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NGC 3646
Penryn, California
January 2007
M 250 @ f9.3  (ag, ST-4)
ST-10XME LRGB 15 minute subs

NGC 3646 is classified as Sc but does not have the structure of a normal Sc galaxy.  While the core area displays the properties of an Sc galaxy, the outer ring is severely disturbed without uniform rotation speeds resulting in a wave like structure ( Burbridge, et. al., 1961).