Psi4 Aurigae

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Psi4 Aurigae
Auriga constellation map.svg
Red circle.svg
Location of ψ4 Aurigae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Auriga
Right ascension  06h 43m 04.97107s[1]
Declination +44° 31′ 28.0220″[1]
Apparent magnitude (V) +5.02[2]
Spectral type K5 III[3]
U−B color index +1.83[2]
B−V color index +1.48[2]
Radial velocity (Rv)−77.35±0.23[4] km/s
Proper motion (μ) RA: −45.43[1] mas/yr
Dec.: −29.97[1] mas/yr
Parallax (π)10.08 ± 0.33[1] mas
Distance320 ± 10 ly
(99 ± 3 pc)
Absolute magnitude (MV)+0.06[5]
Radius33[4] R
Luminosity245[4] L
Surface gravity (log g)2.04±0.24[6] cgs
Temperature3,970±41[6] K
Metallicity [Fe/H]0.10±0.08[6] dex
Rotational velocity (v sin i)4.8[4] km/s
Other designations
ψ4 Aur, 55 Aurigae, BD+44° 1518, FK5 2517, HD 47914, HIP 32173, HR 2459, SAO 41288[7]
Database references

Psi4 Aurigae, Latinized from ψ4 Aurigae, is a single,[8] orange-hued star in the northern constellation of Auriga, it is visible to the naked eye with an apparent visual magnitude of +5.02.[2] With an annual parallax shift of 10.08 ± 0.33 mas,[1] it is approximately 324 light-years (99 parsecs) distant from Earth.

This is a K-type giant star with a stellar classification of K5 III,[3] it has expanded to 33[4] times the Sun's radius and is radiating 245[4] times the Sun's luminosity from its photosphere at an effective temperature of about 3,970 K.[6] The atmosphere displays a significant enhancement of silicon.[9]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. ^ a b Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598.
  4. ^ a b c d e f Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  5. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  6. ^ a b c d Prugniel, Ph.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: 25, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, A165.
  7. ^ "psi04 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-28.
  8. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  9. ^ Franchini, M.; et al. (January 2004), "Synthetic Lick Indices and Detection of α-Enhanced Stars", The Astrophysical Journal, 601 (1): 485–499, Bibcode:2004ApJ...601..485F, doi:10.1086/380443

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