M99
Although situated in constellation Coma Berenices, is one of the bright spiral members of the Virgo Cluster of galaxies. It is of type Sc, rotates clockwise (unlike the nearby spiral M100), and is unusually asymmetric.
Three supernovae have been recorded in M99: the type II supernova 1967H, mag 14, in June 1967. type II supernova 1972Q, mag 15.6, on Dec 16, 1972, and 1986I of type I, mag 14, on May 17, 1986.
M99 was the second nebula, or galaxy, to be recognized as a spiral, by Lord Rosse in 1848.