HD 37124
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. The apparent visual magnitude of this star is 7.68, 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. Three extrasolar planets have been found to orbit the star.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 05h 37m 02.4867s |
| Declination | +20° 43′ 50.8346″ |
| Apparent magnitude (V) | 7.68 |
| Characteristics | |
| Spectral type | G4IV-V |
| B−V color index | 0.667±0.008 |
| Astrometry | |
| Radial velocity (Rv) | −23.02±0.09 km/s |
| Proper motion (μ) | RA: −79.607±0.184 mas/yr Dec.: −420.161±0.166 mas/yr |
| Parallax (π) | 31.5536 ± 0.0751 mas |
| Distance | 103.4 ± 0.2 ly (31.69 ± 0.08 pc) |
| Absolute magnitude (MV) | 5.05 |
| Details | |
| Mass | 0.81±0.01 M☉ 0.92±0.01 M☉ |
| Radius | 0.92±0.02 R☉ 0.91+0.01 −0.04 R☉ |
| Luminosity | 0.839±0.003 L☉ 0.772+0.003 −0.002 L☉ |
| Surface gravity (log g) | 4.41±0.01 cgs |
| Temperature | 5,763±22 K |
| Metallicity [Fe/H] | −0.38±0.01 dex −0.45 dex |
| Rotational velocity (v sin i) | 3.6 km/s |
| Age | 11.8±1.2 Gyr 10.62±1.74 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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. 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 star with an age of around 11 billion years, and is spinning with a projected rotational velocity of 3.6 km/s. 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.