Heinrich d'Arrest discovered NGC 4093 on 4 May 1864. Two nights earlier he discovered the pair NGC 4089 and 4091. His position, measured on 3 nights, CGCG 128-024= PGC 38323.

In his 1912 revision of WH's catalogues, Dreyer suggests H III-382 is NGC 4093. But more likely WH picked up NGC 4092, which is brighter.

400/500mm - 17.5" (5/14/88): very faint, very small, round, weak concentration. A mag 14 star is close off the NW edge 1.1' from center. Fourth of six in the field within the NGC 4065 cluster.

Notes by Steve Gottlieb