Hermann A. Kobold discovered IC 3153 on 8 Apr 1894 with the 18" refractor at the Strasboug Observatory. He noted "vF, S, NGC 4273 near." His position is an exact match with CGCG 042-019 = PGC 39693.

400/500mm - 17.5" (3/28/87): very faint, small, almost round, diffuse. Located 3' E of NGC 4259 in the NGC 4261 group and second faintest of 8 in the field.

600/800mm - 24" (4/28/14): faint, small, round, 15" diameter, even surface brightness. Located 3.9' ENE of NGC 4259. Forms the western vertex of an isosceles triangle with NGC 4273 6' SE and NGC 4270 5' NW.

Notes by Steve Gottlieb