A0620-00 (V616 Monocerotis, V616 Mon) is a low-mass X-ray binary star and black-hole candidate in the constellation of Monoceros.
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Evidence from observation
One of the components of the A0620-00 binary system is known to be a dark, compact stellar object, with a mass between nine and thirteen times the mass of the Sun. The other component is observed to be a K-type star (approximately 0.5 solar masses).
Significance
This binary system is located at a distance of approximately 3,000 light years, making the system the likely location of the nearest known black hole.
References
A0620-00 Wikipedia(Text) CC BY-SA