M13 Globular Cluster
Exposure type:
Roth Ritter
Lamy, NM on 2010, Jul 9
LRGB (140:100:100:100)
RCOS 10RCA @ f/7 (1825mm)
Paramount ME
SBIG STL-11000M, AO-L, Filter set C L R G B

[ click the photo to enlarge ]
Additional Notes:
At its distance of 25,100 light years, its angular diameter of 20' corresponds to a linear 145 light years. Nearby, about 40 arc minutes north-east of M13, is the faint (mag 11) galaxy NGC 6207, visible in many large- and medium-size-field photographs of M13, e.g., in the DSSM image. This galaxy has recently produced a type II supernova (SN 2004A).

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