Globular cluster Messier 15 (M15, NGC 7078) is among the more conspicuous of these great stellar swarms. At a distance of about 33,600 light years, its diameter of 18.0 arc min corresponds to a linear extension of about 175 light-years, and its total visual brightness of 6.2 magnitudes corresponds to an absolute magnitude of -9.17, or roughly 360,000 times that of our sun.
(Canon EOS20D, f/6.3 Focal Reducer/Field Flattener, Meade 12" LX90 GPS, Jim W. Coleman, Port Orchard, Washington)