Édouard Stephan discovered NGC 798 = St III-4 on 10 Dec 1871 with the 31" reflector at the Marseille Observatory, along with III-3 = NGC 789 (discovered earlier by Heinrich d'Arrest). His position matches UGC 1539 = PGC 7823.

300/350mm - 13.1" (12/22/84): very faint, very small, very elongated NW-SE, small bright core. Located 11' E of NGC 789.

Notes by Steve Gottlieb