HD 213402

HD 213402
Location of HD 213402 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 22h 35m 26.52327s[1]
Declination −78° 46′ 17.7049″[1]
Apparent magnitude (V) 6.14±0.01[2]
Characteristics
Evolutionary stage red giant branch[1]
Spectral type K1 III[3]
U−B color index +1.35[4]
B−V color index +1.38[4]
Astrometry
Radial velocity (Rv)−12.8±0.4[5] km/s
Proper motion (μ) RA: +53.718 mas/yr[1]
Dec.: −7.451 mas/yr[1]
Parallax (π)3.5469 ± 0.0256 mas[1]
Distance920 ± 7 ly
(282 ± 2 pc)
Absolute magnitude (MV)−1.15[6]
Details
Mass1.17[7] M☉
Radius44.5±2.3[8] R☉
Luminosity471±8[9] L☉
Surface gravity (log g)1.16[10] cgs
Temperature4,481±122[11] K
Metallicity [Fe/H]−0.07[7] dex
Rotational velocity (v sin i)<1.0[12] km/s
Other designations
73 G. Octantis[13], CPD−79°1206, FK5 3807, GC 31498, HD 213402, HIP 111504, HR 8577, SAO 258049, TIC 273651959[14]
Database references
SIMBADdata

HD 213402 (HR 8577; 73 G. Octantis) is a solitary star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.14,[2] placing it near the limit for naked eye visibility. The object is located relatively far at a distance of 920 light-years based on Gaia DR3 parallax measurements,[1] but it is drifting closer with a heliocentric radial velocity of −12.8 km/s.[5] At its current distance, HD 213402's brightness is diminshed by 0.45 magnitudes due to interstellar extinction[15] and it has an absolute magnitude of −1.15.[6]

HD 213402 has a stellar classification of K1 III,[3] indicating that it is an evolved K-type giant. It has a comparable mass to the Sun[7] but it has expanded to 44.5 times the radius of the Sun.[8] It radiates 471 times the luminosity of the Sun[9] from its enlarged photosphere at an effective temperature of 4,481 K,[11] giving it the typical orange hue of a K-type star. Gaia DR3 stellar evolution models place it on the red giant branch and yield a larger radius of 50.9 R☉ and a higher luminosity of 825 L☉.[1] HD 213402 is slightly metal deficient with an iron abundance of [Fe/H] = −0.07 or 85% of the Sun's abundance.[7] Like many giant stars it rotates slowly, but its projected rotational velocity is too low to be measured accurately.[12]

  1. ^ a b c d e f g 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. ^ 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 Anders2019 was invoked but never defined (see the help page).
  8. ^ a b 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. ^ Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD 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).