Heinrich d'Arrest discovered NGC 525 on 25 Sep 1862 with the 11-inch refractor at Copenhagen. His mean position (2 observations) is fairly accurate and also noted the nearby mag 11-12 star (2' northwest) as 5 seconds preceding and 1.5' north.

300/350mm - 13.1" (8/24/84): faint, small, almost round.

400/500mm - 17.5" (10/17/87): faint, very small, slightly elongated, weak concentration. Located 2' SE of a mag 10.5 star in the NGC 524 group.

Notes by Steve Gottlieb