Heinrich d'Arrest discovered NGC 2591 on 12 Aug 1866 and noted "F, S, E, 45"-55" dia, lbM." His position from 2 observations (#80 in his discovery list in AN 1500) is an exact match with UGC 4472.

400/500mm - 17.5" (2/1/92): faint, narrow edge-on 6:1 SW-NE, 2.4'x0.4', brighter middle, very thin faint extensions. A mag 14 star is just off the SW tip 1.4' from center.

Notes by Steve Gottlieb