Phi Aurigae

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Phi Aurigae
Diagram showing star positions and boundaries of the Auriga constellation and its surroundings
Cercle rouge 100%.svg

The location of φ Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 27m 38.88605s[1]
Declination +34° 28′ 33.2123″[1]
Apparent magnitude (V) 5.089[2]
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
Radial velocity (Rv) +30.78[4] km/s
Proper motion (μ) RA: –1.89[1] mas/yr
Dec.: –38.74[1] mas/yr
Parallax (π) 7.20 ± 0.60[1] mas
Distance 450 ± 40 ly
(140 ± 10 pc)
Radius 16[5] R
Surface gravity (log g) 1.75[3] cgs
Temperature 4,367[3] K
Metallicity [Fe/H] –0.03[3] dex
Rotational velocity (v sin i) 1.6[6] km/s
Other designations
24 Aurigae, BD+34 1048, HD 35620, HIP 25541, HR 1805, SAO 58051.[7]
Database references

Phi Aurigae (φ Aur, φ Aurigae) is the Bayer designation for a star in the northern constellation of Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 5.089.[2] The distance to this star, as determined from parallax measurements, is approximately 450 light-years (140 parsecs) with a 40 light-year margin of error.[1] 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.


  1. ^ a b c d e f van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.  Note: see VizieR catalogue I/311.
  2. ^ a b c d 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: 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667. 
  3. ^ a b c d e f Cenarro, A. J.; et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society, 374 (2): 664–690, arXiv:astro-ph/0611618Freely accessible, Bibcode:2007MNRAS.374..664C, doi:10.1111/j.1365-2966.2006.11196.x. 
  4. ^ Famaey, B.; et al. (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/0409579Freely accessible, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272. 
  5. ^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289Freely accessible, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  6. ^ De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273Freely accessible, Bibcode:2000A&A...363..239D. 
  7. ^ "phi Aur -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-08-23. 

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