J.L.E. Dreyer discovered NGC 4022 on 26 Apr 1878 in the last observation of the cluster from Birr Castle. He placed it approximately 6' in PA 144° from NGC 4018 (Kappa) and noted "pF, vS, stellar". On the final constructed diagram NGC 4022 is labeled "Lambda". The actual separation is 7' in PA 140°.

400/500mm - 17.5" (3/19/88): faint, small, slightly elongated, bright core. Contains a stellar nucleus or a star is superimposed. Member of the NGC 4007 group with NGC 4018 7.3' NW.

600/800mm - 24" (3/22/14): moderately bright, fairly small, round, small very bright core increases to the center. Two mag 13 stars lies 2.2' WSW and 2.4' WNW.

Notes by Steve Gottlieb