Lewis Swift discovered NGC 6090 = Sw. IX-56 on 24 Jun 1887 and recorded "vF; S; R." His position is 8 seconds west of UGC 10267, though he missed the two companions to the west. This galaxy, itself, is a merged, interacting system with tidal tails, etc. similar to the Antenna Galaxies.

400/500mm - 17.5" (6/15/91): faint, very small, elongated 4:3 SW-NE, even surface brightness. Forms a pair with CGCG 275-028 3' W. Also nearby is UGC 10261 6' W which was not recorded. This is a close double system, though was not resolved.

600/800mm - 24" (7/9/13): at 280x appeared moderately bright, fairly small, oval 4:3 SSW-NNE, 24"x18", high surface brightness. Inspection of the SDSS reveals a close double nucleus of a merged pair with very low surface brightness plumes extending SW and NE.

NGC 6090 is the last and brightest in a trio (WBL 610) with CGCG 275-28 3' W and UGC 10261 6' W. CGCG 275-28 was fairly faint, small, round, very small brighter nucleus, 15" diameter and UGC 10261 appeared fairly faint, moderately large, oval 4:3 NNW-SSE, 40"x30", weak concentration.

Notes by Steve Gottlieb