William Herschel discovered NGC 5392 = H III-666 = h1720 on 15 Apr 1787 (sweep 730) and noted "eF, vS." There is nothing at his position, but exactly 1.0 tmin west is CGCG 018-013 = PGC 49792. JH logged "F; S; R: gbM; 20"." and measured an accurate position used in the GC and NGC. The RNGC RA is exactly 2.0 tmin too large (probably a typo).

400/500mm - 17.5" (5/11/96): fairly faint, fairly small, elongated 3:2 SW-NE, 1.0'x0.6', brighter core. Only faint stars in surrounding field. Incorrect RA in the RNGC (2.0 time-min E).

Notes by Steve Gottlieb