John Herschel discovered NGC 3108 = h3220 on 28 Jan 1835 and noted "F; S; R; lbM; 15"." His position (measured on two sweeps) matches ESO 435-032 = PGC 29076.

400/500mm - 17.5" (4/9/94): fairly faint, small, elongated 4:3 ~E-W, weakly concentrated. Located 1.5' NE of a mag 10.5 star. Two mag 14 stars are 0.9' NE and 1.1' NW. NGC 3100 lies 23' W.

Notes by Steve Gottlieb