Gaia BH1 (Gaia DR3 4373465352415301632) is a binary system consisting of a G-type main-sequence star and a likely stellar-mass black hole, located about 1,560 light-years (478 pc) away from the Solar System in the constellation of Ophiuchus.

[3] Given this mass, the black hole's Schwarzschild radius should be about 28 km (17 mi).

The discovery team found no astrophysical scenario that could explain the observed motion of the G-type star, other than a black hole.

The system differs from "black hole impostors" such as LB-1 and HR 6819 in that the evidence for a black hole does not depend on the mass of the star or the inclination of the orbit, and there is no evidence of mass transfer.

[7] The black hole was also independently detected by a second team, who found slightly different parameters.