Heinrich d'Arrest discovered NGC 3820 on 29 Apr 1865 and accurately placed it 2' north of h950 = NGC 3819.
400/500mm - 17.5" (4/25/87): extremely faint, small, almost round, diffuse, even surface brightness. Located 2.0' N of NGC 3819 and 5.5' NNE of NGC 3817. Third of five (and faintest) in HCG 58.
Notes by Steve Gottlieb