Heinrich d'Arrest discovered NGC 4906 on 6 Apr 1864 with the 11-inch refractor at Copenhagen. His position (measured twice) matches CGCG 160-253 = PGC 44799 and he noted the mag 14-15 star that precedes by 25" (d'Arrest gives the separation as 17" to the edge).

400/500mm - 17.5" (4/21/90): very faint, very small, round. A mag 14 star is just 25" W of center. Located 7.6' SE of NGC 4889 in the core of AGC 1656. IC 4041 lies 4.4' due north and IC 4042 2.9' NNE.

Notes by Steve Gottlieb