M 99

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, the nucleus shifted to the upper end of our picture. The present author speculates that this asymmetry could be due to semi-recent encounters with other members of the Virgo Cluster, a hypothesis which may get seconded by the fact that its recession velocity is quite high for a Virgo Cluster member: 2324 km/sec according to the Sky Catalog 2000.0, the highest recession velocity measured for a Messier galaxy (and thus a Messier object at all). This means that it is moving through the Virgo Cluster with a high proper (or peculiar) velocity of at least about 1200 km/sec, by chance in a direction pointing away from us.

Taking into account that the relatively nearby (in the sky) M98 is approaching us at 125 km/sec, and thus moving at about the same peculiar velocity but, by chance, toward us, one may speculate that these two galaxies might have been involved in an encounter, but this is currently not much more than wild speculation.

M99 was the second nebula, or galaxy, to be recognized as a spiral, by Lord Rosse in 1848.

Right ascension	12 : 16.3 (hours : minutes)
Declination	+14 : 42 (degrees : minutes)
Distance	70000.0 (light-years*10^3)
Visual magnitude	10.1