Messier 13
Globular cluster in the constellation Hercules / From Wikipedia, the free encyclopedia
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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.
Quick Facts Observation data (J2000 epoch), Class ...
Messier 13 | |
---|---|
Observation data (J2000 epoch) | |
Class | V[1][2] |
Constellation | Hercules |
Right ascension | 16h 41m 41.24s[3] |
Declination | +36° 27′ 35.5″[3] |
Distance | 22.2 kly (6.8 kpc)[4] |
Apparent magnitude (V) | 5.8[5] |
Apparent dimensions (V) | 20 arcminutes |
Physical characteristics | |
Absolute magnitude | –8.5 |
Mass | 6×105[6] M☉ |
Radius | 84 ly[7] |
Metallicity | = –1.33[8] dex |
Estimated age | 11.65 Gyr[8] |
Notable features | One of the best-known clusters of the Northern Hemisphere |
Other designations | NGC 6205[5] |
See also: Globular cluster, List of globular clusters |
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