Mu Phoenicis

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]

Mu Phoenicis

Location of μ Phoenicis (circled)
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]