2MASS J22132050-5137385
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Grus |
| Right ascension | 22h 13m 20.4895s[1] |
| Declination | −51° 37′ 38.689″[1] |
| Apparent magnitude (V) | 11.630[2] |
| Astrometry | |
| Radial velocity (Rv) | 117.5 ± 0.3[3] km/s |
| Proper motion (μ) | RA: 7.012[1] mas/yr Dec.: −17.524[1] mas/yr |
| Parallax (π) | 0.4647±0.0186 mas[1] |
| Distance | 7,000 ± 300 ly (2,150 ± 90 pc) |
| Details[3] | |
| Surface gravity (log g) | 2.28 ± 0.06 cgs |
| Temperature | 5,509 K |
| Metallicity [Fe/H] | 2.20 ± 0.12 dex |
| Other designations | |
| TYC 8444-76-1[2] | |
| Database references | |
| SIMBAD | data |
2MASS J22132050-5137385 is a contender for the oldest star in the known universe, with an approximated age of 13.6 ± 2.6 billion years. It is located within the Milky Way galaxy, between 6,230 and 6,820 light years away from Earth in the constellation of Grus. It has a mass 0.80 ± 0.08 that of the Sun.[3] Due to its age, it is likely among the first stars from reionization (the stellar dawn), ending the Dark Ages about 370,000 years after the Big Bang.[4]
References
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b "2MASS J22132050-5137385". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-04-05.
- ^ a b c Roederer, Ian U.; Beers, Timothy C.; Hattori, Kohei; Placco, Vinicius M.; Hansen, Terese T.; Ezzeddine, Rana; Frebel, Anna; Holmbeck, Erika M.; Sakari, Charli M. (2024-08-01). "The R-Process Alliance: 2MASS J22132050–5137385, the Star with the Highest-known r-process Enhancement at [Eu/Fe] = +2.45". The Astrophysical Journal. 971 (2): 158. arXiv:2406.02691. Bibcode:2024ApJ...971..158R. doi:10.3847/1538-4357/ad57bf. ISSN 0004-637X.
- ^ Roederer, Ian (February 2024). "The most highly r-process-enhanced star known reveals new insight into the dilution and yields of r-process material in the early universe". American Astronomical Society Meeting Abstracts. 243 (2): 350.05. Bibcode:2024AAS...24335005R.