A0620-00

A0620-00 (abbreviated from 1A 0620-00) is a binary star system in the constellation of Monoceros. A0620-00 consists of two objects. The first object is a K-type main-sequence star with a spectral type of K5 V. The second object cannot be seen, but based on its calculated mass of 6.6 M☉, it is too massive to be a neutron star and must therefore be a stellar-mass black hole. At a distance of about roughly 3,300 light-years (1,000 parsecs) away, this would make A0620-00 one of the nearest known black holes to the Solar System, closer than GRO J1655-40. The two objects orbit each other every 7.75 hours.

A0620-00

A0620-00 (abbreviated from 1A 0620-00) is a binary star system in the constellation of Monoceros. A0620-00 consists of two objects. The first object is a K-type main-sequence star with a spectral type of K5 V. The second object cannot be seen, but based on its calculated mass of 6.6 M☉, it is too massive to be a neutron star and must therefore be a stellar-mass black hole. At a distance of about roughly 3,300 light-years (1,000 parsecs) away, this would make A0620-00 one of the nearest known black holes to the Solar System, closer than GRO J1655-40. The two objects orbit each other every 7.75 hours.