Frank Muller discovered NGC 2584 = LM 2-403 in 1886 and recorded "mag 14.0, 0.5' dia, R, 2nd of 4 [with NGC 2583, 2585, 2586]." There is nothing at his position, but 1.0 min of RA west is MCG -01-22-009 = PGC 23523. Kobold measured an accurate position at Strasbourg in 1895. MCG doesn't label this galaxy NGC 2584.

400/500mm - 17.5" (1/12/02): very faint, small, slightly elongated N-S, low surface brightness. Second of three with NGC 2583 2.7' SW and NGC 2585 4.3' NE.

17.5" (4/6/91): extremely faint, small, slightly elongated N-S, very low surface brightness. Collinear with NGC 2583 2.5' SW and NGC 2585 5' NE.

600/800mm - 24" (2/16/15): fairly faint, fairly small, elongated 2:1 N-S, 0.6'x0.3', very weak concentration. Second in a string with NGC 2583 2.7' SW and NGC 2585 4.3' NE. Also MCG -01-22-007 and -006 are nearly in a line 2.9' and 4.1' NW.

Notes by Steve Gottlieb