John Herschel discovered NGC 6392 = h3691 on 17 Jun 1835 and logged "pF; S; R; glbM; 20"; 50 stars in field." His position (measured on two nights) matches ESO 070-012 = PGC 60753. RNGC classifies the number as an unverified southern object, though the identification is certain.

600/800mm - 25" (4/5/16 - Coonabarabran, 318x): fairly bright, fairly small, round, 45" diameter, the surface brightness is fairly high and irregular (probably due to a superimposed mag 15.5 star on the southeast side). A mag 13 star is 50" WSW of center and a mag 15 star is at the southwest edge [20" from center]. Situated in a rich Apus star field with a mag 8.8 star 7' ESE.

Notes by Steve Gottlieb