HD 120213

HD 120213
Observation data
Epoch J2000      Equinox J2000
Constellation Chamaeleon
Right ascension 13h 55m 38.8756s[1]
Declination −82° 39′ 58.2871″[1]
Apparent magnitude (V) 5.94[2]
Characteristics
Spectral type K2 III: CN−1 CH −2.5[3]
U−B color index +1.59[2]
B−V color index +1.45[2]
Astrometry
Radial velocity (Rv)−35.2±0.6[4] km/s
Proper motion (μ) RA: −24.805 mas/yr[1]
Dec.: −23.580 mas/yr[1]
Parallax (π)3.585 ± 0.0375 mas[1]
Distance910 ± 10 ly
(279 ± 3 pc)
Absolute magnitude (MV)−0.98[5]
Details
Mass4.2+1.2
−0.7[6] M☉
Radius38.6+7.5
−5.1[7] R☉
Luminosity503±13[7] L☉
Surface gravity (log g)1.95±0.26[6] cgs
Temperature4,401+327
−376[7] K
Metallicity [Fe/H]−0.25±0.10[6] dex
Rotational velocity (v sin i)<1[8] km/s
Other designations
50 G. Chamaeleontis, CPD−82°585, GC 18731, HD 120213, HIP 68009, HR 5188, SAO 258683[9][10]
Database references
SIMBADdata

HD 120213 (HR 5188) is a solitary star in the southern circumpolar constellation Chamaeleon. It is faintly visible to the naked eye with an apparent magnitude of 5.94 and is estimated to be 910 light years away from the Solar System. However, the object is drifting closer with a heliocentric radial velocity of −35 km/s.

HD 120213 has a stellar classification of K2 III: CN−1 CH −2.5,[3] indicating that its a red giant with an under abundance of CH molecules and cyano radicals in its spectrum. It has also been classified as a mild barium star,[11] but there is uncertainty about the spectral class. It has 4.2 times the mass of the Sun[6] and an enlarged radii of 38.6 R☉.[7] It shines at 503 times the luminosity of the Sun from its photosphere at an effective temperature of 4,401 K,[7] giving it an orange hue. HD 120213 has a metallicity 56% that of the Sun[6] and spins with a projected rotational velocity too low to be accurately measured.[8]

  1. ^ a b c d Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Palacios2016 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference DR2 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Lu1991 was invoked but never defined (see the help page).