Heinrich d'Arrest discovered NGC 528, which was missed by both Herschels, on 22 Aug 1865 with the 11-inch refractor at Copenhagen. His single position is quite accurate.

In March 2020, Yann Pothier found that Bindon or George Stoney made an earlier discovery on 7 Nov 1850. A diagram in the 1880 publication shows two nebulae with distances to nearby stars. Although the orientation for west is off (it should be down) the separations are a perfect match with NGC 513 (discovered by William Herschel) and NGC 528. A later observation on 27 Nov 1857 by R.J. Mitchell mentions a similar diagram was made, so NGC 528.was seen twice at Birr Castle before d'Arrest's observation. Dreyer questioned if the two nebulae were novae but he wasn't left with any positions, so d'Arrest was credited in the NGC.

300/350mm - 13.1" (8/8/86): fairly faint, small, slightly elongated SW-NE, bright core. There is a string of mag 10 stars to the north including two mag 10.5 stars 3.6' NNW and 7.6' NE and a mag 9.5 star 5.6' NNE. Two bright stars lie SE including a mag 10 star 6' SSE.

Notes by Steve Gottlieb