William Herschel discovered NGC 7510 = H VII-44 = h2213 on 3 Nov 1787 (sweep 773) and recorded "a cl of compressed pL stars, considerably rich, E, the stars arranged in lines." On 29 Sep 1829 (sweep 213), JH logged "a very pretty fan-shaped cluster of pB close stars in two lines with other small to N. A * 10m taken. Another 11m dist 19 seconds; pos = 244°."

300/350mm - 13" (9/9/83): striking at 62x, about two dozen stars in a wedge-shape elongated SW-NE. Compact cluster Mrk 50 and HII region LBN 11 is ~30' ESE.

400/500mm - 17.5" (10/17/98): very pretty triangular wedge of stars in a 5x2' group. There are brighter stars at the west and east vertex with the brightest star at the following end. Within the triangle are two dozen stars oriented SW-NE including a number of mag 14-15 stars on the eastern side. Just following the main grouping are another 8 or 9 stars that may be part of the cluster. Picked up while viewing nearby Sh2-157.

Notes by Steve Gottlieb