Lewis Swift discovered NGC 7509 = Sw. IV-91 on 8 Aug 1886 with his 16-inch refractor and recorded "vF; S; R: bet 2 stars." His position is 7 seconds of RA west and 1' north of CGCG 431-013. The 2 stars might be a mag 9.5 star 5' northeast and a mag 9.9 star 5' south or refer to two fainter but closer stars.

400/500mm - 17.5" (9/23/89): faint, small, slightly elongated E-W, weak gradual concentration.

Notes by Steve Gottlieb