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NGC 3631 - Arp 27     
Ursa Major
Penryn, California
February 2008
M 250 @ f 9.3  (ag, ST-4)
ST-10XME LRGB 10  minutes each

NGC 3631, a galaxy disturbed by a past interaction, while classified as type SASc, it displays two arms rotating at different angles than the remainder of the galaxy.  Note the many HII regions. Fridman, et. al., mapped cyclonic and anti - cyclonic vortices in the gasses that support the two disparate arms.  

Surface brightness is mag. 11, distance is estimated to be 53 mly.