Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Columba |
Right ascension | 06h 01m 16.298s[1] |
Declination | −33° 54′ 42.61″[1] |
Apparent magnitude (V) | 5.52±0.01[2] |
Characteristics | |
Spectral type | K5 III[3] |
U−B color index | +1.94[4] |
B−V color index | +1.58[4] |
Astrometry | |
Radial velocity (Rv) | 19.0±7.4[5] km/s |
Proper motion (μ) | RA: 4.876[1] mas/yr Dec.: −26.178[1] mas/yr |
Parallax (π) | 4.8320 ± 0.0725 mas[1] |
Distance | 670 ± 10 ly (207 ± 3 pc) |
Absolute magnitude (MV) | −0.82[6] |
Details | |
Mass | 1.81[7] M☉ |
Radius | 49.24[8] R☉ |
Luminosity | 501[7] L☉ |
Surface gravity (log g) | 1.7[9] cgs |
Temperature | 3,700±150[10] K |
Metallicity [Fe/H] | 0.00[10] dex |
Rotational velocity (v sin i) | 2.6±1.1[11] km/s |
Age | 2.19[7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HR 2131 (HD 41047) is a solitary[12] star in the southern constellation Columba. It has an apparent magnitude of 5.52,[2] allowing it to be faintly seen with the naked eye. The object is located at a distance of 670 light years[1] but is receding with a heliocentric radial velocity of 19 km/s.[5]
HR 2131 has a stellar classification of K5 III,[3] indicating that it is a red giant. It has 1.81 times the mass of the Sun and is 2.19 billion years old.[7] The star's high luminosity of 501 L☉[7] and a low effective temperature of 3,700 K[10] causes it to have an enlarged radius 49 times that of the Sun.[8] HR 2131's metallicity – elements heavier than helium – is around solar level;[10] it spins with a projected rotational velocity of about 2.6 km/s.[11]