HD 207832
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Piscis Austrinus |
| Right ascension | 21h 52m 36.2810s[1] |
| Declination | −26° 01′ 35.6133″[1] |
| Apparent magnitude (V) | 8.79 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | G5V[2] |
| Astrometry | |
| Radial velocity (Rv) | -16.481±0.185[3] km/s |
| Proper motion (μ) | RA: 129.310[3] mas/yr Dec.: -143.132[3] mas/yr |
| Parallax (π) | 16.8897 ± 0.0151[3] mas |
| Distance | 193.1 ± 0.2 ly (59.21 ± 0.05 pc) |
| Details[4] | |
| Mass | 1.08±0.01 M☉ |
| Radius | 0.97±0.02 R☉ |
| Luminosity | 0.78±0.09[2] L☉ |
| Surface gravity (log g) | 4.61±0.04 cgs |
| Temperature | 5764±15 K |
| Metallicity [Fe/H] | 0.17±0.01 dex |
| Rotation | 17.8 d[5] |
| Age | 0.74±0.62 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 207832 is a G-type main-sequence star. Its surface temperature is 5764±15 K.[4] HD 207832 is slightly enriched compared to the Sun in its concentration of heavy elements, with a metallicity Fe/H index of 0.17±0.01 and is much younger at an age of 0.74±0.62 billion years. Kinematically, it belongs to the thin disk of the Milky Way.[4]
A multiplicity study in 2014 detected a candidate comoving stellar companion - a red dwarf star or brown dwarf with a spectral class M6.5, at a very wide projected separation of 38.57′ (2.0 light years)[6]
Planetary system[]
In 2012, two planets, named and , were discovered by the radial velocity method on wide, eccentric orbits.[5] The planetary system would remain stable even if the planetary orbits are coplanar.[7]
Although discovery of the inner planet was confirmed[2] in 2018, the discovery of both planets was suspected to be a false positive in 2020, as newer radial velocity data do not support the existence of the planets.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| (unconfirmed) | ≥ 0.56±0.091 MJ | 0.586±0.032 | 160.07±0.23 | 0.197±0.053 | — | — |
| (unconfirmed) | ≥0.73+0.18 −0.05 M |