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Catalogue and alternative designations M22, NGC 6656


Type Globular Cluster 
Position  18 36.4, -23 54
Constellation Sagittarius
Camera and Telescope STXL11002 and 36.8 cm Ritchey Chretien
Focal Ratio F9
Exposure Details LRGB =170:130:80:100 with Baader filters
Description M22 is one of the nearer globular clusters at a distance of 3100 parsecs.  Although there is a lot of absorption in the area it is quite bright at magnitude 5.1 and should be visible to the naked eye in a dark sky.  Measured in terms of brightness alone, M22 ranks third after Omega Centauri and 47 Tucanae.