Right Ascension	16 : 57.1 (h:m)
Declination	-04 : 06 (deg:m)
Distance	13.4 (kly)
Visual Brightness	6.6 (mag)
Apparent Dimension	15.1 (arc min)
Discovered by	Charles Messier May 29th, 1764

This 7th mag globular cluster is about 15.1 arc minutes in diameter, more than half the diameter of the full moon. At its distance of 16,000 light years, this corresponds to a  diameter of 70 light years. Its bright core, however, is only little more than half as large. It is receding at 69 km/sec.

Close by: M12, 3 1/2deg ne and M107 to the se.

Messier observed M10 on May 29th, 1764  "Nebula without a star, in the belt of Ophiuchus..." "...this is a beautiful, circular nebula..." Charles Messier from his Catalogue

Main information courtesy S.E.D.S.