Messier 10
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| Messier 10 | |
 Messier 10, as imaged by the 2MASS survey of 1969. |
|
| Observation data (J2000 epoch) | |
|---|---|
| Class | VII |
| Constellation | Ophiuchus |
| Right ascension | 16h 57m 08.99s[1] |
| Declination | -04° 05′ 57.6″[1] |
| Distance | 14.3 kly (4.4 kpc) |
| Apparent magnitude (V) | 6.4[1] |
| Apparent dimensions (V) | 20′.0 |
| Physical characteristics | |
| Mass | kg ( M ) |
| Radius | 41.6 ly [2] |
| Other designations | NGC 6254[1] |
| See also: Globular cluster, List of globular clusters | |
Messier 10 (also known as M10, Globular Cluster M10 or NGC 6254) is a globular cluster in the constellation Ophiuchus. It was discovered by Charles Messier on May 29, 1764, cataloged as number 10 in his list, and described as a "Nebula without stars."
[edit] Description
M10 has an apparent diameter of some 20', about 2/3 the apparent diameter of the moon, which translates to a spatial diameter of 83 light-years at its estimated distance of 14,300 light-years. Viewed through medium sized telescopes it appears about half that size (8' to 9'), as its brighter core is only 35 light-years across. Only 4 variable stars have been discovered in this cluster.
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