Albert Marth discovered NGC 7521 = m 535, along with NGC 7524, on 18 Nov 1864 and noted "vF, pS, psbM." His position is accurate. See notes for N7524.

400/500mm - 17.5" (8/1/87): fairly faint, very small, round, very small bright core, stellar nucleus. NGC 7524 not seen 2.8' E. NGC 7517 lies 22' SSW. Located within the NGC 7556 group.

17.5" (7/20/90): similar appearance as earlier observation by NGC 7524 also observed.

Notes by Steve Gottlieb