Édouard Stephan discovered NGC 6023 = St XII-77, along with NGC 6022, on 19 May 1881. His position is an exact match with UGC 10106.
400/500mm - 17.5" (5/13/88): faint, small, round, gradually increases to a brighter core. Brightest in AGC 2147 with NGC 6022 1.6' SSW.
Notes by Steve Gottlieb