HR 2131

HR 2131
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]
Distance670 ± 10 ly
(207 ± 3 pc)
Absolute magnitude (MV)−0.82[6]
Details
Mass1.81[7] M☉
Radius49.24[8] R☉
Luminosity501[7] L☉
Surface gravity (log g)1.7[9] cgs
Temperature3,700±150[10] K
Metallicity [Fe/H]0.00[10] dex
Rotational velocity (v sin i)2.6±1.1[11] km/s
Age2.19[7] Gyr
Other designations
67 G. Columbae, CD−33°2681, CPD−33°980, GC 7630, HD 41047, HIP 28524, HR 2131, SAO 196413
Database references
SIMBADdata

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]

  1. ^ a b c d e f Cite error: The named reference edr3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1982 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Karchenko2007 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Lafrasse2010 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference Charbonnel2020 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggelton2008 was invoked but never defined (see the help page).