HR 2131
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 06h 01m 16.298s |
| Declination | −33° 54′ 42.61″ |
| Apparent magnitude (V) | 5.52±0.01 |
| Characteristics | |
| Spectral type | K5 III |
| U−B color index | +1.94 |
| B−V color index | +1.58 |
| Astrometry | |
| Radial velocity (Rv) | 19.0±7.4 km/s |
| Proper motion (μ) | RA: 4.876 mas/yr Dec.: −26.178 mas/yr |
| Parallax (π) | 4.8320±0.0725 mas |
| Distance | 670 ± 10 ly (207 ± 3 pc) |
| Absolute magnitude (MV) | −0.82 |
| Details | |
| Mass | 1.81 M☉ |
| Radius | 49.24 R☉ |
| Luminosity | 501 L☉ |
| Surface gravity (log g) | 1.7 cgs |
| Temperature | 3,700±150 K |
| Metallicity [Fe/H] | 0.00 dex |
| Rotational velocity (v sin i) | 2.6±1.1 km/s |
| Age | 2.19 Gyr |
| Other designations | |
| 67 G. Columbae, CD−33°2681, CPD−33°980, GC 7630, HD 41047, HIP 28524, HR 2131, SAO 196413 | |
| Database references | |
| SIMBAD | data |
HR 2131 (HD 41047) is a solitary star in the southern constellation Columba. It has an apparent magnitude of 5.52, allowing it to be faintly seen with the naked eye. The object is located at a distance of 670 light years but is receding with a heliocentric radial velocity of 19 km/s.
HR 2131 has a stellar classification of K5 III, indicating that it is a red giant. It has 1.81 times the mass of the Sun and is 2.19 billion years old. The star's high luminosity of 501 L☉ and a low effective temperature of 3,700 K causes it to have an enlarged radius 49 times that of the Sun. HR 2131's metallicity – elements heavier than helium – is around solar level; it spins with a projected rotational velocity of about 2.6 km/s.