M3 Globular Cluster; Canes Venatici 
Astro Systeme Austria N12 f/3.5 astrograph 
KAI-11000M 
Total Exposure 2 Hours; LRGB  30:30:30:30 minutes; unbinned 
April 16-17, 2007;  Inkom, ID 
Comments: Messier 3 is one of the most outstanding globular clusters, containing an estimated half million stars. It is famous for the large number of variable stars discovered in it.  This cluster was the first 'original' discovery by Charles Messier when he logged it on May 3rd, 1764. At that time it was the 76th deep sky object ever observed by human eyes (and apparatus), although at that time, it was only the 55th known nebulous object, while 21 objects had been forgotten again, according to the sources. (from SEDS.org) 
 
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This cluster was the first 'original' discovery by Charles Messier when he logged it on May 3rd, 1764. At that time it was the 76th deep sky object ever observed by human eyes (and apparatus), although at that time, it was only the 55th known nebulous object, while 21 objects had been forgotten again, according to the sources