Gaia BH1
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. As of 2022, it is the nearest known system that astronomers are reasonably confident contains a black hole, followed by Gaia BH2 and A0620-00.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 17h 28m 41.09661s |
| Declination | −00° 34′ 51.5234″ |
| Characteristics | |
| Sun-like star | |
| Evolutionary stage | Main sequence |
| Spectral type | G |
| Apparent magnitude (G) | 13.77 |
| Black hole | |
| Evolutionary stage | Stellar black hole |
| Astrometry | |
| Radial velocity (Rv) | 23.03±2.63 km/s |
| Proper motion (μ) | RA: −7.70±0.020 mas/yr Dec.: −25.85±0.027 mas/yr |
| Parallax (π) | 2.09 ± 0.02 mas |
| Distance | 1,560 ± 10 ly (478 ± 5 pc) |
| Orbit | |
| Period (P) | 185.59±0.05 d |
| Semi-major axis (a) | 1.40±0.01 AU |
| Eccentricity (e) | 0.451±0.005 |
| Inclination (i) | 126.6±0.4° |
| Longitude of the node (Ω) | 97.8±1.0° |
| Periastron epoch (T) | 2457387.9±0.7 |
| Argument of periastron (ω) (secondary) | 12.8±1.1° |
| Details | |
| Sun-like star | |
| Mass | 0.93±0.05 M☉ |
| Radius | 0.99±0.05 R☉ |
| Luminosity (bolometric) | 1.06±0.04 L☉ |
| Surface gravity (log g) | 4.55±0.16 cgs |
| Temperature | 5850±50 K |
| Metallicity [Fe/H] | −0.2±0.05 dex |
| Rotational velocity (v sin i) | <3.5 km/s |
| Black hole | |
| Mass | 9.62±0.18 M☉ |
| Other designations | |
Gaia BH1, Gaia DR3 4373465352415301632 | |
| Database references | |
| SIMBAD | data |
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