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Mu Horologii 
Summary
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.
| Observation data Epoch J2000.0 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 mas[1] |
| 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 |
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 edit
- ^ a b c d e f 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, S2CID 18759600.
- ^ a b c 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.
- ^ a b Houk, Nancy; Cowley, A. P. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ a b c 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.
- ^ a b c d e f g 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, arXiv:1207.0499, Bibcode:2012ApJ...756...46R, doi:10.1088/0004-637X/756/1/46, S2CID 119199829.
- ^ a b McDonald, I.; et al. (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.
- ^ "mu. Hor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-04-25.
{{cite web}}: CS1 maint: postscript (link) - ^ 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.