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Messier 15
| Messier 15 | |
|---|---|
 Deep Broadband (RGB) image of M15 | |
| Observation data (J2000 epoch) | |
| Class | IV[1] |
| Constellation | Pegasus |
| Right ascension | 21h 29m 58.33s[2] |
| Declination | +12° 10′ 01.2″[2] |
| Distance | 35.69 ± 0.43 kly (10.944 ± 0.131 kpc)[3] |
| Apparent magnitude (V) | 6.2[4] |
| Apparent dimensions (V) | 18′.0 |
| Physical characteristics | |
| Mass | 5.6×105[5] M☉ |
| Radius | ~88 ly[6] |
| VHB | 15.83 |
| Metallicity | = –2.37[7] dex |
| Estimated age | 12.0 Gyr[8] |
| Notable features | steep central cusp |
| Other designations | NGC 7078, GCl 120[9] |
![{\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4c0821bd80891e071c08e7c7ee8e022baedf522c)
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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