Gaia BH1: Difference between revisions

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Revision as of 22:43, 30 September 2022

Gaia BH1
Observation data Epoch J2000 Equinox J2000
Constellation	Ophiuchus
Right ascension	17 28 41.09661
Declination	−00° 34′ 51.5234″
Characteristics
G-type star
Evolutionary stage	Main sequence
Spectral type	G
Apparent magnitude (G)	13.77
Black hole
Evolutionary stage	Stellar black hole
Astrometry

Radial velocity (R_v)	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)	185.63±0.05 d
Semi-major axis (a)	1.41±0.01 AU
Eccentricity (e)	0.454±0.005
Inclination (i)	126.3±0.4°
Longitude of the node (Ω)	97.0±1.1°
Periastron epoch (T)	2457387.1±0.8
Argument of periastron (ω) (secondary)	11.0±1.4°
Details
G-type 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	−0.2±0.05 dex
Rotational velocity (v sin i)	<3.5 km/s
Black hole
Mass	9.78±0.18 `M`_☉
Other designations
Gaia BH1, Gaia DR3 4373465352415301632
Database references

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 A0620-00.

Gaia BH1 was discovered in 2022 via astrometric observations with Gaia, and also observed via radial velocity. The discovery team found no astrophysical scenario that could explain the observed motion of the G-type star, other than a black hole. The system differs from "black hole impostors" such as LB-1 and HR 6819 in that the evidence for a black hole does not depend on the mass of the star or the inclination of the orbit, and there is no evidence of mass transfer. The discovery team also found a second system that is a candidate for containing a black hole, Gaia DR3 5870569352746779008, which was also reported by another team of astronomers.

The star and black hole orbit each other with a period of 185.63 days and an eccentricity of 0.45. The star is similar to the Sun, with about 0.93 M_☉ and 0.99 R_☉, and a temperature of about 5,850 K (5,580 °C; 10,070 °F), while the black hole has a mass of about 9.78 M_☉. Given this mass, the black hole's Schwarzschild radius should be about 29 kilometers.

References

"Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ El-Badry, Kareem; Rix, Hans-Walter; et al. (September 2022). "A Sun-like star orbiting a black hole". arXiv:2209.06833 .
Tanikawa, Ataru; Hattori, Kohei; et al. (September 2022). "Search for a Black Hole Binary in Gaia DR3 Astrometric Binary Stars with Spectroscopic Data". arXiv:2209.05632 .

Constellation of Ophiuchus

Stars

Bayer	α (Rasalhague) β (Cebalrai) γ (Muliphen) δ (Yed Prior) ε (Yed Posterior) ζ (Han) η (Sabik) θ ι κ λ (Marfik) μ ν ξ ο ρ σ τ υ φ χ ψ ω
Flamsteed	12 14 15 16 18 19 20 21 23 24 26 28 29 30 31 36 (A, Guniibuu) 37 38 41 43 44 (b) 45 (d, θ Tel) 47 Oph 50 51 (c) 52 53 (f) 54 58 61 66 67 68 70 (p) 71 72 73 74 24 Sco
Variable	U V X Y RS RV RZ ST SW TT TW UU WZ XX BF IX KK V380 V426 V438 V442 V445 V451 V453 V502 V508 V566 V567 V716 V839 V841 V849 V986 V1010 V1054 V2051 V2052 V2076 V2105 V2112 V2113 V2114 V2118 V2126 V2129 V2213 V2214 V2247 V2291 V2292 V2293 V2295 V2301 V2306 V2307 V2324 V2368 V2388 V2393 V2400 V2487 V2500 (Barnard's Star) V2502 V2540 V2542
HR	5989 5990 6041 6067 6096 6124 6136 6137 6140 6144 6179 6189 6190 6193 6201 6202 6235 6248 6269 6284 6294 6296 6302 6308 6329 6340 6350 6353 6354 6358 6359 6361 6365 6367 6372 6375 6387 6390 6404 6413 6428 6433 6435 6439 6441 6465 6472 6473 6474 6476 6489 6490 6494 6497 6504 6507 6512 6516 6520 6521 6524 6532 6534 6575 6577 6578 6590 6593 6601 6633 6639 6650 6659 6667 6670 6686 6689 6690 6696 6706 6719 6784 6797 6800 6851 6857 6883 6902 6925 6976 6985 6987 7010
HD	148390 148427 (Timir) 148531 149143 (Rosalíadecastro) 149382 150052 150381 150433 150493 152581 (Mahsati) 154088 156992 157172 160042 160346 164509 167162 170469 171028
Other	AS 239 BD-9 4395 CFHTWIR-Oph 98 CoRoT-6 CoRoT-25 CoRoT-26 DoAr 21 Elias 2-27 Gaia BH1 Gliese 673 GJ 1207 GJ 1214 (Okaria) GRS 1739-278 GX 1+4 GX 9+9 H 1705-250 Hen 3-1341 Great Annihilator IRAS 16293−2422 K2-32 LS IV-1 2 2MASS J16452211-1319516 MXB 1659-29 Oph-IRS 48 PG 1627-017 PSR B1929+10 TOI-677 Van Biesbroeck 8 VVV BD001 WISE 1800+0134 WISEP J180026.60+013453.1 Wolf 635 XTE J1739-285

Exoplanets	CFHTWIR-Oph 98 b CoRoT-6b 25b 26b GJ 1214 b (Enaiposha) HD 149143 b (Riosar) ν Ophiuchi b c

Star
clusters

NGC	6284 6287 6293 6304 6316 6325 6342 6355 6356 6366 6401 6426 6633
Other	IC 4665 Melotte 186 Messier 9 Messier 10 Messier 12 Messier 14 Messier 19 Messier 62 Messier 107 Palomar 6

Nebulae

NGC	6309 6572
Other	Dark Horse Double Helix Nebula Ophiuchus Superbubble Pipe Nebula Rho Ophiuchi cloud complex Serpens–Aquila Rift Snake Nebula

Galaxies

NGC	6240 6384 6509 6570
Other	NeVe 1 PKS 1741-03

Galaxy clusters	Ophiuchus Supercluster

Astronomical events	Kepler's Supernova

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