HD 81101

This article is about k Carinae. For K Carinae, see HR 4138.
HD 81101
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]
Distance225 ± 2 ly
(69.0 ± 0.8 pc)
Absolute magnitude (MV)0.51[2]
Details
Mass1.95[4] M☉
Radius11.19+0.19
−0.15[1] R☉
Luminosity65.4±0.9[1] L☉
Surface gravity (log g)2.720±0.050[5] cgs
Temperature4,908+43
−33[1] K
Metallicity [Fe/H]−0.360±0.020[5] dex
Age2.04[4] Gyr
Other designations
k Car, CPD−61°1242, FK5 2745, GC 12923, HD 81101, HIP 45856, HR 3728, SAO 250544[6]
Database references
SIMBADdata

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]

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]

  1. ^ a b c d e f g h i j k l m n Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Alves2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference BailerJones2015 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggen1989 was invoked but never defined (see the help page).