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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h27m 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] |
| Distance | 480 ± 10 ly (148 ± 4 pc) |
| Absolute magnitude (MV) | −0.62[5] |
| Details | |
| Radius | 32[6] R☉ |
| Luminosity | 242 - 247[6] L☉ |
| Surface gravity (log g) | 1.75[3] cgs |
| Temperature | 3,986[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 | |
| SIMBAD | data |
Phi Aurigae, Latinized from φ Aurigae, is a giant star in the northern constellationofAuriga. 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 16 times the radius of the Sun. The outer envelope has an effective temperature of 4,367 K,[3] giving it the cool orange-hued glow of a K-type star.
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