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 mas [3] |
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]
In 2012, two planets, named HD 207832 b and HD 207832 c, 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 |
---|---|---|---|---|---|---|
b (unconfirmed) | ≥ 0.56±0.091 MJ | 0.586±0.032 | 160.07±0.23 | 0.197±0.053 | — | — |
c (unconfirmed) | ≥0.73+0.18 −0.05 M🜨 |
2.112+0.087 −0.045 |
1155.7+71.9 −37.0 |
0.27+0.22 −0.10 |
— | — |