Édouard Stephan discovered NGC 909 = St X-6 on 30 Oct 1878 with the 31" reflector at the Marseille Observatory and reported "eF, vS, stellar nucl". His position matches UGC 1872 = PGC 9197.

300/350mm - 13.1" (10/20/84): fairly faint, very small, round, compact. Located 4' ENE of a mag 9.5 star. Forms a pair with NGC 906 in the core of AGC 347.

13.1" (11/13/82): faint, just south of NGC 906.

600/800mm - 24" (11/23/19): at 375x; between fairly faint and moderately bright, fairly small, round, 30" diameter, gradually increases to a brighter core and nucleus. A mag 9.8 star is 2.4' SW and a mag 9.2 star is 4' W. In the core of the cluster AGC 347 with NGC 906 3.5' NNW.

Notes by Steve Gottlieb