William Herschel discovered NGC 2493 = H III-750 = h476 on 31 Dec 1788 (sweep 901) and noted "vF, S, R, lbM." His position matches UGC 4150 = PGC 22447. John Herschel recorded on 18 Mar 1831 (sweep 335), "pB even though there is moon enough to see the wires well. R; gb and then sbM; 20"."

400/500mm - 17.5" (2/24/90): moderately bright, fairly small, round, halo gradually increases to a small bright core. Located 9' SW of mag 7.6 SAO 42123. Forms a close pair with a dim galaxy NGC 2495 1.8' ENE. This galaxy forms the southern vertex of an isosceles triangle with a mag 9.5 star 5' WNW and a mag 10 star 4.5' NNW.

Notes by Steve Gottlieb