Édouard Stephan discovered NGC 904 = St XIII-18 (along with NGC 903 = St XIII-17) on 13 Dec 1884 with the 31" reflector at the Marseille Observatory and reported "vF, vS, R, lbM". His position matches UGC 1852 = PGC 9112.

400/500mm - 17.5" (1/20/90): very faint, very small, elongated NW-SE, smooth surface brightness. Forms a pair with NGC 903 1.5' NW. Second of six in a group.

Notes by Steve Gottlieb