyer, 20x88 binoculars)
2017 Apr. 19.85, 8.8, 7' (A. Novichonok, 0.2-m Newtonian reflector)
2017 Apr. 18.98, 8.8, 7' (V. Kasten, 15x50 binoculars)
2017 Apr. 18.91, 8.9, 2.5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars; 13.0' tail in p.a. 305)
2017 Apr. 18.88, 8.7, 9' (M. Meyer, 20x88 binoculars)
2017 Apr. 18.86, 8.5, 10' (A. Scholten, Schluchsee, Germany, 15x80 binoculars)
2017 Apr. 18.85, 7.6, 5' (U. Pilz, 16x70 binoculars; 0.27-deg tail in p.a. 315)
2017 Apr. 18.10, 9.0, 6.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 17.91, 10.1, 2.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 16.92, 7.7, 10' (T. Karhula, Virsbo, Sweden, 7x50 binoculars)
2017 Apr. 16.35, 9.2, 8' (M. Linnolt, Volcano, Hawaii, 0.416-m Newtonian reflector; 20.0' tail in p.a. 300)
2017 Apr. 16.24, 8.5, 26' (T. Lehmann, 0.106-m refractor; 0.35-deg tail in p.a. 312)
2017 Apr. 15.98, 7.7, 7.3' (W. Kutschera, 0.13-m Newtonian reflector; 0.34-deg tail)
2017 Apr. 15.91, 9.3, 3.5' (C. Harder, Jeersdorf, Germany , 0.303-m Newtonian reflector; 11.0' tail in p.a. 290)
2017 Apr. 15.85, 7.8, 12' (J. Konecny, Hlivice, 25x100 binoculars)
2017 Apr. 14.88, 9.0, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 13.89, 9.4, 4.5' (M. Meyer, 26x88 binoculars)
2017 Apr. 13.89, 8.6, 6' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2017 Apr. 12.93, 9.4, 4.9' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 10.11, 8.8, 18' (T. Lehmann, 0.071-m reflector; 0.24-deg tail in p.a. 309)
2017 Apr. 09.40, [ 6.4, -- (S. Aguirre, Son, Mex, 0.1-m refractor)
2017 Apr. 07.39, 8.8, 18' (T. Lehmann, 0.106-m refractor; 0.25-deg tail in p.a. 312)
2017 Apr. 07.16, 9.2, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Apr. 07.09, 10.1, 4.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 06.90, 9.4, 4' (A. Novichonok, 0.2-m Newtonian reflector)
2017 Apr. 06.11, 8.5, 5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 7x50 binoculars)
2017 Apr. 05.73, 9.6, 4' (C. Wyatt, 0.25-m Newtonian reflector; 9.6' tail in p.a. 298)
2017 Apr. 05.10, 9.9, 2.6' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 05.10, 9.3, 3.5' (M. Meyer, 0.152-m refractor)
2017 Apr. 04.99, 9.5, 4' (A. Novichonok, 0.114-m Newtonian reflector)
2017 Apr. 04.12, 9.4, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.2-deg tail in p.a. 310)
2017 Apr. 03.94, 9.2, 4' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 03.72, 9.7, 3.8' (C. Wyatt, 0.25-m Newtonian reflector; 14.0' tail in p.a. 318)
2017 Apr. 03.10, 9.3, 4.7' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector; 5.5' tail in p.a. 310)
2017 Apr. 02.97, 9.2, 3' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 02.92, 10.3, 4.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 02.16, 9.6, 5' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain; 10.0' tail)
2017 Apr. 02.09, 8.9, 6' (M. Biely, Czech Republic, Brno, 20x80 binoculars; 0.15-deg tail in p.a. 290)
2017 Apr. 02.08, 8.8, 8' (P. Guzik, 10x50 binoculars)
2017 Apr. 02.07, 9.0, 6.5' (J. Cerny, 25x100 binoculars; 12.0' tail in p.a. 300)
2017 Apr. 01.99, 8.8, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 01.92, 9.4, 4.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 01.80, 9.9, 4' (A. Pearce, Nedlands, 0.2-m Newtonian reflector)
2017 Apr. 01.10, 9.2, 3.5' (G. van Buitenen, Dordrecht, NL, 64x305 binoculars)
2017 Apr. 01.07, 9.1, 8.1' (J. Cerny, 25x100 binoculars; 12.0' tail in p.a. 285)
2017 Apr. 01.06, 9.0, 5' (P. Guzik, 0.326-m Newtonian reflector; 0.4-deg tail in p.a. 270)
2017 Apr. 01.05, 8.8, 8' (P. Guzik, 10x50 binoculars)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Apr. 21.19, 15.7, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 15.46, 16.6, 0.5' (T. Lehmann, 0.51-m Newtonian reflector)
2017 Apr. 06.12, 15.8, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2016 N6 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Apr. 21.16, 17.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 06.06, 16.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 04.02, 14.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2016 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Apr. 17.37, 16.6, -- (G. van Buitenen, Mayhill, New Mexico (H05), a120x250 binoculars)

C/2017 B3 (LINEAR)
Total-magnitude and coma-diameter estimates:
2017 Apr. 18.11, 15.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2017 E1 (Borisov)
Total-magnitude and coma-diameter estimates:
2017 Apr. 28.79, 11.0, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Apr. 07.19, 7.9, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Apr. 05.77, 10.9, 3' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Apr. 04.19, 8.5, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Apr. 01.85, 11.2, 2.5' (A. Pearce, Nedlands, 0.2-m Newtonian reflector)
2017 Apr. 01.19, 8.8, 4' (J. Gonzalez Suarez, 25x100 binoculars)

C/2017 E4 (Lovejoy)
Total-magnitude and coma-diameter estimates:
2017 Apr. 25.05, [ 9.9, -- (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2017 Apr. 23.48, [ 8.5, -- (C. Hergenrother, 30x125 binoculars)
2017 Apr. 21.16, 9.2, 3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.2-deg tail in p.a. 320)
2017 Apr. 21.10, 9.8, 2' (W. Hasubick, 0.1-m refractor)
2017 Apr. 21.06, 9.9, 2' (P. Guzik, 0.326-m Newtonian reflector; 0.08-deg tail in p.a. 320)
2017 Apr. 19.04, 9.5, 3' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2017 Apr. 17.48, 10.0, 2' (T. Lehmann, 0.106-m refractor; 0.16-deg tail in p.a. 317)
2017 Apr. 10.12, 7.5, 12' (T. Lehmann, 0.071-m reflector; 0.8-deg tail in p.a. 301)
2017 Apr. 10.11, 6.7, 3' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector; 7.0' tail in p.a. 290)
2017 Apr. 10.10, 7.1, 4' (J. Cerny, 25x100 binoculars)
2017 Apr. 10.10, 6.9, 4' (W. Vollmann, 0.105-m Newtonian reflector)
2017 Apr. 09.49, 6.3, -- (S. Aguirre, Son, Mex., 7x50 binoculars)
2017 Apr. 09.13, 6.3, 5' (G. van Buitenen, Dordrecht, NL, 0.13-m Newtonian reflector)
2017 Apr. 09.10, 6.3, 5' (P. Guzik, 10x50 binoculars)
2017 Apr. 08.49, 6.2, 8' (S. Aguirre, Sonora, Mex., 7x50 binoculars)
2017 Apr. 08.15, 6.4, 3' (M. Deconinck, Artignosc-sur-Verdon, 25x126 binoculars; 10.0' tail in p.a. 15)
2017 Apr. 07.50, 6.3, 7.6' (S. Aguirre, Son, Mex., 7x50 binoculars)
2017 Apr. 07.48, 7.2, 14' (T. Lehmann, 0.106-m refractor; 1.4-deg tail in p.a. 295)
2017 Apr. 07.17, 7.1, 5' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Apr. 07.17, 7.0, 6' (C. Labordena, Culla, 11x80 binoculars)
2017 Apr. 07.12, 5.6, 4.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 06.50, 6.3, 5' (C. Hergenrother, 10x50 binoculars)
2017 Apr. 06.12, 6.4, 8' (C. Harder, Jeersdorf, Germany , 15x70 binoculars)
2017 Apr. 06.08, 6.9, 4' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 11x80 binoculars)
2017 Apr. 06.06, 6.5, 4' (T. Karhula, Virsbo, Sweden, 7x50 binoculars)
2017 Apr. 05.79, 7.4, 8.4' (C. Wyatt, 7x50 binoculars)
2017 Apr. 05.36, 6.5, 5' (M. Goiato, 20x100 binoculars)
2017 Apr. 04.36, 6.3, 6' (M. Goiato, 20x100 binoculars)
2017 Apr. 04.16, 6.9, 4' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Apr. 04.01, 6.5, 4' (A. Novichonok, 0.114-m Newtonian reflector)
2017 Apr. 03.80, 6.7, 3' (M. Mattiazzo, Swan Hill, Victoria, Australia, 8x40 binoculars)
2017 Apr. 03.78, 6.7, 5' (T. Lovejoy, Birkdale, 15x70 binoculars)
2017 Apr. 03.34, 6.5, 5' (W. Souza, 15x70 binoculars)
2017 Apr. 03.10, 6.5, 7' (C. Harder, Jeersdorf, Germany , 8x44 binoculars)
2017 Apr. 03.09, 6.3, 5.5' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector)
2017 Apr. 02.78, 6.3, 5' (T. Lovejoy, Birkdale, 15x70 binoculars)
2017 Apr. 02.25, 7.1, 6.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 02.18, 8.5, 8' (C. Labordena, La Serra, 11x80 binoculars)
2017 Apr. 02.17, 8.3, 7' (C. Labordena, La Serra, 11x80 binoculars)
2017 Apr. 02.12, 7.0, 5' (W. Vollmann, 0.105-m Newtonian reflector)
2017 Apr. 02.10, 7.1, 5.4' (J. Cerny, 25x100 binoculars)
2017 Apr. 02.10, 6.6, 5' (P. Guzik, 10x50 binoculars; 0.15-deg tail in p.a. 270)
2017 Apr. 02.09, 6.8, 5.5' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2017 Apr. 01.86, 7.1, 7' (A. Pearce, Nedlands, 0.1-m Newtonian reflector)
2017 Apr. 01.86, 7.0, 5.5' (A. Pearce, Nedlands, 0.2-m Newtonian reflector)
2017 Apr. 01.78, 7.0, 3' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x100 binoculars)
2017 Apr. 01.76, 7.3, 8.3' (C. Wyatt, 7x50 binoculars)
2017 Apr. 01.39, 8.4, 3' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 Apr. 01.17, 7.4, 5' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Apr. 01.10, 7.6, 4.4' (J. Cerny, 25x100 binoculars)
2017 Apr. 01.09, 7.0, 5' (P. Guzik, 0.326-m Newtonian reflector; 0.5-deg tail in p.a. 270)
2017 Apr. 01.08, 7.0, 5' (P. Guzik, 10x50 binoculars)
2017 Apr. 01.03, 7.5, 4.7' (A. Novichonok, 0.114-m Newtonian reflector)

P/2015 TP200 (LINEAR)
Total-magnitude and coma-diameter estimates:
2017 Apr. 13.92, 16.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)