HD 125442

HD 125442
Location of HD 125442 (circled in red)
Observation data
Epoch J2000      Equinox ICRS
Constellation Lupus
Right ascension 14h 20m 42.58071s
Declination −45° 11′ 13.4190″
Apparent magnitude (V) 4.78
Characteristics
Spectral type F0 IV
B−V color index 0.310±0.003
Astrometry
Radial velocity (Rv)+0.0±3.7 km/s
Proper motion (μ) RA: +37.33 mas/yr
Dec.: −72.81 mas/yr
Parallax (π)22.1448±0.3265 mas
Distance147 ± 2 ly
(45.2 ± 0.7 pc)
Absolute magnitude (MV)1.49
Details
Mass1.58 M☉
Radius2.95 R☉
Luminosity20.2 L☉
Surface gravity (log g)3.97 cgs
Temperature7,123 K
Rotational velocity (v sin i)148±10 km/s
Age614 Myr
Other designations
CD−44°9236, HD 125442, HIP 70104, HR 5364, SAO 224843
Database references
SIMBADdata

HD 125442 is a single star in the southern constellation of Lupus. Its apparent visual magnitude is 4.78, which can be seen with the naked eye. The distance to HD 125442, as determined from its annual parallax shift of 22.1 mas, is 147 light years.

This is an F-type subgiant star with a stellar classification of F0 IV, having, at the age of 614 million years, 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. The star displays a high rate of spin with a projected rotational velocity of 148 km/s.

References

  1. 1 2 3 4 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 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.
  3. 1 2 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.
  4. ↑ 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  5. 1 2 van Leeuwen, F. (November 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.
  6. 1 2 3 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, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
  7. 1 2 3 4 5 6 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
  8. 1 2 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  9. ↑ "HD 125442". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-22.
  10. ↑ 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.