COMET C/2006 P1 (McNaught)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2007
Jan. 7.68, 0.5*, 2' (T. Scarmato, Calabria, Italy, 7x50 binoculars);
7.48, -0.5:*, -- (D. W. E. Green, Rowley, MA, 7x35 binoculars; alt. 4 deg, bright twilight; bright, small head with short tail);
7.30, 0.0:*, 1' (N. Biver, Meudon, France, 7x50 binoculars; 0.4-deg tail; alt. 5.7 deg; civil twilight);
6.96, -0.6:*, 0'.5 (P. Creed, New London, OH, 10x50 binoculars; alt 1.9 deg; civil twilight);
6.68, -0.3:*, 0'.3 (H. Dahle, Holmenkollen, Oslo, Norway, 7x50 binoculars; 0.8-deg tail in p.a. 0 deg.; alt. 1.5 deg.; naut. twilight);
6.28, 0.2:*, 1' (B. H. Granslo, Tryvann, Oslo, Norway, 7x50 binoculars; 1-deg tail in p.a. 0 deg, alt. 2.5 deg.; naut. twilight);
5.72, -0.5:*, -- (D. Moore, Dublin, Ireland, naked eye; 0.25-deg fan tail and 3' coma in 25x100 binoculars; alt. 2.5 deg);
http://cfa-www.harvard.edu/iau/icq/CometMags.html