Messier 15

Messier 15
Messier 15
	Deep Broadband (RGB) image of M15
Observation data (J2000 epoch)
Class	IV
Constellation	Pegasus
Right ascension	21h 29m 58.33s
Declination	+12° 10′ 01.2″
Distance	35.69 ± 0.43 kly (10.944 ± 0.131 kpc)
Apparent magnitude (V)	6.2
Apparent dimensions (V)	18′.0
Physical characteristics
Mass	5.6×105 M☉
Radius	~88 ly
VHB	15.83
Metallicity	= –2.37 dex
Estimated age	12.0 Gyr
Notable features	steep central cusp
Other designations	NGC 7078, GCl 120
	See also: Globular cluster, List of globular clusters

Messier 15 or M15 (also designated NGC 7078 and sometimes known as the Great Pegasus Cluster) 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.^{[citation needed]} At an estimated 12.5±1.3 billion years old, it is one of the oldest known globular clusters.^[10]

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