John Herschel discovered NGC 5091 = h3488 on 3 Jun 1834 and recorded "F; lE; The last of group; attached to the preceding one [NGC 5090]."

300/350mm - 13.1" (2/19/04 - Costa Rica): fairly faint, very elongated 4:1 NW-SE, ~1' in length and up to 1.4'x0.3' with averted vision. The major axis is collinear with the center of NGC 5090 just 1.4' NW! NGC 5082 lies 7' WNW.

Notes by Steve Gottlieb