Heinrich d'Arrest discovered NGC 7548 = Au 50 on 30 Sep 1861 with the 11-inch Merz refractor at Copenhagen. He noted a faint star (called mag 16 and mag 17 on his two observations) preceded by 11 seconds of time. The star is exactly where he placed it, though closer to mag 13.5. The discovery was early enough to be included in Auwers' 1862 list of 50 new nebulae.

400/500mm - 17.5" (9/23/89): faint, small, slightly elongated, broad concentration. Located 23' SSE of mag 6.7 SAO 91126.

Notes by Steve Gottlieb