Mu Phoenicis
Star in the constellation Phoenix
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μ Phoenicis, Latinized as Mu Phoenicis, is a suspected astrometric binary[10] star system in the southern constellation of Phoenix. It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.59.[2] This system is located approximately 246 light years distant from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +17.4 km/s.[4]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Phoenix |
| Right ascension | 00h 41m 19.55229s[1] |
| Declination | −46° 05′ 06.0184″[1] |
| Apparent magnitude (V) | 4.59[2] |
| Characteristics | |
| Spectral type | G8III[3] |
| U−B color index | +0.72[2] |
| B−V color index | +0.97[2] |
| Astrometry | |
| Radial velocity (Rv) | +17.41±0.16[4] km/s |
| Proper motion (μ) | RA: −28.20[1] mas/yr Dec.: +1.80[1] mas/yr |
| Parallax (π) | 13.27±0.23 mas[1] |
| Distance | 246 ± 4 ly (75 ± 1 pc) |
| Absolute magnitude (MV) | 0.21[5] |
| Details | |
| Mass | 2.50[6] M☉ |
| Radius | 13.15+2.59 −2.28[4] R☉ |
| Luminosity | 96.6±2.4[4] L☉ |
| Temperature | 4,900[7] K |
| Rotational velocity (v sin i) | 1.4[8] km/s |
| Age | 1.4[6] Gyr |
| Other designations | |
| μ Phe, CD−46°180, FK5 1015, GC 823, HD 3919, HIP 3245, HR 180, SAO 215194[9] | |
| Database references | |
| SIMBAD | data |
The visible component is an aging G-type giant star with a stellar classification of G8III.[3] Having exhausted the supply of hydrogen at its core, this star cooled and expanded off the main sequence. At present it has 13[4] times the girth of the Sun. It is 1.4[6] billion years old with 2.5[6] times the mass of the Sun. It is radiating 97[4] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,900 K.[7]