HD 207832

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]

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 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
CD−26 15858, HIP 107985, TYC 6589-761-1, GSC 06956-00378, 2MASS J21523626-2601352[1]
Database references
SIMBAD	data

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 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]

The HD 207832 planetary system^[2][5]

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	—	—