Heinrich d'Arrest discovered NGC 4585 = Sf 21 on 21 Apr 1865 with the 11-inch refractor at Copenhagen. His single micrometric position is an excellent match with CGCG 159-037 = PGC 42215 and he mentions the mag 10.3 star which follows by 27.3 sec in RA. Truman Safford independently discovered the galaxy on 16 May 1866.

400/500mm - 18" (4/10/04): faint, small, round, 25" diameter, low even surface brightness. Located 5.8' W of mag 10.3 SAO 82417.

Notes by Steve Gottlieb