Édouard Stephan discovered NGC 6351 = St X-33, along with NGC 6349, on 15 Jul 1879.
400/500mm - 17.5" (8/1/89): very faint, very small, slightly elongated ~N-S. Two very faint mag 15.5 stars are off the south edge. Forms a close pair with NGC 6349 0.9' W.
Notes by Steve Gottlieb