Astronomy:19 Aurigae

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19 Aurigae
Observation data
Equinox J2000.0]] (ICRS)
Constellation Auriga
Right ascension  05h 20m 00.92092s[1]
Declination +33° 57′ 29.0049″[1]
Apparent magnitude (V) 5.05[2]
Evolutionary stage bright giant
Spectral type A5 II+[3]
B−V color index 0.287±0.004[2]
Radial velocity (Rv)−4.3±0.9[2] km/s
Proper motion (μ) RA: −0.119[1] mas/yr
Dec.: −4.057[1] mas/yr
Parallax (π)0.9119 ± 0.1885[1] mas
Distanceapprox. 3,600 ly
(approx. 1,100 pc)
Mass7.8±0.5[4] M
Radius15[5] R
Luminosity (bolometric)7,057[6] L
Surface gravity (log g)2.10±0.25[7] cgs
Temperature8,300±100[7] K
Metallicity [Fe/H]−0.19[2] dex
Rotational velocity (v sin i)8.0[8] km/s
Age36.0±2.9[4] Myr
Other designations
19 Aur, NSV 1925, BD+33°1013, GC 6515, HD 34578, HIP 24879, HR 1740, SAO 57906[9]
Database references

19 Aurigae is a single[10] star located approximately 3,600 light years away from the Sun in the northern constellation Auriga. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.05.[2] The star is moving closer to the Earth with a heliocentric radial velocity of 4.3 km/s.[2]

This is an evolved A-type bright giant star with a stellar classification of A5 II+.[3] It is a variable star of unknown type that ranges in magnitude from 5.03 down to 5.09.[11] This star is an estimated 36[4] million years old with a projected rotational velocity of 8 km/s.[8] It has 8[4] times the mass of the Sun and about 15[5] times the Sun's radius. 19 Aurigae is radiating 7,057[6] times the total luminosity of the Sun from its photosphere at an effective temperature of 8,300 K.[7]


  1. 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  3. 3.0 3.1 Gray, R. O. et al. (2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal 121 (4): 2148, doi:10.1086/319956, Bibcode2001AJ....121.2148G. 
  4. 4.0 4.1 4.2 4.3 Tetzlaff, N. et al. (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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode2011MNRAS.410..190T. 
  5. 5.0 5.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode2001A&A...367..521P. 
  6. 6.0 6.1 Hohle, M. M. et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, doi:10.1002/asna.200911355, Bibcode2010AN....331..349H. 
  7. 7.0 7.1 7.2 Lyubimkov, Leonid S. et al. (February 2010), "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society 402 (2): 1369–1379, doi:10.1111/j.1365-2966.2009.15979.x, Bibcode2010MNRAS.402.1369L. 
  8. 8.0 8.1 Lyubimkov, Leonid S. et al. (2015), "Carbon abundance and the N/C ratio in atmospheres of A-, F- and G-type supergiants and bright giants", Monthly Notices of the Royal Astronomical Society 446 (4): 3447, doi:10.1093/mnras/stu2299, Bibcode2015MNRAS.446.3447L 
  9. "19 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. 
  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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode2008MNRAS.389..869E. 
  11. Chistyakov, Yu. N.; Sokolov, N. A. (November 1999), "On the Variability of 19 Aurigae as Observed by the Hipparcos Satellite", Information Bulletin on Variable Stars 4808: 1, Bibcode1999IBVS.4808....1C. 

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