Astronomy:Mu Horologii
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Short description: Star in the constellation Horologium
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Horologium |
| Right ascension | 03h 03m 36.81891s[1] |
| Declination | −59° 44′ 15.9925″[1] |
| Apparent magnitude (V) | 5.11[2] |
| Characteristics | |
| Spectral type | F0 III/IV[3] |
| B−V color index | +0.34[2] |
| Astrometry | |
| Radial velocity (Rv) | 17.3±2.8[4] km/s |
| Proper motion (μ) | RA: −73.29[1] mas/yr Dec.: −64.06[1] mas/yr |
| Parallax (π) | 23.04 ± 0.16[1] mas |
| Distance | 141.6 ± 1.0 ly (43.4 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.99[5] |
| Details | |
| Mass | 1.53+0.08 −0.01[6] M☉ |
| Luminosity | 13[7] L☉ |
| Surface gravity (log g) | 3.80±0.02[6] cgs |
| Temperature | 6,898±63[6] K |
| Metallicity [Fe/H] | −0.42±0.05[6] dex |
| Rotational velocity (v sin i) | 79.2±4.0[5] km/s |
| Age | 1.95+0.20 −0.14[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Mu Horologii (μ Horologii) is a solitary,[9] yellow-white hued star in the southern constellation of Horologium. It is faintly visible to the naked eye with an apparent visual magnitude of 5.11.[2] Based upon an annual parallax shift of 23.04 mas as seen from Earth,[1] it is located about 141.6 light years from the Sun.
This is an evolving F-type star with a stellar classification of F0 III/IV,[3] showing mixed traits of a subgiant and a giant star. It is around two billion years old with a projected rotational velocity of 79.2 km/s.[5] The star has 1.5[6] times the mass of the Sun and is radiating 13[7] times the solar luminosity from its photosphere at an effective temperature of 6,898 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (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.
- ↑ 2.0 2.1 2.2 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.
- ↑ 3.0 3.1 Houk, Nancy; Cowley, A. P. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1975mcts.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 5.2 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.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Ramírez, I. et al. (September 2012), "Lithium Abundances in nearby FGK Dwarf and Subgiant Stars: Internal Destruction, Galactic Chemical Evolution, and Exoplanets", The Astrophysical Journal 756 (1): 46, doi:10.1088/0004-637X/756/1/46, Bibcode: 2012ApJ...756...46R.
- ↑ 7.0 7.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ "mu. Hor". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=mu.+Hor.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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