HD 81101 is a single[7] star in the southern constellation of Carina. It has the Bayer designation k Carinae, while HD 81101 is the star's designation in the Henry Draper catalogue. The star has a yellow hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.79.[2] It is located at a distance of approximately 225 light years from the Sun based on parallax.[1] This object is drifting further away with a radial velocity of +51 km/s,[1] having come to within 22 light-years of the Sun some 1.4 million years ago.[8]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Carina |
Right ascension | 09h 20m 56.81329s[1] |
Declination | −62° 24′ 16.6811″[1] |
Apparent magnitude (V) | 4.79[2] |
Characteristics | |
Spectral type | G6III[3] |
B−V color index | +0.926±0.035[2] |
Astrometry | |
Radial velocity (Rv) | +51.12±0.15[1] km/s |
Proper motion (μ) | RA: −27.15[1] mas/yr Dec.: −14.18[1] mas/yr |
Parallax (π) | 14.4946 ± 0.1593 mas[1] |
Distance | 225 ± 2 ly (69.0 ± 0.8 pc) |
Absolute magnitude (MV) | 0.51[2] |
Details | |
Mass | 1.95[4] M☉ |
Radius | 11.19+0.19 −0.15[1] R☉ |
Luminosity | 65.4±0.9[1] L☉ |
Surface gravity (log g) | 2.720±0.050[5] cgs |
Temperature | 4,908+43 −33[1] K |
Metallicity [Fe/H] | −0.360±0.020[5] dex |
Age | 2.04[4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
This is an aging giant star with a stellar classification of G6III,[3] having exhausted the supply of hydrogen at its core then cooled and expanded away from the main sequence. It is two[4] billion years old with 1.95[4] times the mass of the Sun and has expanded to 11[1] times the Sun's radius. The star is radiating 65[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,908 K.[1] Being a member of the old disk population,[9] the metallicity of the star's stellar atmosphere is much lower than solar.[5]