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Catalogue and alternative designations M4, NGC 6121


Type Globular Cluster 
Position  16 23.6, -26 32
Constellation Scorpius
Camera and Telescope STXL16200 and 36.8 cm Ritchey Chretien 
Focal Ratio F9
Exposure Details LRGB 83:120:80:100 All 1x1 using Astrodon filters
Description This bright globular cluster is one of the nearest to earth and is visible to the naked eye under a very dark sky.  The most noticeable feature is the bar of brighter stars running across the centre (top to bottom).  This is visible in quite small telescopes. There is some dust very faintly visible in the field.