Psi7 Aurigae

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For other star systems with this Bayer designation, see Psi Aurigae.
Psi7 Aurigae
Diagram showing star positions and boundaries of the Auriga constellation and its surroundings
Cercle rouge 100%.svg
The location of ψ7 Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 06h 50m 45.94330s[1]
Declination +41° 46′ 52.4267″[1]
Apparent magnitude (V) 5.02[2]
Spectral type K3 III[3]
U−B color index +1.35[2]
B−V color index +1.27[2]
R−I color index 0.46
Radial velocity (Rv) +59.53 ± 0.25[4] km/s
Proper motion (μ) RA: –25.45[1] mas/yr
Dec.: –138.19[1] mas/yr
Parallax (π) 8.61 ± 0.22[1] mas
Distance 379 ± 10 ly
(116 ± 3 pc)
Absolute magnitude (MV) −0.33[5]
Radius 24[6] R
Luminosity 217[5] L
Surface gravity (log g) 2.35[7] cgs
Temperature 4,300[7] K
Metallicity [Fe/H] 0.00[7] dex
Rotational velocity (v sin i) 10[8] km/s
Other designations
ψ7 Aur, 58 Aurigae, BD+41 1536, FK5 2527, HD 49520, HIP 32844, HR 2516, SAO 41380.[9]
Database references
ψ7 Aurigae in optical light

Psi7 Aurigae, Latinized from ψ7 Aurigae, is the Bayer designation for a single[10] star in the northern constellation of Auriga. It is a dim, naked eye star with an apparent visual magnitude of 5.02.[2] Based upon parallax measurements made during the Hipparcos mission,[1] it is approximately 379 light-years (116 parsecs) distant from Earth.

This is an evolved giant star with a stellar classification of K3 III.[3] The measured angular diameter of this star, after correction for limb darkening, is 1.96 ± 0.04 mas.[11] At it estimated distance,[1] this yields a physical size of about 24 times the radius of the Sun.[6] The outer envelope shines with an effective temperature of 4,300,[7] giving it the orange-hued glow of a K-type star.[12]


  1. ^ a b c d e f g 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 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. ^ 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. ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  6. ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1 . The radius (R*) is given by:
  7. ^ a b c d McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527. 
  8. ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B. 
  9. ^ "* 58 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-24. 
  10. ^ 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:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  11. ^ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431: 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039 
  12. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, retrieved 2012-01-16. 

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