Albert Marth discovered NGC 7518 = m 533 on 29 Aug 1863 and noted "vF, S, R." His position is accurate.

400/500mm - 17.5" (11/1/86): faint, fairly small, diffuse, very slightly elongated, small weak concentration. Observation in poor seeing.

600/800mm - 24" (1/1/16): fairly faint to moderately bright, fairly small, slightly elongated NW-SE, 30"x24", small brighter nucleus. Forms a pair with superthin UGC 12433 (axial ratio 10:1), located 6.6' due north. Outlying member of the Pegasus I cluster.

UGC 12423 appeared very faint, very thin streak at least 8:1 NW-SE, ~1.5'x10", very small brighter nucleus. The southeast extension was longer than the northwest. Situated directly between a mag 10.8 star 2.3' SW and a mag 12.7 star 1.8' NE.

Notes by Steve Gottlieb