38 Aurigae

38 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 06h 03m 17.94729s[1]
Declination +42° 54′ 41.5433″[1]
Apparent magnitude (V) 6.08[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type K0 III[4]
B−V color index 0.979±0.004[2]
Astrometry
Radial velocity (Rv)+33.69±0.20[2] km/s
Proper motion (μ) RA: +121.023[1] mas/yr
Dec.: −144.427[1] mas/yr
Parallax (π)13.8158 ± 0.2136 mas[1]
Distance236 ± 4 ly
(72 ± 1 pc)
Absolute magnitude (MV)1.572[5]
Details
Mass1.59[5] M☉
Radius7[6] R☉
Luminosity18.47[2] L☉
Surface gravity (log g)2.95[5] cgs
Temperature4,834[5] K
Metallicity [Fe/H]−0.17[5] dex
Age3.6±1.0[7] Gyr
Other designations
38 Aur, BD+42°1473, FK5 2461, HD 40801, HIP 28677, HR 2199, SAO 40818[8]
Database references
SIMBADdata

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]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Mishenina2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Eggen1962 was invoked but never defined (see the help page).
  5. ^ a b c d e f g Cite error: The named reference Liu2010 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Ramya2016 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference dhital2010 was invoked but never defined (see the help page).