Globular Cluster M12 (NGC 6218), class IX, in Ophiuchus

RA 16 : 47.2 (h:m); DEC -01 : 57 (deg:m); Distance 16000 light years
Visual Brightness 6.7 (mag); Apparent Dimension 16.0 (arc min)

Messier 12 (M12, NGC 6218) is nearly a twin of its apparent neighbour, M10, and is only slightly larger and an idea fainter.
At its distance of about 16,000 light years, the apparent diameter of M12 of 16.0 arc minutes corresponds to about 75 light years.

Source and more: SEDS

July 6, 2009 21:41 - 22:14 UT.
Imaging: William Optics Zenithstar 80 ED II APO, f/6.8 [focal length 545 mm], Astronomik LRGB filters; ATK16IC camera.
Exposures: L: 13x90s [1x1]; RGB: 5x45s [2x2], unguided.