HD 27631
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Horologium |
| Right ascension | 04h 19m 45.46920s |
| Declination | −41° 57′ 36.9527″ |
| Apparent magnitude (V) | 8.243±0.012 |
| Characteristics | |
| Spectral type | G3IV |
| B−V color index | 0.721±0.009 |
| Astrometry | |
| Radial velocity (Rv) | 21.04±0.13 km/s |
| Proper motion (μ) | RA: –41.139 mas/yr Dec.: −91.908 mas/yr |
| Parallax (π) | 19.9263±0.0160 mas |
| Distance | 163.7 ± 0.1 ly (50.18 ± 0.04 pc) |
| Absolute magnitude (MV) | 4.97 |
| Details | |
| Mass | 0.944±0.032 M☉ |
| Radius | 0.923±0.033 R☉ |
| Luminosity | 0.97 L☉ |
| Surface gravity (log g) | 4.455±0.038 cgs |
| Temperature | 5,737±36 K |
| Metallicity [Fe/H] | −0.12±0.05 dex |
| Rotation | ~31 d |
| Age | 4.010±2.892 Gyr |
| Other designations | |
| CD−42°1464, HD 27631, HIP 20199, SAO 216753 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 27631 is a star with an orbiting exoplanet in the southern constellation of Horologium. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 8.24. The distance to this system is 164 light years based on parallax measurements. It is drifting further away with a radial velocity of 21 km/s.
This is a G-type star with a stellar classification of G3IV, suggesting it is a subgiant star that is evolving off the main sequence after exhausting the supply of hydrogen at its core. It is smaller than the Sun, with 94% of its mass and 92% of the radius. The star is radiating 97% of the luminosity of the Sun from its photosphere at an effective temperature of 5,737 K. The estimated age is roughly 4.4 billion years and it is spinning slowly with a rotation period of around 31 days.
A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 40 astronomical units.