Phi Aurigae

φ Aurigae
Location of φ Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 27m 38.88417s[1]
Declination +34° 28′ 33.1639″[1]
Apparent magnitude (V) 5.089[2]
Characteristics
Spectral type K3 IIIp[3]
U−B color index +1.649[2]
B−V color index +1.411[2]
R−I color index 0.47
Astrometry
Radial velocity (Rv)+30.78[4] km/s
Proper motion (μ) RA: –1.324[1] mas/yr
Dec.: –38.746[1] mas/yr
Parallax (π)6.7629 ± 0.1659 mas[1]
Distance480 ± 10 ly
(148 ± 4 pc)
Absolute magnitude (MV)−0.62[5]
Details
Radius33.97±1.05[6] R☉
Luminosity307±15[6] L☉
Surface gravity (log g)1.75[3] cgs
Temperature4,222[6] K
Metallicity [Fe/H]–0.03[3] dex
Rotational velocity (v sin i)1.6[7] km/s
Other designations
φ Aur, 24 Aurigae, BD+34 1048, HD 35620, HIP 25541, HR 1805, SAO 58051.[8]
Database references
SIMBADdata
φ Aurigae in optical light

Phi Aurigae, Latinized from φ Aurigae, is a giant star in the northern constellation of Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 5.089.[2] It lies 10′ from another faint naked-eye star HD 35520, between the three open clusters M36 and M38, and NGC 1893.

The distance to this star, as determined from parallax measurements, is approximately 480 light-years (150 parsecs) with a 10 light-year margin of error.[9] This is an evolved giant star with a stellar classification of K3 IIIp[3] and an estimated radius equal to 34 times the radius of the Sun. The outer envelope has an effective temperature of 4,222 K,[6] giving it the cool orange-hued glow of a K-type star.

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