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 clustersM36 and M38, and NGC 1893.
The distance to this star, as determined from parallax measurements, is approximately 480 light-years (150 parsecs) with a 10light-year margin of error.[9] This is an evolved giant star with a stellar classification of K3IIIp[3] and an estimated radius equal to 16 times the radius of the Sun. The outer envelope has an effective temperature of 4,367K,[3] giving it the cool orange-hued glow of a K-type star.
Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants.", Monthly Notices of the Royal Astronomical Society, 172 (3): 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
Famaey, B.; etal. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID17804304.
Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. S2CID148571616.
De Medeiros, J. R.; etal. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
"* phi Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-23.
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