William Herschel discovered NGC 2124 = H III-225 on 20 Oct 1784 (sweep 304) and noted "eF, E, resolvable, near 1' long. Verified 240 power." Auwer's reduction places his position is 2.4' NW of ESO 555-016 = PGC 18147. Herbert Howe, observing with the 20" refractor at the Chamberlain Observatory, commented "F,S; not eeF as in WH's description".

400/500mm - 17.5" (12/3/88): moderately bright, fairly small, elongated 2:1 N-S, broadly concentrated halo. A mag 15 star is at the south edge. Located in a rich star field.

Notes by Steve Gottlieb