A stellar close encounter at the core of globular cluster M15 (artist's impression) (opo9313b)

M15 · globular cluster

Messier 15

Messier 15 or M15 is a globular cluster in the constellation Pegasus.

RA21h 29m 58sDec+12° 10' 00"

Image: G. Dana Berry, STSCI. Public domain, via Wikimedia Commons.

Identity & coordinates

Identification

Primary designation: M15
All designations: M15 · NGC 7078
Object type: Globular Cluster
Constellation: Pegasus
Best viewing: Autumn

Coordinates & physical

Right ascension (J2000): 21h 29m 58s
Declination (J2000): +12° 10' 00"
Apparent magnitude (V): —
Distance: —

III

Visibility tonight

The science

Messier 15 or M15 is a globular cluster in the constellation Pegasus. It was discovered by Jean-Dominique Maraldi in 1746 and included in Charles Messier's catalogue of comet-like objects in 1764. At an estimated 12.5±1.3 billion years old, it is one of the oldest known globular clusters.

Summary adapted from Wikipedia · CC-BY-SA-4.0