Heinrich d'Arrest discovered NGC 4828 on 22 Apr 1865 with the 11-inch refractor at Copenhagen. His single position is accurate. d'Arrest's mentioned there are others nearby to the southwest -- so perhaps he noticed NGC 4817, although it was not measured.

400/500mm - 18" (5/12/07): very faint and small, round, 20" diameter. Located on the west side of AGC 1656 about 45' W of the core. Forms a similar pair with NGC 4817, located 5.6' SW.

Notes by Steve Gottlieb