DeLisle Stewart discovered IC 4766 = DS 512 on a plate taken 20 Jul 1901 at Harvard's Arequipa Station in Peru. He noted "eF, eS, bM."

600/800mm - 30" (10/12/15 - OzSky): at 303x; moderately bright, fairly small, elongated 5:3 WNW-ESE, 45"x27". This member of the ACO S805 (IC 4765) cluster is situated 1.6' ENE of a mag 12 star and 3.2' NE of(IC 4765.

Notes by Steve Gottlieb