HD 126209

HD 126209
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Apus
Right ascension 14h 29m 37.00634s[1]
Declination −76° 43′ 44.6977″[1]
Apparent magnitude (V) 6.06±0.01[2]
Characteristics
Spectral type K0/1 III[3]
U−B color index +1.11[4]
B−V color index +1.18[4]
Astrometry
Radial velocity (Rv)−8.1±3.7[5] km/s
Proper motion (μ) RA: −27.950 mas/yr[1]
Dec.: −27.585 mas/yr[1]
Parallax (π)5.8482 ± 0.1281 mas[1]
Distance560 ± 10 ly
(171 ± 4 pc)
Absolute magnitude (MV)+0.18[6]
Details
Mass1.22[7] M☉
Radius16.83[8] R☉
Luminosity196+10
−7[1] L☉
Surface gravity (log g)1.78[7] cgs
Temperature4,622±122[9] K
Metallicity [Fe/H]−0.30[10] dex
Rotational velocity (v sin i)<1[11] km/s
Other designations
11 G. Apodis[12], CPD−76°826, HD 126209, HIP 70874, HR 5389, SAO 257163[13]
Database references
SIMBADdata

HD 126209, also known as HR 5389, is a solitary, orange hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.06,[2] making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 560 light years distant. It appears to be approaching the Solar System with a fairly constrained heliocentric radial velocity of −8.1 km/s.[5] De Mederios et al. (2014) found the radial velocity to be variable, making it a probable spectroscopic binary.[11] Eggen (1993) lists it as a member of the old disk population.[14]

This is an evolved red giant with a spectral classification of K0/1 III.[3] This indicates that it has the spectrum intermediate of a K0 and K1 giant. It has 1.22 times the mass of the Sun[7] and due to its evolved state, expanded to 16.8 times its girth.[8] It radiates 196 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,622 K.[9] HD 126209 is said to be metal deficient, having an iron abundance only half of the Sun's.[10] Like most giant stars, it spins slowly, having a projected rotational velocity lower than 1 km/s.[11]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 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 Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 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 Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Charbonnel2020 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Eggen1993 was invoked but never defined (see the help page).