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It is one of the less bright Messier globulars, especially lacking the bright core which most globulars have. Nevertheless it is not too difficult to resolve, even at its rather large distance. This led to its classification in concentration class X. At its distance of 32,900 light-years. its diameter of 8.8 arc minutes corresponds to a linear extension of about 85 light years. Site2 CCD on Jacobus Kapteyn Telescope. 4x9 second exposures in Kitt Peak V-band, 4x12 second exposures in Harris B-band and 5x6.4 second exposures in Harris R-band.
CREDIT
Robert Greimel (ING), Javier Mendez (ING) and Nik Szymanek.
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