| Messier 13 | |
|---|---|
 Globular cluster Messier 13 in Hercules | |
| 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] |
![{\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4c0821bd80891e071c08e7c7ee8e022baedf522c)
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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