HD 27631
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Horologium |
| Right ascension | 04h 19m 45.46920s[1] |
| Declination | −41° 57′ 36.9527″[1] |
| Apparent magnitude (V) | 8.243±0.012[2] |
| Characteristics | |
| Spectral type | G3IV[2] |
| B−V color index | 0.721±0.009[2] |
| Astrometry | |
| Radial velocity (Rv) | 21.04±0.13[1] km/s |
| Proper motion (μ) | RA: –41.139 mas/yr[1] Dec.: −91.908 mas/yr[1] |
| Parallax (π) | 19.9263±0.0160 mas[1] |
| Distance | 163.7 ± 0.1 ly (50.18 ± 0.04 pc) |
| Absolute magnitude (MV) | 4.97[3] |
| Details[2] | |
| Mass | 0.944±0.032 M☉ |
| Radius | 0.923±0.033 R☉ |
| Luminosity | 0.97[3] 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[4] | |
| 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.[2] 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.[1]
This is a G-type star with a stellar classification of G3IV,[2] 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.[2] The star is radiating 97%[3] of the luminosity of the Sun from its photosphere at an effective temperature of 5,737 K.[2] The estimated age is roughly 4.4 billion years[5] and it is spinning slowly with a rotation period of around 31 days.[2]
A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 40 astronomical units.[6]
