Albert Marth discovered NGC 631 = m 50 on 27 Oct 1864 with Lassell's 48" on Malta and noted "vF, S, gbM." His position matches UGC 1153 = PGC 5983.
400/500mm - 17.5" (12/18/89): faint, small, round, smoothly increases to small bright core. Forms a pair with NGC 632 8' ENE.
Notes by Steve Gottlieb