Gaia BH1

Gaia BH1

Pan-STARRS image of Gaia BH1 (star at the center)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus[1]
Right ascension 17h 28m 41.09661s[2]
Declination −00° 34′ 51.5234″[2]
Characteristics
Sun-like star
Evolutionary stage Main sequence
Spectral type G[3]
Apparent magnitude (G) 13.77[3]
Black hole
Evolutionary stage Stellar black hole
Astrometry
Radial velocity (Rv)23.03±2.63[2] km/s
Proper motion (μ) RA: −7.70±0.020 mas/yr[3]
Dec.: −25.85±0.027 mas/yr[3]
Parallax (π)2.09 ± 0.02 mas[3]
Distance1,560 ± 10 ly
(478 ± 5 pc)
Orbit[3]
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[3]
Sun-like star
Mass0.93±0.05 M
Radius0.99±0.05 R
Luminosity (bolometric)1.06±0.04 L
Surface gravity (log g)4.55±0.16 cgs
Temperature5850±50 K
Metallicity [Fe/H]−0.2±0.05 dex
Rotational velocity (v sin i)<3.5 km/s
Black hole
Mass9.62±0.18 M
Other designations
Gaia BH1, Gaia DR3 4373465352415301632[3]
Database references
SIMBADdata

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.[4] As of May 2024, it is the nearest known system that astronomers are reasonably confident contains a black hole, followed by Gaia BH3, Gaia BH2 and A0620-00.[3][5]

  1. ^ "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
  2. ^ a b c Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h Cite error: The named reference El-Badry2022 was invoked but never defined (see the help page).
  4. ^ Overbye, Dennis (5 November 2022). "Astronomers Find a Black Hole in Our Cosmic Back Yard - Just 1,600 light-years away, the black hole is the closest known to Earth. The good news: It's dormant, at least for now". The New York Times. Retrieved 6 November 2022.
  5. ^ Cite error: The named reference NOIRLab2227 was invoked but never defined (see the help page).