Édouard Stephan discovered NGC 6159 = St X-30 on 20 Jul 1879. His position is accurate.

400/500mm - 17.5" (7/1/89): fairly faint, easy with direct vision, small, round, bright core. Collinear with mag 8.8 SAO 46092 5.4' W and a mag 11 star 2.6' W. Pair with CGCG 224-033 3.4' SE. The companion was very faint, very small, round, bright core, stellar nucleus.

Notes by Steve Gottlieb