HD 110458 is a single[9] star in the southern constellation of Centaurus. It has the Bayer designation w Centauri, while HD 110458 is the star's identifier in the Henry Draper Catalogue. The star has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.66.[2] It is located at a distance of approximately 191 light years from the Sun based on parallax,[1] but is drifting closer with a radial velocity of −12 km/s.[2] Based on its space motion, in 1972 O. J. Eggen listed it as a probable member of the Hyades group.[10]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 12h 42m 35.45s[1] |
| Declination | −48° 48′ 47.2″[1] |
| Apparent magnitude (V) | +4.66[2] |
| Characteristics | |
| Spectral type | K0III[3][4] |
| U−B color index | +1.01 |
| B−V color index | +1.09 |
| Astrometry | |
| Radial velocity (Rv) | −11.7±0.8[2] km/s |
| Proper motion (μ) | RA: −123.84±0.16[1] mas/yr Dec.: −30.17±0.13[1] mas/yr |
| Parallax (π) | 17.11 ± 0.22 mas[1] |
| Distance | 191 ± 2 ly (58.4 ± 0.8 pc) |
| Absolute magnitude (MV) | +0.99±0.028[5] |
| Details | |
| Mass | 1.71[6] M☉ |
| Radius | 11.61+0.23 −0.19[7] R☉ |
| Luminosity | 60.8±2.0[7] L☉ |
| Surface gravity (log g) | 2.61[5] cgs |
| Temperature | 4,682±26[6] K |
| Metallicity [Fe/H] | 0.19[5] dex |
| Age | 2.61[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The stellar classification of HD 110458 is K0III,[3][4] which indicates this is an aging giant star that has exhausted the supply of hydrogen at its core. It is estimated to be 2.6[6] billion years old with 1.7[6] times the mass of the Sun and has expanded to 11.6[7] times the girth of the Sun. The star is radiating 61[7] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,682 K.[6]
References
edit- ^ a b c d e f Van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ 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 Houk, N. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ a b Cohen, Martin; et al. (April 1999), "Spectral Irradiance Calibration in the Infrared. X. A Self-Consistent Radiometric All-Sky Network of Absolutely Calibrated Stellar Spectra", The Astronomical Journal, 117 (4): 1864–1889, Bibcode:1999AJ....117.1864C, doi:10.1086/300813.
- ^ a b c Park, Sunkyung; et al. (2013), "Wilson-Bappu Effect: Extended to Surface Gravity", The Astronomical Journal, 146 (4): 73, arXiv:1307.0592, Bibcode:2013AJ....146...73P, doi:10.1088/0004-6256/146/4/73, S2CID 119187733.
- ^ a b c d e f Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114, 88.
- ^ 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. Gaia DR2 record for this source at VizieR.
- ^ "HD 110458". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-28.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Eggen, O. J. (June 1972), "The red giants in the Hyades group", Publications of the Astronomical Society of the Pacific, 84: 406, Bibcode:1972PASP...84..406E, doi:10.1086/129303.