Albert Marth discovered NGC 5245 = m 266, along with NGC 5246, on 30 Apr 1864 and noted "vF, vS." His position is 2.4' south of CGCG 045-048 = PGC 48110. CGCG fails to label this galaxy as NGC 5245.

400/500mm - 17.5" (4/28/90): very faint, very small, irregularly round, almost even surface brightness. Located almost at the midpoint between two mag 13.5 stars 2.5' NNW and 3.1' SSE. NGC 5246 lies 12.5' N.

Notes by Steve Gottlieb