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38 Aurigae
Observation data; Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	06h 03m 17.94729s
Declination	+42° 54′ 41.5433″
Apparent magnitude (V)	6.08
Characteristics
Evolutionary stage	horizontal branch
Spectral type	K0 III
B−V color index	0.979±0.004
Astrometry
Radial velocity (Rv)	+33.69±0.20 km/s
Proper motion (μ)	RA: +121.023 mas/yr ; Dec.: −144.427 mas/yr
Parallax (π)	13.8158 ± 0.2136 mas
Distance	236 ± 4 ly ; (72 ± 1 pc)
Absolute magnitude (MV)	1.572
Details
Mass	1.59 M☉
Radius	7 R☉
Luminosity	18.47 L☉
Surface gravity (log g)	2.95 cgs
Temperature	4,834 K
Metallicity [Fe/H]	−0.17 dex
Age	3.6±1.0 Gyr
Other designations
	38 Aur, BD+42°1473, FK5 2461, HD 40801, HIP 28677, HR 2199, SAO 40818
Database references
SIMBAD	data

38 Aurigae is a star located 236^[1] light years away from the Sun in the northern constellation of Auriga.^[8] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 6.08.^[2] The star is moving further from the Earth with a heliocentric radial velocity of +34 km/s,^[2] and it has a relatively high proper motion, traversing the celestial sphere at the rate of 0.181 arc seconds per annum.^[9] It is a probable member of the Hercules stream.^[7]

This object is an aging giant star with a stellar classification of K0 III.^[4] At the age of around 3.6^[7] billion years it is a red clump giant, which indicates it is on the horizontal branch and is generating energy via helium fusion at its core.^[3] The star has 1.59^[5] times the mass of the Sun and has expanded to 7^[6] times the Sun's radius. It is radiating 18^[2] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,834 K.^[5]

38 Aurigae has a faint common proper motion companion at an angular separation of 152″, which is equivalent to a projected separation of 12,160 AU. This is a red dwarf star with a class of M5.3.^[10]

References

^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c ^d ^e ^f ^g 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, S2CID 119257644.
^ ^a ^b Mishenina, T. V.; et al. (September 2006), "Elemental abundances in the atmosphere of clump giants", Astronomy and Astrophysics, 456 (3): 1109–1120, arXiv:astro-ph/0605615, Bibcode:2006A&A...456.1109M, doi:10.1051/0004-6361:20065141, S2CID 18764566.
^ ^a ^b Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51: 79, Bibcode:1962RGOB...51...79E.
^ ^a ^b ^c ^d ^e ^f ^g Liu, Yujuan; et al. (August 2010), "Stellar Parameters and Abundance Analysis of 58 Late G Giants", Publications of the Astronomical Society of Japan, 62 (4): 1071–1084, Bibcode:2010PASJ...62.1071L, doi:10.1093/pasj/62.4.1071.
^ ^a ^b Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
^ ^a ^b ^c Ramya, P.; et al. (August 2016), "Chemical compositions and kinematics of the Hercules stream", Monthly Notices of the Royal Astronomical Society, 460 (2): 1356–1370, arXiv:1604.04821, Bibcode:2016MNRAS.460.1356R, doi:10.1093/mnras/stw852.
^ ^a ^b "38 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-22.
^ 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, S2CID 2603568.
^ Dhital, Saurav; et al. (2010), "Sloan Low-mass Wide Pairs of Kinematically Equivalent Stars (SLoWPoKES): A Catalog of Very Wide, Low-mass Pairs", The Astronomical Journal, 139 (6): 2566–2586, arXiv:1004.2755, Bibcode:2010AJ....139.2566D, doi:10.1088/0004-6256/139/6/2566, S2CID 661494.