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NGC 6166    (Image down sized 0.75x)
Penryn, California
May 2007
M 250 @ f9.3 (ag, ST-4)
ST-10XME LRGB 10 minute subs

NGC 6166 is a large dim type E galaxy  and is the dominant galaxy within the Hercules cluster (Abell 2199).  The core is split into three distinct knots surrounding an AGN (active galactic nuclei ) containing an estimated ~10^9 solar masses (Di Matteo,, 2001).