William Herschel discovered NGC 5093 = H III-633 = h1583 on 18 Mar 1787 (sweep 717) and noted "vF, S, lbM." CH's reduced position is 1.5' south of UGC 8373. JH logged "vF; R; bM; 12"."

400/500mm - 18" (5/30/03): fairly faint, fairly small, 0.6' diameter. Appears to have a large, prominent core with a very faint extensions increasing size to 0.9'x0.6'. Located 16' NNW of mag 5.6 23 CVn and 26' ESE of mag 4.7 20 CVn.

Notes by Steve Gottlieb