Global InformationHD 37124 information
| 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] |
| Distance | 103.4 ± 0.2 ly (31.69 ± 0.08 pc) |
| Absolute magnitude (MV) | 5.05[2] |
| Details[4] | |
| Mass | 0.81±0.01 M☉[4] 0.92±0.01[5] M☉ |
| Radius | 0.92±0.02 R☉ 0.91+0.01 −0.04[1] R☉ |
| Luminosity | 0.839±0.003 L☉[4] 0.772+0.003 −0.002[1] L☉ |
| Surface gravity (log g) | 4.41±0.01 cgs |
| Temperature | 5,763±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 |
| Age | 11.8±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 | |
| SIMBAD | data |
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.
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