HR 8526

HR 8526
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
A
Right ascension 22h 25m 51.15504s[1]
Declination −75° 00′ 56.4763″[1]
Apparent magnitude (V) 6.12±0.01[2]
B
Right ascension 22h 25m 56.54954s[3]
Declination −75° 00′ 52.3437″[3]
Apparent magnitude (V) 9.35[4]
Characteristics
A
Spectral type G0 V[5]
U−B color index +0.14[6]
B−V color index +0.64[6]
B
Spectral type K2V[7]
Astrometry
A
Radial velocity (Rv)15±0.2[8] km/s
Proper motion (μ) RA: +57.385 mas/yr[1]
Dec.: +12.835 mas/yr[1]
Parallax (π)42.7219 ± 0.0196 mas[1]
Distance76.34 ± 0.04 ly
(23.41 ± 0.01 pc)
Absolute magnitude (MV)+4.31[4]
B
Radial velocity (Rv)15±0.5[9] km/s
Proper motion (μ) RA: +33.330 mas/yr[3]
Dec.: −3.785 mas/yr[3]
Parallax (π)42.692 ± 0.2479 mas[3]
Distance76.4 ± 0.4 ly
(23.4 ± 0.1 pc)
Absolute magnitude (MV)+6.92[10]
Orbit[11]
PrimaryBa
CompanionBb
Period (P)11 yr
Semi-major axis (a)0.254″
Inclination (i)87.3°
Longitude of the node (Ω)235°
Periastron epoch (T)2022.21
Argument of periastron (ω)
(secondary)		270°
Details
A
Mass1.05+0.04
−0.03[12] M☉
Radius1.17[13] R☉
Luminosity1.57[14] L☉
Surface gravity (log g)4.29±0.04[12] cgs
Temperature5,935[15] K
Metallicity [Fe/H]+0.02±0.06[12] dex
Rotational velocity (v sin i)3.6[16] km/s
Age4.7[17] Gyr
B
Mass0.76 (combined)[18] M☉
Other designations
72 G. Octantis[19], CD−75°1241, CPD−75°1748, HD 212168, HR 8526, WDS J22259-7501AB[20]
A: FK5 3789, GC 31308, HIP 110712, SAO 258036
B: HIP 110719
Database references
SIMBADA
B

HR 8526, also known as HD 212168, is the primary of a triple star located in the southern circumpolar constellation Octans. The star and its companion have apparent magnitudes of 6.12 and 9.36 respectively.[2][4] The system is located relatively close at a distance of 76 light years based on Gaia DR3 parallax measurements,[3][1] but is receding with a heliocentric radial velocity of 15 km/s.[8][9]

This is a Sun-like star with a stellar classification of G0 V.[5] It has 105% the mass of the Sun[12] and 117% its girth.[13] It radiates 157% the luminosity of the Sun[14] from its photosphere at an effective temperature of 5,935 K,[15] giving it a whitish-yellow hue. HR 8526 has an iron abundance similar to the Sun's[12] and spins modestly with a projected rotational velocity of 3.6 km/s.[16] HD 212168 has a similar age to the Sun; the former is 4.7 billion years old[17] while the latter is 4.6 billion years old.

The B subsystem is located 14″ away along a position angle of 78°.[21] It has a combined mass 76% that of the Sun[18] and take roughly 11 years to orbit each other.[11] Spectral classifications for this star vary from G0-V to K2V.[7][22] The G0 class has been used as an argument that the two visible components form a purely optical pair,[23] but this has been dismissed as mis-identification or contamination and that the actual spectral class is early or mid K.[10]

DENIS J222644.3-750342 is a cool M8 red dwarf[24] located 264 arcseconds away from HR 8526.[21] In 2012, J.A. Caballero identified it as a companion to the AB system, making it a quadruple star system.[10]

  1. ^ a b c d e 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 c d e Cite error: The named reference GaiaDR3B was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference msc was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Valenti2005 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Caballero2012 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Tokovinin2019 was invoked but never defined (see the help page).
  12. ^ a b c d e Cite error: The named reference Ramírez2012 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference Ghezzi2010 was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  15. ^ a b Cite error: The named reference Netopil2017 was invoked but never defined (see the help page).
  16. ^ a b Cite error: The named reference LDA2021 was invoked but never defined (see the help page).
  17. ^ a b Cite error: The named reference Bensby2014 was invoked but never defined (see the help page).
  18. ^ a b Cite error: The named reference Tokovinin2014 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  20. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  21. ^ a b Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  22. ^ Cite error: The named reference skiff2014 was invoked but never defined (see the help page).
  23. ^ Cite error: The named reference gray2006 was invoked but never defined (see the help page).
  24. ^ Cite error: The named reference Neill Reid2008 was invoked but never defined (see the help page).