Messier 13

Messier 13
Globular cluster Messier 13 in Hercules
Observation data (J2000 epoch)
ClassV[1][2]
ConstellationHercules
Right ascension16h 41m 41.24s[3]
Declination+36° 27′ 35.5″[3]
Distance22.2 kly (6.8 kpc)[4]
Apparent magnitude (V)5.8[5]
Apparent dimensions (V)20 arcminutes
Physical characteristics
Absolute magnitude–8.5
Mass6×105[6] M
Radius84 ly[7]
Metallicity = –1.33[8] dex
Estimated age11.65 Gyr[8]
Notable featuresOne of the best-known clusters of the Northern Hemisphere
Other designationsNGC 6205[5]
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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  7. ^ distance × sin(diameter_angle / 2) = 84 ly radius
  8. ^ a b Cite error: The named reference mnras404_3_1203 was invoked but never defined (see the help page).