Édouard Stephan discovered NGC 3213 = St XIII-58 on 13 Mar 1883. His position matches UGC 5590.
400/500mm - 17.5" (4/25/92): very faint, small, round, low almost even surface brightness. Located 10' NE of mag 8.1 SAO 99075 and 21' SE of the striking double star Gamma Leonis (2.2/3.5 at 4.5").
Notes by Steve Gottlieb