Francis Leavenworth discovered NGC 1100 = LM 1-69 (along with NGC 1098 = I-67 and NGC 1099 = I-68) on 17 Oct 1885 with the 26" refractor at Leander McCormick Observatory. Ormond Stone's corrected position given in the IC 1 Notes is accurate and Herbert Howe also measured an accurate position in 1899-00 at the Chamberlin Observatory in Denver.

400/500mm - 17.5" (11/26/94): faint, fairly small, elongated 5:2 WSW-ENE, weak concentration. Similar appearance as NGC 1099 4.5' WSW. A mag 14 star is off the SE side 1.7' from the center and a mag 13 star is 2.3' NNE. About 9' N is pair of faint galaxies; NGC 1091 = HCG 21E and NGC 1092 = HCG 21D.

Notes by Steve Gottlieb