Francis Leavenworth discovered NGC 583 = LM 2-308 in 1886 with the 26" refractor at Leander McCormick Observatory. His typical poor position is 1 min of RA east of ESO 542-020 = PGC 5576. Herbert Howe measured an accurate position in 1899-00 using the 20" refractor at Chamberlin Observatory (repeated in the IC 2 notes). MCG (-03-04-077) does not equate their entry with NGC 583.

400/500mm - 17.5" (10/21/95): very faint, very small, round, 30" diameter, very weak concentration with no distinct core. A mag 12 star is 1.5' NW of center.

Notes by Steve Gottlieb