Psi6 Aurigae

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Psi6 Aurigae
Auriga constellation map.svg
Red circle.svg
Location of ψ6 Aurigae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Auriga
Right ascension  06h 47m 39.57703s[1]
Declination +48° 47′ 22.1222″[1]
Apparent magnitude (V) +5.22[2]
Spectral type K0.5 III[1]
U−B color index +1.04[2]
B−V color index +1.11[2]
Radial velocity (Rv)−6.51±0.30[3] km/s
Proper motion (μ) RA: −4.32[1] mas/yr
Dec.: +7.19[1] mas/yr
Parallax (π)9.05 ± 0.38[1] mas
Distance360 ± 20 ly
(110 ± 5 pc)
Absolute magnitude (MV)+0.01[4]
Period (P)5,996±26 d
Eccentricity (e)0.044±0.014
Periastron epoch (T)52556 ± 310 MJD
Argument of periastron (ω)
Semi-amplitude (K1)
3.24±0.04 km/s
ψ6 Aur A
Mass2.02±0.28 M
Radius17.72±0.76 R
Luminosity123.4±10.2 L
Surface gravity (log g)2.25±0.07 cgs
Temperature4,574±26 K
Metallicity [Fe/H]−0.08±0.10 dex
Rotational velocity (v sin i)+10[7] km/s
Age1.55±0.67 Gyr
Other designations
ψ6 Aur, 57 Aurigae, BD+48° 1436, FK5 1176, HD 48781, HIP 32562, HR 2487, SAO 41346[8]
Database references

Psi6 Aurigae, Latinized from ψ6 Aurigae, is a spectroscopic binary[5] star in the northern constellation of Auriga, it is a dim, naked eye star with an apparent visual magnitude of +5.22.[2] Based upon a measured annual parallax shift of 9.05 ± 0.38 mas,[1] it is approximately 360 light-years (110 parsecs) distant from the Earth.

This is a single-lined spectroscopic binary star system with an orbital period of 5,996 days (16.4 years) and an eccentricity of 0.044.[5] The visible component is a K-type giant star with a stellar classification of K0.5 III.[1] It is most likely (78% chance) on the red giant branch and is around 1.55 billion years old. As such, it has an estimated double the mass of the Sun and about 18 times the Sun's radius; the star is radiating about 123 times the Sun's luminosity from its photosphere at an effective temperature of 4,574 K.[6]


  1. ^ a b c d e f g h 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 Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133: 475–493, Bibcode:1966MNRAS.133..475A, doi:10.1093/mnras/133.4.475.
  3. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  4. ^ 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.
  5. ^ a b c Griffin, R. F. (February 2010), "Spectroscopic binary orbits from photoelectric radial velocities - Paper 210: Psi2 Aurigae and 34 Pegasi", The Observatory, 130 (1): 17–32, Bibcode:2010Obs...130...17G.
  6. ^ a b Reffert, Sabine; et al. (2015), "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity", Astronomy & Astrophysics, 574: A116, arXiv:1412.4634, Bibcode:2015A&A...574A.116R, doi:10.1051/0004-6361/201322360, hdl:10722/215277. The values presented are for the RGB branch model.
  7. ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239, Bibcode:1970CoAsi.239....1B.
  8. ^ "psi06 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-28.

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