Английская Википедия:Gaia BH2
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Gaia BH2 (Gaia DR3 5870569352746779008) is a binary system consisting of a red giant and what is very likely a stellar-mass black hole. Gaia BH2 is located about 3,800 light years away (Шаблон:Val away) in the constellation of Centaurus, making it Шаблон:As of the second-closest known black hole system to Earth. Gaia BH2 is the second black hole discovered from Gaia DR3 astrometric data, and Gaia BH1 and BH2 are likely the only black hole binaries which will be detected from Gaia DR3 data.[1]
The black hole and red giant orbit the system barycentre every 1,277 days, or around 3.5 years, with a moderate eccentricity of 0.518. The black hole's mass is around Шаблон:Solar mass, which means its Schwarzschild radius should be about Шаблон:Convert. The red giant has a mass of Шаблон:Solar mass and a radius of Шаблон:Solar radius. Its temperature is estimated at Шаблон:Convert.[1]
Discovery
Gaia BH2 was originally discovered as a black hole binary candidate in 2022, found via astrometric observations with Gaia, along with Gaia BH1. At that time it was not clear if Gaia BH2 did definitely harbour a black hole, but it was the only plausible candidate in the Gaia data other than Gaia BH1.[2][3] Later radial velocity observations confirmed this black hole system and refined its orbital parameters.[1]
References
