Heinrich d'Arrest discovered NGC 4613, along with NGC 4614 and NGC 4615, on 9 May 1864 with the 11-inch refractor at Copenhagen. His single position is exactly 1' south of PGC 42570.

400/500mm - 17.5" (4/6/91): extremely faint, very small, round, weak concentration. Located 2.5' NNW of NGC 4614. Faintest of a trio.

600/800mm - 24" (6/1/13): faintest in a trio (KTG 45). At 282x appeared faint to fairly faint, small, round, 20" diameter. NGC 4615 lies 2.1' SE and NGC 4614 is 2.8' SSE.

Notes by Steve Gottlieb