John Herschel discovered NGC 4575 = h3403 on 8 Jun 1834 and recorded "F; pmE; 25" l, 15" br; follows 2 stars." His position and description matches ESO 322-036 = PGC 42181.

400/500mm - 17.5" (4/7/89): very faint, very elongated ~E-W. A mag 12 star is at the west end 1.0' from center and a mag 11.5 star is 1.6' SW of center. Member of the Centaurus cluster (AGC 3526).

Notes by Steve Gottlieb