Messier 10 and Messier 12 are two globular clusters located 3.25 degrees apart in the constellation of Ophiuchus.

M10 (lower left) has an apparent diameter of 20 arcminutes, which would correspond to a diameter of 83 light-years in space at the cluster's estimated distance of 14,300 light-years.

M12 (upper right) has an apparent diameter of 16 arcminutes, which corresponds to a true diameter of 75 light-years in space at the cluster's estimated distance of 16,000 light-years.

M10 was discovered by Charles Messier on May 29, 1764. M12 was discovered by Messier a day later on May 30, 1764.

North is to the top in the above image.

Messier 10 and Messier 12 Catalogs: M10, NGC 6254 M12, NGC 6218 Object Type: Globular Clusters Magnitude: M10: 6.6v M12: 6.1v Size: M10: 20' M12: 16' Constellation: Ophiuchus Image Field Centered At: RA: 16h 52m 28s Dec: -03° 00' 06" Individual object coordinates can be found in the Master List.