Messier 13

Messier 13
Messier 13
	Globular cluster Messier 13 in Hercules
Observation data (J2000 epoch)
Class	V
Constellation	Hercules
Right ascension	16h 41m 41.24s
Declination	+36° 27′ 35.5″
Distance	22.2 kly (6.8 kpc)
Apparent magnitude (V)	5.8
Apparent dimensions (V)	20 arcminutes
Physical characteristics
Absolute magnitude	–8.5
Mass	6×105 M☉
Radius	84 ly
Metallicity	= –1.33 dex
Estimated age	11.65 Gyr
Notable features	One of the best-known clusters of the Northern Hemisphere
Other designations	NGC 6205
	See also: Globular cluster, List of globular clusters

Messier 13 or M13 (also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules, the Hercules Globular Cluster, or the Great Hercules Cluster), is a globular cluster of several hundred thousand stars in the constellation of Hercules.

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