Messier 10
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."
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.
External links
 Messier 10, SEDS Messier pages
Messier 10, Galactic Globular Clusters Database page
References
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