Frank Muller discovered NGC 555 = LM 2-306, along with NGC 554 and 556, in 1886 with the 26" refractor at Leander McCormick Observatory. His position is 0.4 tmin west of ESO 476-012 = PGC 5419. Herbert Howe measured an accurate position in 1899-00 using the 20" refractor at Chamberlin Observatory (repeated in the IC 2 notes).

400/500mm - 17.5" (12/9/01): extremely faint, very small, round. In a small group with NGC 554 2' N and NGC 556 (not seen).

17.5" (11/6/93): extremely faint, very small, just glimpsed at moments though definitely visible. A mag 13 star is 1.5' ENE. Forms a close pair with NGC 554 2' N.

600/800mm - 24" (12/6/18): at 260x; faint, very small, round, 20" diameter, low even surface brightness. In a triplet with NGC 554 2.3' NNW and NGC 556 4' N. Located 15' ENE of mag 7.1 HD 8767.

Notes by Steve Gottlieb