Édouard Stephan discovered NGC 913 = St X-9 on 30 Oct 1878 with the 31" reflector at the Marseille Observatory and noted "eeF, eS, lbM". His position matches PGC 9230 (not in UGC, MCG or CGCG). Except for NGC 898 and NGC 923 (discovered by WH), Stephan discovered all the NGC galaxies in the cluster on the same night.

300/350mm - 13.1" (10/20/84): extremely faint and small, round. Located 3.5' ESE of NGC 910 in the core of AGC 347. Forms a close pair with NGC 912 1.3' S.

13.1" (11/13/82): extremely faint and requires averted to glimpse, nonstellar knot.

600/800mm - 24" (11/23/19): at 375x; faint, fairly small, elongated 2:1 SW-NE, 30"x15", low even surface brightness. Forms a pair with NGC 912 1.4' S. Situated 3.7' SE of NGC 910 in the core of AGC 347.

Notes by Steve Gottlieb