Albert Marth discovered NGC 5104 = m 256 on 12 Apr 1864 and noted "F, S, lE." His position is within 1' of UGC 8391.
400/500mm - 18" (5/29/05): faint, small, elongated 2:1 ~N-S, 0.7'x0.3'. Contains a very small, brighter core. This is a an edge-on starburst galaxy.
Notes by Steve Gottlieb