Albert Marth discovered NGC 3093 = m 192 on 22 Jan 1865 and noted "eF, vS". His position matches CGCG 008-021 = PGC 28977 in the NGC 3090 group.

400/500mm - 17.5" (3/16/96): faint, extremely small, round, 15" diameter with a hint of a small halo. Located in the NGC 3090 group 5.8' due east of NGC 3090 among a small group of stars. A mag 10.5 star is 2.8' NW, a mag 13 star 2' SE and a mag 12 star 2.2' WSW. NGC 3092 lies 2.9' SW.

Notes by Steve Gottlieb