GRS 1915+105
Star system
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GRS 1915+105 or V1487 Aquilae is an X-ray binary star system which features a regular star and a black hole. It was discovered on August 15, 1992 by the WATCH all-sky monitor aboard Granat. "GRS" stands for "GRANAT source", "1915" is the right... Wikipedia
Distance: 28,000 ly; (8,600+2,000; −1,600 pc)
Mass: 12.4+2.0; −1.8 M☉