Édouard Stephan discovered NGC 5133 = St XI-19 on 23 Apr 1881. His position matches MCG -01-34-015 = PGC 46909.

400/500mm - 17.5" (6/7/97): faint, very small, round, 20" diameter (much smaller than listed dimensions). Nearly even surface brightness except for a faint stellar nucleus with direct vision. Located 15' NNE mag 7.1 SAO 139322. HCG 64 lies 19' NE. PGC magnitude (12.6) appears too bright.

Notes by Steve Gottlieb