Heinrich d'Arrest discovered NGC 5456 on 7 Feb 1862 with the 11-inch refractor at Copenhagen. His mean position (measured on two sweeps) matches UGC 9004.
400/500mm - 17.5" (6/14/96): faint, small, roundish, 30" diameter, broad weak concentration. A mag 14 star lies 1.0' NE and a mag 15 star 1.8' ENE.
Notes by Steve Gottlieb