M 15
M 15
This cluster has the third rank in known variable star population, after HST image. This core most probably houses a dense, supermassive object, resembling the supermassive objects in galactic nuclei. The one in M15 is among the nearest and better observable to us, being only little more remote than the Galactic Center and much less obscured by interstellar matter. Although the true nature of these objects remains obscure for the moment, many scientists believe they are strong candidates for "Black Holes".
M15 was the first globular cluster in which a planetary nebula, Pease 1 or K 648, could be identified (Pease 1928, on photographic plates taken at Mt. Wilson in 1927).
| Right ascension | 21 : 27.6 (hours : minutes) |
|---|---|
| Declination | +11 : 57 (degrees : minutes) |
| Distance | 40.0 (light-years*10^3) |
| Visual magnitude | 6.0 |
