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M4, Globular Cluster In Scorpius

   M4 is one of the closest globular clusters, perhaps the closest, at 6500 light years from Earth. It has a relatively low luminosity, probably related to the relatively small number of stars—estimated at 44,000. It lies close to Antares and is thus easy to find with binoculars.


Date  2001-06-15
Scope  RCOS Ritchey-Chretien 12.5 inch at f6.75 on A-P 1200GTO mount      
Exposure  One, on hypered Supra 400 film, 45 min with IDAS filter
Processing        Stretched and unsharp masked in PhotoShop