Heinrich d'Arrest discovered NGC 4084 on 26 Apr 1865 with the 11-inch refractor at Copenhagen. His position, measured on two nights, matches CGCG 128-017 = PGC 38272 and he accurately place a mag 13 star that precedes by 2 seconds of time and 3' north.

400/500mm - 17.5" (5/14/88): fairly faint, very small, round, bright core, faint stellar nucleus. Located less than 1° north of the NGC 4065 cluster.

Notes by Steve Gottlieb