Star in the constellation Horologium
Alpha Horologii (α Horologii) is a solitary[ 10] giant star and the brightest star in the constellationHorologium . It is visible to the naked eye with anapparent visual magnitude of +3.85.[ 2] parallax shift of 27.721 mas as seen from the Earth, it is located at a distance of 117.6light-years (36.1parsecs ).[ 1] radial velocity of +21.6 km/s.[ 5]
Thestellar classification of K2 III[ 3] evolved giant star of theK class . This means it has consumed the hydrogen at its core and has migrated away from themain sequence , with its outer envelope cooling and expanding in the process. Alpha Horologii has an estimated 1.41 times themass of the Sun [ 2] [ 8] Sun's luminosity from itsphotosphere at aneffective temperature of 4,695 K.[ 2] [ 2] [ 11]
^a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties" .Astronomy and Astrophysics .674 : A1.arXiv :2208.00211 Bibcode :2023A&A...674A...1G .doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source atVizieR .^a b c d e f g Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (2021-02-01)."Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity" .Astronomy and Astrophysics .646 : A77.arXiv :2012.10199 Bibcode :2021A&A...646A..77G .doi :10.1051/0004-6361/202039765 .ISSN 0004-6361 . Alpha Horologii's database entry atVizieR .^a b 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,arXiv :astro-ph/0603770 Bibcode :2006AJ....132..161G ,doi :10.1086/504637 ,S2CID 250741593 . ^ 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 . ^a b 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. ^ Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01)."Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3" .The Astronomical Journal .161 (3): 147.arXiv :2012.05220 Bibcode :2021AJ....161..147B .doi :10.3847/1538-3881/abd806 ISSN 0004-6256 . here .^ 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 ^a b 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.arXiv :1208.2037 Bibcode :2012MNRAS.427..343M .doi :10.1111/j.1365-2966.2012.21873.x S2CID 118665352 . ^ "Alpha Horologii" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved17 March 2016 .^ 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 . ^ Kaler, Jim."Alpha Horologii" .James Kaler's Stars . Retrieved20 September 2019 .
