HD 22663 (y Eridani) is a candidate astrometric binary[6] star system in the equatorial constellation of Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.57.[2] Based upon an annual parallax shift of 14.2 mas,[1] it is located around 230 light years from the Sun. It is moving further away from the Earth with a heliocentric radial velocity of +11.5 km/s,[4] having come within 140.9 ly some 3.76 million years ago.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 03h 37m 05.67915s[1] |
| Declination | −40° 16′ 28,7408″[1] |
| Apparent magnitude (V) | 4.57[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| B−V color index | 1.023±0.028[2] |
| Astrometry | |
| Radial velocity (Rv) | +11.50±0.02[4] km/s |
| Proper motion (μ) | RA: −13.342 mas/yr Dec.: −12.219 mas/yr |
| Parallax (π) | 14.1588 ± 0.3283 mas[1] |
| Distance | 230 ± 5 ly (71 ± 2 pc) |
| Absolute magnitude (MV) | +0.32[2] |
| Details[4] | |
| Mass | 1.43±0.25 M☉ |
| Radius | 13.01±0.54 R☉ |
| Luminosity | 95.5+16.7 −14.2 L☉ |
| Surface gravity (log g) | 2.75±0.01 cgs |
| Temperature | 4,660±21 K |
| Metallicity [Fe/H] | −0.15±0.05 dex |
| Rotational velocity (v sin i) | 1.40±0.55 km/s |
| Age | 2.58±1.22 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The visible component is an orange-hued giant star with a stellar classification of K1 III,[3] having exhausted the hydrogen at its core and evolved away from the main sequence. It has an estimated 1.4 times the mass of the Sun and has expanded to 13 times the Sun's radius. At the age of 2.6 billion years, this star is radiating 96 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,660 K.[4]
References
edit- ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
- ^ a b c d e 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 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ a b c d 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.
- ^ "HD 22663". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-20.
- ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.