GRS 1915+105

GRS 1915+105 (V1487 Aquilae) is an X-ray binary in Aquila made of a main-sequence star and a black hole of 10 to 18 solar masses, about 11,000 parsecs away. Material falling onto the black hole drives a relativistic jet, making it a microquasar.

It was discovered on 15 August 1992 by the WATCH monitor on the Granat satellite. In 1994 it became the first known galactic source to show apparent superluminal motion, an effect of ejecta moving at about 90% of the speed of light.