Alpha Horologii

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Alpha Horologii
Observation data
Epoch J2000      Equinox J2000
Constellation Horologium
Right ascension 04h 14m 00.11445s[1]
Declination −42° 17′ 39.7232″ [1]
Apparent magnitude (V) +3.853[2]
Spectral type K2 III[3]
U−B color index +1.013[2]
B−V color index +1.097[2]
Radial velocity (Rv) +21.6±0.3[4] km/s
Proper motion (μ) RA: +42.0±0.11[1] mas/yr
Dec.: −203.55±0.12[1] mas/yr
Parallax (π) 28.36 ± 0.12[1] mas
Distance 115.0 ± 0.5 ly
(35.3 ± 0.1 pc)
Absolute bolometric
Mass 1.55[5] M
Luminosity 37.61[6] L
Temperature 5,028[6] K
Metallicity [Fe/H] -0.02[5] dex
Other designations
α Hor, CD−42° 1425, HD 26967, HIP 19747, HR 1326, SAO 216710.[7]
Database references

Alpha Horologii (α Hor, α Horologii) is a solitary[8] orange-hued giant star in the constellation Horologium. Located 115.0 ± 0.5 light-years distant from Earth,[1] it shines with a luminosity approximately 37.61 times that of the Sun and has a surface temperature of 5,028 K.[6]


  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Cousins, A. W. J. (1973), "Revised zero points and UBV photometry of stars in the Harvard E and F regions", Memoirs of the Royal Astronomical Society, 77: 223–236, Bibcode:1973MmRAS..77..223C. 
  3. ^ Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I", The Astronomical Journal, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770Freely accessible, doi:10.1086/504637. 
  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, Bibcode:2012A&A...546A..61D, arXiv:1208.3048Freely accessible, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ a b c Liu, Y. J.; Zhao, G.; Shi, J. R.; Pietrzyński, G.; Gieren, W. (2007). "The abundances of nearby red clump giants". Monthly Notices of the Royal Astronomical Society. 382 (2): 553–66. Bibcode:2007MNRAS.382..553L. doi:10.1111/j.1365-2966.2007.11852.x. 
  6. ^ a b c McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. Bibcode:2012MNRAS.427..343M. arXiv:1208.2037Freely accessible. doi:10.1111/j.1365-2966.2012.21873.x. 
  7. ^ "Alpha Horologii". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 March 2016. 
  8. ^ 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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x.