Heinrich d'Arrest discovered NGC 4320 on 15 Apr 1865 with the 11-inch refractor at Copenhagen. His position, measured on 4 nights, matches UGC 7452 and he mentions the mag 15 star (called mag 17) which precedes by 5.6 sec of RA. In the IC 2 Notes section, Dreyer mentions that Frost was unable to identify this galaxy on a Harvard plate of 4 hours exposure, although it was included in Adelaide Ames' 1930 "A Catalogue of 2778 Nebulae, including the Coma-Virgo Group", based on plates taken with the Bruce astrograph at Arequipa.

400/500mm - 17.5" (3/24/90): very faint, very small, round, bright core. Forms a pair with NGC 4325 4.9' NNE.

Notes by Steve Gottlieb