39 Aurigae

39 Aurigae is a single[7] star in the constellation of Auriga. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712. The star is just barely visible to the naked eye, having an apparent visual magnitude of 5.90.[2] Based upon an annual parallax shift of 20.11[1] mas as seen from Earth, it is located 112 light years away. 5 Andromedae is moving further from the Sun with a radial velocity of +34 km/s.[3] It has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.151 arc seconds per year.[8]

39 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  06h 05m 03.38423s[1]
Declination +42° 58′ 53.8846″[1]
Apparent magnitude (V) 5.90[2]
Characteristics
Spectral type F1 V[2]
B−V color index 0.358±0.005[2]
Astrometry
Radial velocity (Rv)+34.1±2.9[3] km/s
Proper motion (μ) RA: −45.17[1] mas/yr
Dec.: −144.26[1] mas/yr
Parallax (π)20.11 ± 0.40[1] mas
Distance162 ± 3 ly
(49.7 ± 1.0 pc)
Absolute magnitude (MV)2.45[4]
Details
Mass1.45[5] M☉
Luminosity9.36[2] L☉
Surface gravity (log g)4.14±0.14[5] cgs
Temperature7,161±243[5] K
Metallicity [Fe/H]−0.03±0.15[2] dex
Rotational velocity (v sin i)87.8±4.4[4] km/s
Age603[5] Myr
Other designations
39 Aur, BD+42° 1477, HD 41074, HIP 28823, HR 2132, SAO 40840[6]
Database references
SIMBADdata

This is an F-type main-sequence star with a stellar classification of F1 V.[2] It is an estimated 603[5] million years old with a relatively high rate of spin, showing a projected rotational velocity of around 88 km/s.[4] The star has 1.45[5] times the mass of the Sun and it is radiating 9.36[2] times the Sun's luminosity from its photosphere at an effective temperature of around 7,161 K.[5]

References
  1. 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. 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.
  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. Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724.
  5. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  6. "39 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-07.
  7. 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.
  8. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854.
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