E.E. Barnard discovered IC 4566 on 20 Aug 1890 in a sextet (5 in IC) with the 12-inch refractor at Lick Observatory. He noted "faintish, round, gbM." and placed it accurately in his notebook sketch (published in 1906).

400/500mm - 17.5" (6/27/98): faint, small, elongated 4:3 NW-SE, 0.8'x0.6', weak concentration. Fourth of four on a line including IC 4564 3.0' WSW in a group of six galaxies.

Notes by Steve Gottlieb