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NGC 3991/3994/3995 - Arp 313
Ursa Major
Penryn, California
March 2007
M 250 @ f9.3 (ag, ST-4)
ST-10XME LRGB 15 minute subs

The NGC 3991 group are starburst galaxies still reeling from the effects of a close encounter and/or collision some 10 of millions ago.  NGC 3991 (at lower right) is classified Irr B, NGC 3994 (right center) is classified  Sc/P and NGC 3995 is a SBm type galaxy.