HD 222060

HD 222060
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 23h 38m 23.88625s[1]
Declination −76° 52′ 10.3567″[1]
Apparent magnitude (V) 5.98±0.01[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K0 II/III[4]
U−B color index +0.65[5]
B−V color index +0.90[5]
Astrometry
Radial velocity (Rv)2.3±0.5[6] km/s
Proper motion (μ) RA: +83.519 mas/yr[1]
Dec.: −25.064 mas/yr[1]
Parallax (π)6.0864 ± 0.0294 mas[1]
Distance536 ± 3 ly
(164.3 ± 0.8 pc)
Absolute magnitude (MV)−0.05[7]
Details[8]
Mass3.20±0.10 M☉
Radius12.6±0.2 R☉
Luminosity102±3 L☉
Surface gravity (log g)2.85±0.06 cgs
Temperature5,175±30 K
Metallicity [Fe/H]+0.05±0.03 dex
Rotational velocity (v sin i)3.7±1[9] km/s
Age318+30
−40[1] Myr
Other designations
84 G. Octantis[10], CPD−77°1583, GC 32840, HD 222060, HIP 116653, HR 8957, SAO 258166[11]
Database references
SIMBADdata

HD 222060, also known as HR 8957, is a solitary, orange hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.98,[2] allowing it to be faintly visible to the naked eye. Based on parallax measurements from GAIA, the object is estimated to be 536 light years distant.[1] It appears to be slowly receding from the Solar System, having a heliocentric radial velocity of 2.3 km/s.[9]

This is an evolved giant star that is currently on the red giant branch,[3] fusing a hydrogen shell around a helium core. HD 222060 a stellar classification of K0 II/III,[4] a K-type star with the blended luminosity class of a giant and a bright giant. It has 3.2 times the mass of the Sun[8] and is currently 318 million years old.[9] Due to its high mass, the object has expanded to an enlarged radius of 12.6 R☉.[8] It radiates 102 times the luminosity of the Sun from its photosphere at an effective temperature of 5,175 K.[8] HD 222060 has a near solar metallicity[8] and spins modestly with a projected rotational velocity of 3.7 km/s.[9]

  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 Cardiel2021 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference Ottoni2022 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference De Medeiros2014 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 SIMBAD was invoked but never defined (see the help page).