Lambda Horologii

λ Horologii
Observation data
Epoch J2000      Equinox J2000
Constellation Horologium
Right ascension 02h 24m 53.91014s[1]
Declination −60° 18′ 43.0132″ [1]
Apparent magnitude (V) +5.35[2]
Characteristics
Spectral type F2III[3]
B−V color index +0.39[2]
Astrometry
Radial velocity (Rv)+6.0±7.4[4] km/s
Proper motion (μ) RA: −71.69±0.18[1] mas/yr
Dec.: −131.28±0.21[1] mas/yr
Parallax (π)20.25 ± 0.18[1] mas
Distance161 ± 1 ly
(49.4 ± 0.4 pc)
Absolute magnitude (MV)+1.91[5]
Details
Mass1.76[6] M☉
Surface gravity (log g)3.66[7] cgs
Temperature6,848[6] K
Metallicity [Fe/H]−0.12[6] dex
Rotational velocity (v sin i)+140[3] km/s
Age1.4[6] Gyr
Other designations
λ Hor, CPD−60° 199, FK5 84, HD 15233, HIP 11258, HR 714, SAO 248555[8]
Database references
SIMBADdata

λ Horologii, Latinised as Lambda Horologii, is a yellow-white giant star in the constellation Horologium. Analysis of its temperature and metallicity gives it a mass 1.76 times that of the Sun, a surface temperature of 6848 K, and an age of 1.4 billion years.[6] Its rotational velocity is 140 km/second and has an oblateness of 0.17.[3]

References

  1. 1 2 3 4 5 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.
  2. 1 2 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. 1 2 3 Belle, G. T. (2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20: 51. arXiv:1204.2572. Bibcode:2012A&ARv..20...51V. doi:10.1007/s00159-012-0051-2.
  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, A61.
  5. ↑ Ammler-von Eiff, M.; Reiners, A. (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.
  6. 1 2 3 4 5 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy & Astrophysics. 530 (A138): 21. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276.
  7. ↑ 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.
  8. ↑ "Lambda Horologii". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 March 2016.


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