HD 23319 (h Eridani) is an orange-hued star in the constellation Eridanus. It has an apparent visual magnitude of 4.59,[2] which is sufficiently bright to make it visible to the naked eye. The distance to HD 23319 can be estimated from its annual parallax shift of 18.5 mas,[1] which yields a range of about 176 light years. It is moving further away from the Earth with a heliocentric radial velocity of +9.9 km/s.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 03h 42m 50.0549s[1] |
| Declination | −37° 18′ 48.661″[1] |
| Apparent magnitude (V) | 4.59[2] |
| Characteristics | |
| Spectral type | K1.5 IIIb CN0.5[3] |
| B−V color index | 1.191±0.002[2] |
| Astrometry | |
| Radial velocity (Rv) | +9.90±0.07[4] km/s |
| Proper motion (μ) | RA: −91.264(70) mas/yr[1] Dec.: −70.315(85) mas/yr[1] |
| Parallax (π) | 18.5379 ± 0.0757 mas[1] |
| Distance | 175.9 ± 0.7 ly (53.9 ± 0.2 pc) |
| Absolute magnitude (MV) | 0.83[2] |
| Details | |
| Mass | 1.42±0.09[5] M☉ |
| Radius | 11.38±0.07[5] R☉ |
| Luminosity | 51.52±0.67[5] L☉ |
| Surface gravity (log g) | 2.56±0.05[5][4] cgs |
| Temperature | 4,592±14[5] K |
| Metallicity [Fe/H] | +0.03±0.06[5][4] dex |
| Rotational velocity (v sin i) | 1.70±0.43[4] km/s |
| Age | 3.17±0.42[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an aging giant star with a stellar classification of K1.5 IIIb CN0.5,[3] where the suffix notation indicates the spectrum shows a mild overabundance of the cyano radical. It is a red clump giant, indicating it is on the horizontal branch and is generating energy through helium fusion at its core.[7] The star has 1.4 times the mass of the Sun and, at the age of 3.2 billion years, has expanded to 11 times the Sun's radius. It is radiating 51 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,592 K.[5]
References
edit- ^ a b c d e 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.
- ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
- ^ a b c d e Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; de la Villarmois, E. Artur.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, S2CID 53666931.
- ^ a b c d e f g h Gallenne, A.; Pietrzyński, G.; Graczyk, D.; Nardetto, N.; Mérand, A.; Kervella, P.; Gieren, W.; Villanova, S.; Mennickent, R. E.; Pilecki, B. (2018-08-01), "Fundamental properties of red-clump stars from long-baseline H-band interferometry", Astronomy & Astrophysics, 616: A68, arXiv:1806.09572, doi:10.1051/0004-6361/201833341, ISSN 0004-6361
- ^ "HD 23319". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-21.
- ^ Laney, C. D.; et al. (2012), "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars", Monthly Notices of the Royal Astronomical Society, 419 (2): 1637, arXiv:1109.4800, Bibcode:2012MNRAS.419.1637L, doi:10.1111/j.1365-2966.2011.19826.x, S2CID 117788450.