Édouard Stephan discovered NGC 5911 = St XI-32 on 5 Jun 1880 His position is accurate.

400/500mm - 17.5" (7/8/94): fairly faint, fairly small, round, 40" diameter, moderate even concentration to a small bright core, occasional stellar nucleus. Four stars in an elongated kite asterism follow by about 3'. Forms a close pair with an extremely faint companion CGCG 049-134 1.5' NE.

600/800mm - 24" (5/11/13): fairly faint, fairly small, elongated 4:3 SW-NE, 30"x24", small brighter core. Brightest in the KTG 60 trio with CGCG 49-134 1.6' NE and CGCG 49-135 6' SSE. A mag 12 star and three mag 14 stars in a group is ~3' E.

Notes by Steve Gottlieb