Globular Star Cluster M-54 (NGC 6715)

M-54, Globular Star Cluster

The image was taken with an ST-6 CCD camera thru Kopernik's 20-inch telescope working at a focal ratio of F/4.9. This was an 8 minute exposure and the image scale is about 9 x 12.5 arc minutes, or 2.3 arc seconds per pixel.
North is at the top.

Description of M-54 in The Deep Sky Field Guide to Uranometria 2000: