HR 8526

Last updated
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]
Distance 76.34 ± 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]
Distance 76.4 ± 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
Mass 1.05+0.04
−0.03 [12]   M☉
Radius 1.17 [13]   R☉
Luminosity 1.57 [14]   L☉
Surface gravity (log g)4.29±0.04 [12]   cgs
Temperature 5,935 [15]   K
Metallicity [Fe/H]+0.02±0.06 [12]   dex
Rotational velocity (v sin i)3.6 [16]  km/s
Age 4.7 [17]   Gyr
B
Mass 0.76 (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
SIMBAD A
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]

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<span class="mw-page-title-main">HD 27022</span> Star in the constellation Camelopardalis

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<span class="mw-page-title-main">19 Leonis Minoris</span> Spectroscopic binary in the constellation Leo Minor

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HD 208741, also known as HR 8380, is a yellowish-white hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.91, making it faintly visible to the naked eye. Parallax measurements place it at a distance of 211 light years, and it is currently receding with a heliocentric radial velocity of 8 km/s.

HD 183552, also known as HR 7411, is a probable spectroscopic binary located in the southern constellation Telescopium. The system has a combined apparent magnitude of 5.74, allowing it to be faintly visible to the naked eye. Based on parallax measurements from the Gaia spacecraft, it is estimated to be 337 light years distant. The value is horribly constrained, but it appears to receding with a radial velocity of 14 km/s.

<span class="mw-page-title-main">40 Leonis Minoris</span> Binary star system in the constellation of Leo Minor

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<span class="mw-page-title-main">HD 201772</span> Star in the constellation Microscopium

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<span class="mw-page-title-main">HD 22764</span> Double star; Camelopardalis

HD 22764, also known as HR 1112, is an orange hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.78, allowing it to be faintly visible to the naked eye. The object is located relatively far at a distance of approximately 1,770 light years based on Gaia DR3 parallax measurements but is approaching the Solar System with a heliocentric radial velocity of −12.5 km/s. At its current distance, HD 22764's brightness is diminished by 0.66 magnitudes due to interstellar dust.

<span class="mw-page-title-main">HD 204018</span> Visual binary in Microscopium

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References

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  19. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  20. ↑ "HR 8526". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved November 4, 2022.
  21. 1 2 Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . ISSN   0004-6256.
  22. ↑ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009- )". VizieR On-line Data Catalog. Bibcode:2014yCat....1.2023S.
  23. ↑ Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal . 132 (1): 161–170. arXiv: astro-ph/0603770 . Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID   119476992.
  24. ↑ Neill Reid, I.; Cruz, Kelle L.; Kirkpatrick, J. Davy; Allen, Peter R.; Mungall, F.; Liebert, James; Lowrance, Patrick; Sweet, Anne (15 August 2008). "Meeting the Cool Neighbors. X. Ultracool Dwarfs from the 2MASS All-Sky Data Release". The Astronomical Journal. 136 (3): 1290–1311. Bibcode:2008AJ....136.1290R. doi: 10.1088/0004-6256/136/3/1290 . eISSN   1538-3881. ISSN   0004-6256.
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