Chi Octantis

χ Octantis
Location of χ Oct (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 18h 54m 47.14062s[1]
Declination −87° 36′ 21.0359″[1]
Apparent magnitude (V) 5.28±0.01[2]
Characteristics
Spectral type K3 III[3]
U−B color index +1.60[4]
B−V color index +1.28[4]
Astrometry
Radial velocity (Rv)33.6±3.1[5] km/s
Proper motion (μ) RA: −36.555 mas/yr[1]
Dec.: −135.715 mas/yr[1]
Parallax (π)12.5114 ± 0.0730 mas[1]
Distance261 ± 2 ly
(79.9 ± 0.5 pc)
Absolute magnitude (MV)+0.81[6]
Details
Mass1.25±0.33[7] M☉
Radius15.6±0.8[8] R☉
Luminosity73.6±0.7[9] L☉
Surface gravity (log g)2.19[10] cgs
Temperature4,266+99
−97[7] K
Metallicity [Fe/H]+0.10[10] dex
Rotational velocity (v sin i)<1[11] km/s
Other designations
χ Oct, 30 G. Octantis[12], CD−87°92, CPD−87°274, FK5 922, GC 25207, HD 164461, HIP 92824, HR 6721, SAO 258799[13]
Database references
SIMBADdata

Chi Octantis, Latinized from χ Octantis, is a solitary star[14] located in the southern circumpolar constellation Octans. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.28.[2] The object is located relatively close at a distance of 261 light years based on Gaia EDR3 parallax measurements,[1] but it is receding with a heliocentric radial velocity 33.6 km/s.[5] At its current distance, Chi Octantis' brightness is diminished by 0.24 magnitudes due to interstellar dust.[15] It has an absolute magnitude of +0.81.[6]

Chi Octantis is an evolved red giant with a stellar classification of K3 III.[3] It has 125% the mass of the Sun and an enlarged radius of 14.45 R☉ due to its evolved state.[7] It radiates 73.6 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 4,266 K.[7] Chi Octantis is metal enriched with an iron abundance 126% that of the Sun ([Fe/H] = +0.10)[10] and spins slowly with a projected rotational velocity less than 1 km/s−1.[11]

  1. ^ a b c d e 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 Keenan1989 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. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference A.P1999 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Anders2019 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 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 Eggleton2008 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).