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Great Pegasus Cluster

M15, NGC 7078

Proper NameGreat Pegasus Cluster
Messier NumberM15
NGC/IC NumberNGC 7078
Right Ascension21h 29m 58s
Declination+12° 10' 1"
Distancec.33,600 light years
c.10,300 parsecs
MagnitudeApparent: +6.2
Absolute: -8.9
DiameterApparent: 18'
Actual: c.180 light years
Optimum VisibilityAugust / September
NotesOne of the oldest globular clusters of the Milky Way, M15 has undergone a process known as core collapse, in which more massive stars have been drawn together into the central parts of the cluster. In the case of M15, there are indications that a black hole may have formed within the densely packed core stars.

A distant Globular Cluster in the southern parts of Pegasus, near its border with Equuleus. The cluster, which is unusual in that it contains a planetary nebula, is nearly 180 light years in diameter.


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