Albert Marth discovered NGC 6576 = m 366, along with NGC 6577, 6579 and 6580, on 7 Aug 1864 and noted "eF, vS." His position is 1' too far north.
400/500mm - 17.5" (7/16/88): extremely faint, very small, round, weak concentration. Located 3.3' SW of NGC 6577 in the NGC 6579/6580 group.
Notes by Steve Gottlieb