Mu Horologii
Star in the constellation Horologium
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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 | |
| μ Hor, CPD−60°236, HD 19319, HIP 14240, HR 934, SAO 232981[8] | |
| 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]