HR 8526
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans |
| A | |
| Right ascension | 22h 25m 51.15504s |
| Declination | −75° 00′ 56.4763″ |
| Apparent magnitude (V) | 6.12±0.01 |
| B | |
| Right ascension | 22h 25m 56.54954s |
| Declination | −75° 00′ 52.3437″ |
| Apparent magnitude (V) | 9.35 |
| Characteristics | |
| A | |
| Spectral type | G0 V |
| U−B color index | +0.14 |
| B−V color index | +0.64 |
| B | |
| Spectral type | K2V |
| Astrometry | |
| A | |
| Radial velocity (Rv) | 15±0.2 km/s |
| Proper motion (μ) | RA: +57.385 mas/yr Dec.: +12.835 mas/yr |
| Parallax (π) | 42.7219±0.0196 mas |
| Distance | 76.34 ± 0.04 ly (23.41 ± 0.01 pc) |
| Absolute magnitude (MV) | +4.31 |
| B | |
| Radial velocity (Rv) | 15±0.5 km/s |
| Proper motion (μ) | RA: +33.330 mas/yr Dec.: −3.785 mas/yr |
| Parallax (π) | 42.692 ± 0.2479 mas |
| Distance | 76.4 ± 0.4 ly (23.4 ± 0.1 pc) |
| Absolute magnitude (MV) | +6.92 |
| Orbit | |
| Primary | Ba |
| Companion | Bb |
| 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 M☉ |
| Radius | 1.17 R☉ |
| Luminosity | 1.57 L☉ |
| Surface gravity (log g) | 4.29±0.04 cgs |
| Temperature | 5,935 K |
| Metallicity [Fe/H] | +0.02±0.06 dex |
| Rotational velocity (v sin i) | 3.6 km/s |
| Age | 4.7 Gyr |
| B | |
| Mass | 0.76 (combined) M☉ |
| Other designations | |
| 72 G. Octantis, CD−75°1241, CPD−75°1748, HD 212168, HR 8526, WDS J22259-7501AB | |
| 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. The system is located relatively close at a distance of 76 light years based on Gaia DR3 parallax measurements, but is receding with a heliocentric radial velocity of 15 km/s.
This is a Sun-like star with a stellar classification of G0 V. It has 105% the mass of the Sun and 117% its girth. It radiates 157% the luminosity of the Sun from its photosphere at an effective temperature of 5,935 K, giving it a whitish-yellow hue. HR 8526 has an iron abundance similar to the Sun's and spins modestly with a projected rotational velocity of 3.6 km/s. HD 212168 has a similar age to the Sun; the former is 4.7 billion years old while the latter is 4.6 billion years old.
The B subsystem is located 14″ away along a position angle of 78°. It has a combined mass 76% that of the Sun and take roughly 11 years to orbit each other. Spectral classifications for this star vary from G0-V to K2V. The G0 class has been used as an argument that the two visible components form a purely optical pair, but this has been dismissed as mis-identification or contamination and that the actual spectral class is early or mid K.
DENIS J222644.3-750342 is a cool M8 red dwarf located 264 arcseconds away from HR 8526. In 2012, J.A. Caballero identified it as a companion to the AB system, making it a quadruple star system.