Édouard Stephan discovered NGC 2958 = St IX-20 on 7 Mar 1877 with the 31" reflector at the Marseille Observatory. His position matches UGC 5160 = PGC 27620.

400/500mm - 17.5" (4/13/96): faint, fairly small, slightly elongated SSW-NNE. Broad and weak concentration with a fairly low surface brightness. A mag 12.5 star lies 4' WSW. "Frosty Leo" nebula lies 13' NW. Observation made through thin clouds.

17.5" (3/25/95): fairly faint, fairly small, 40" diameter, round, very weak concentration. A mag 12 star lies 4.3' WSW.

Notes by Steve Gottlieb