Psi1 Aurigae

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Psi1 Aurigae
Auriga constellation map.svg
Red circle.svg
Location of ψ1 Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 06h 24m 53.90129s[1]
Declination +49° 17′ 16.4199″[1]
Apparent magnitude (V) 4.91[2]
Spectral type M0 I[3]
U−B color index +2.29[2]
B−V color index +1.97[2]
R−I color index 1.07
Variable type LC[4]
Radial velocity (Rv)+4.7[5] km/s
Proper motion (μ) RA: –0.66[1] mas/yr
Dec.: –1.82[1] mas/yr
Parallax (π)0.82 ± 0.28[1] mas
Distanceapprox. 4,000 ly
(approx. 1,200 pc)
Absolute magnitude (MV)−5.53[6]
Mass14.4 ± 0.8[7] M
Radius600[8] R
Diameter600[8] D
Luminosity63,579[9] L
Temperature3,750[3] K
Metallicity [Fe/H]+0.08[10] dex
Age12.3 ± 0.4[7] Myr
Other designations
46 Aurigae, BD+49 1488, FK5 242, HD 44537, HIP 30520, HR 2289, SAO 41076.[11]
Database references

Psi1 Aurigae1 Aur, ψ1 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 4.91.[2] Based upon a measured annual parallax shift of 0.82 mas,[1] it is approximately 4,000 light-years (1,200 parsecs) distant from the Earth.

This is a massive supergiant star with a stellar classification of M0 I.[3] It is a slow irregular variable of the LC type, with its brightness varying in magnitude by 0.44.[4] The star is more than 14[7] times as massive as the Sun and is blazing with 63,579[9] times the Sun's luminosity. This energy is being radiated into outer space from its outer atmosphere at an effective temperature of 3,750 K,[3] giving it the orange-red hue of a cool M-type star.


  1. 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752v1, Bibcode 2007A&A...474..653V, doi:10.1051/0004-6361:20078357. Note: see VizieR catalogue I/311.
  2. 2.0 2.1 2.2 2.3 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode 1978A&AS...34....1N.
  3. 3.0 3.1 3.2 3.3 Levesque, Emily M. et al. (August 2005), "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought", The Astrophysical Journal 628 (2): 973–985, arXiv:astro-ph/0504337, Bibcode 2005ApJ...628..973L, doi:10.1086/430901.
  4. 4.0 4.1 Adelman, Saul J. (2001), "Stars with the Largest Hipparcos Photometric Amplitudes", Baltic Astronomy 10: 589–593, Bibcode 2001BaltA..10..589A.
  5. Wielen, R. et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Astronomisches Rechen-Institut Heidelberg, Bibcode 1999VeARI..35....1W.
  6. Schiavon, Ricardo P. (July 2007), "Population Synthesis in the Blue. IV. Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations", The Astrophysical Journal Supplement Series 171 (1): 146–205, arXiv:astro-ph/0611464, Bibcode 2007ApJS..171..146S, doi:10.1086/511753.
  7. 7.0 7.1 7.2 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, arXiv:1007.4883, Bibcode 2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  8. {{{1}}}
  9. 9.0 9.1 Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, arXiv:1003.2335, Bibcode 2010AN....331..349H, doi:10.1002/asna.200911355.
  10. Bakos, Gustav A. (October 1971), "Abundances of Heavy Elements in Late-Type Stars", Journal of the Royal Astronomical Society of Canada 65: 222, Bibcode 1971JRASC..65..222B.
  11. Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).


External links