HD 37124

HD 37124
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 05h 37m 02.4867s[1]
Declination +20° 43′ 50.8346″[1]
Apparent magnitude (V) 7.68[2]
Characteristics
Spectral type G4IV-V[3]
B−V color index 0.667±0.008[2]
Astrometry
Radial velocity (Rv)−23.02±0.09[2] km/s
Proper motion (μ) RA: −79.607±0.184[1] mas/yr
Dec.: −420.161±0.166[1] mas/yr
Parallax (π)31.5536 ± 0.0751 mas[1]
Distance103.4 ± 0.2 ly
(31.69 ± 0.08 pc)
Absolute magnitude (MV)5.05[2]
Details[4]
Mass0.81±0.01 M☉[4]
0.92±0.01[5] M☉
Radius0.92±0.02 R☉
0.91+0.01
−0.04[1] R☉
Luminosity0.839±0.003 L☉[4]
0.772+0.003
−0.002[1] L☉
Surface gravity (log g)4.41±0.01 cgs
Temperature5,763±22 K
Metallicity [Fe/H]−0.38±0.01 dex[2]
−0.45[6] dex
Rotational velocity (v sin i)3.6[5] km/s
Age11.8±1.2 Gyr[4]
10.62±1.74[5] Gyr
Other designations
BD+20°1018, GJ 209, HD 37124, HIP 26381, SAO 77323, G 100-27[3]
Database references
SIMBADdata

HD 37124 is a star in the equatorial constellation of Taurus (the Bull), positioned about a half degree to the SSW of the bright star Zeta Tauri.[7] The apparent visual magnitude of this star is 7.68,[2] which is too dim to be visible to the naked eye. It is located at a distance of 103 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −23 km/s.[2] Three extrasolar planets have been found to orbit the star.

The stellar classification of HD 37124 is G4IV-V, showing a spectrum with blended traits of a main sequence star and a more evolved subgiant star. It is a quiet star with a low activity index.[8] This star is smaller than the Sun, with 81–92% of the mass of the Sun and around 92% of the Sun's radius. It is an older, thick disk[9] star with an age of around 11 billion years, and is spinning with a projected rotational velocity of 3.6 km/s.[5] The metallicity of the star, what astronomers term the abundance of heavier elements, is much lower than in the Sun with an iron abundance of 35–41%. It is radiating 77–84% of the Sun's luminosity from its photosphere at an effective temperature of 5,763 K.

  1. ^ a b c d e f g Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Bonfanti2015 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Earle2017 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Huang2005 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Sinnott_Perryman_1997 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Goździewski_et_al_2006 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Gonzalez2009 was invoked but never defined (see the help page).