HD 186302

HD 186302 (also designated HIP 97507)^[9] is a star in the constellation of Pavo. It is 185 light-years (57 parsecs) away from Earth, with an apparent magnitude of 8.76.^[9] It was identified in November 2018 as a potential solar sibling to the Sun. Similar in spectrum and size, it was suspected to have formed in the same stellar nursery as the Sun 4.6 billion years ago.^[10] However, a common origin with the Sun was found to be unlikely in a 2019 paper, as HD 186302's galactic orbit is very different from the Sun's.^[11]

HD 186302

Location of HD 186302 (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Pavo
Right ascension	19h 49m 06.43036s[1]
Declination	−70° 11′ 16.7033″[1]
Apparent magnitude (V)	8.76±0.01[2]
Characteristics
Spectral type	G3/5 V[3]
B−V color index	0.67[4]
Astrometry
Radial velocity (Rv)	−1.3±0.3[5] km/s
Proper motion (μ)	RA: −24.004[1] mas/yr Dec.: −38.804[1] mas/yr
Parallax (π)	17.6309 ± 0.0147 mas[1]
Distance	185.0 ± 0.2 ly (56.72 ± 0.05 pc)
Absolute magnitude (MV)	+5.11[6]
Details[7]
Mass	0.97±0.01 M☉
Radius	0.95±0.01 R☉
Surface gravity (log g)	4.47±0.01 cgs
Temperature	5,675±15 K
Metallicity [Fe/H]	−0.03[8] dex
Rotational velocity (v sin i)	2.30[8] km/s
Age	4.5±0.81 Gyr
Other designations
HD 186302, HIP 97507, 2MASS J19490644-7011167, CD−70°1724
Database references
SIMBAD	data

See also

• HD 162826; the first star identified as a solar sibling in February 2014,^[12] in Hercules.

References

1. 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.
2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
3. Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode:1975mcts.book.....H.
4. Gomes Da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; De Laverny, P.; Recio-Blanco, A.; Lovis, C. (2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity". Astronomy and Astrophysics. 646: A77. arXiv:2012.10199. Bibcode:2021A&A...646A..77G. doi:10.1051/0004-6361/202039765. S2CID 242898977.
5. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
6. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
7. Adibekyan, V.; De Laverny, P.; Recio-Blanco, A.; Sousa, S. G.; Delgado-Mena, E.; Kordopatis, G.; Ferreira, A. C. S.; Santos, N. C.; Hakobyan, A. A.; Tsantaki, M. (2018). "The AMBRE project: Searching for the closest solar siblings". Astronomy and Astrophysics. 619: A130. arXiv:1810.01813. Bibcode:2018A&A...619A.130A. doi:10.1051/0004-6361/201834285. S2CID 119202092.
8. Llorente de Andrés, F.; Chavero, C.; de la Reza, R.; Roca-Fàbrega, S.; Cifuentes, C. (October 2021). "The evolution of lithium in FGK dwarf stars". Astronomy & Astrophysics. 654: A137. arXiv:2108.05852. Bibcode:2021A&A...654A.137L. doi:10.1051/0004-6361/202141339. eISSN 1432-0746. ISSN 0004-6361.
9. "HD 186302". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 24, 2018.
10. Matt Williams (2018-11-21). "Astronomers Find One of the Sun's Sibling Stars. Born From the Same Solar Nebula Billions of Years Ago". Universe Today. Retrieved 2022-10-07.
11. Leung, Henry W.; MacKereth, J Ted; Hunt, Jason A S.; Portegies Zwart, Simon; Bovy, Jo; Price-Jones, Natalie; Webb, Jeremy J. (2020). "Searching for solar siblings in APOGEE and Gaia DR2 with N-body simulations". Monthly Notices of the Royal Astronomical Society. 494 (2): 2268–2279. arXiv:1910.01646. Bibcode:2020MNRAS.494.2268W. doi:10.1093/mnras/staa788.
12. Batista, S. F. A.; Adibekyan, V. Zh.; Sousa, S. G.; Santos, N. C.; Delgado Mena, E.; Hakobyan, A. A. (2014), "Searching for solar siblings among the HARPS data", Astronomy & Astrophysics, 564: A43, arXiv:1403.1506, Bibcode:2014A&A...564A..43B, doi:10.1051/0004-6361/201423645, S2CID 56197806