John Herschel discovered NGC 2108 = h2970 on 16 Dec 1835 and described as "eF; pL; 1E." His position is accurate. Herschel gave an uncertain (??) equivalence with D 153, which James Dunlop described as "a faint small round nebula, 15" diameter." His position is 7.4' NW of the cluster, so this identification is within his typical errors, though the Glen Cozens doesn't make this equivalence.

400/500mm - 18" (7/8/02 - Magellan Observatory, Australia): picked up while viewing NGC 2100 located 10' WSW. At 171x NGC 2108 appeared as a fairly faint knot, ~1 diameter with no resolution. A mag 10 star is 5' SW.

Notes by Steve Gottlieb