Astronomy:HD 125442
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Short description: Star in the constellation Lupus
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lupus[1] |
| Right ascension | 14h 20m 42.58071s[2] |
| Declination | −45° 11′ 13.4190″[2] |
| Apparent magnitude (V) | 4.78[1] |
| Characteristics | |
| Spectral type | F0 IV[3] |
| B−V color index | 0.310±0.003[1] |
| Astrometry | |
| Radial velocity (Rv) | +0.0±3.7[4] km/s |
| Proper motion (μ) | RA: +37.33[5] mas/yr Dec.: −72.81[5] mas/yr |
| Parallax (π) | 22.1448 ± 0.3265[2] mas |
| Distance | 147 ± 2 ly (45.2 ± 0.7 pc) |
| Absolute magnitude (MV) | 1.49[6] |
| Details | |
| Mass | 1.58[7] M☉ |
| Radius | 2.95[7] R☉ |
| Luminosity | 20.2[7] L☉ |
| Surface gravity (log g) | 3.97[7] cgs |
| Temperature | 7,123[7] K |
| Rotational velocity (v sin i) | 148±10[6] km/s |
| Age | 614[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 125442 is a single[10] star in the southern constellation of Lupus. Its apparent visual magnitude is 4.78,[1] which can be seen with the naked eye. The distance to HD 125442, as determined from its annual parallax shift of 22.1 mas,[2] is 147 light years.
This is an F-type subgiant star with a stellar classification of F0 IV,[3] having, at the age of 614 million years,[8] used up the hydrogen at its core and begun the process of evolving into a giant star. It has 1.6 times the mass of the Sun and is radiating 20 times the Sun's luminosity from its photosphere at an effective temperature of 7,123 K.[7] The star displays a high rate of spin with a projected rotational velocity of 148 km/s.[6]
References
- ↑ 1.0 1.1 1.2 1.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 3.0 3.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 5.0 5.1 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 6.0 6.1 6.2 Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics 542: A116, doi:10.1051/0004-6361/201118724, Bibcode: 2012A&A...542A.116A.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 8.0 8.1 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ "HD 125442". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+125442.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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