Alphonse Borrelly discovered NGC 3933, along with NGC 3934, around 1871 with a 7.2-inch comet-seeker at the Marseille Observatory. His description (5) reads "pF, E, elliptic, no bright point" and his micrometric position in AN 1885 matches UGC 6839. Dreyer included the discovery in the GC Supplement (5588). The pair was independently found by Pechüle in 1884 in Copenhagen.

400/500mm - 17.5" (3/29/89): faint, fairly small, oval WSW-ENE, almost even surface brightness. Forms a pair with NGC 3934 3.6' NE.

Notes by Steve Gottlieb