| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Piscis Austrinus |
| Right ascension | 21 52 36.2810 |
| Declination | −26° 01′ 35.6133″ |
| Apparent magnitude (V) | 8.79 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | G5V |
| Astrometry | |
| Radial velocity (Rv) | -16.481±0.185 km/s |
| Proper motion (μ) | RA: 129.310 mas/yr Dec.: -143.132 mas/yr |
| Parallax (π) | 16.8897 ± 0.0151 mas |
| Distance | 193.1 ± 0.2 ly (59.21 ± 0.05 pc) |
| Details | |
| Mass | 1.08±0.01 M☉ |
| Radius | 0.97±0.02 R☉ |
| Luminosity | 0.78±0.09 L☉ |
| Surface gravity (log g) | 4.61±0.04 cgs |
| Temperature | 5764±15 K |
| Metallicity | 0.17±0.01 dex |
| Rotation | 17.8 d |
| Age | 0.74±0.62 Gyr |
| Other designations | |
| CD−26 15858, HIP 107985, TYC 6589-761-1, GSC 06956-00378, 2MASS J21523626-2601352 | |
| Database references | |
| SIMBAD | data |
HD 207832 is a G-type main-sequence star. Its surface temperature is 5764±15 K. 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.
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)
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. The planetary system would remain stable even if the planetary orbits are coplanar.
Although discovery of the inner planet was confirmed 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.
| 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 −0.05 M🜨 |
2.112 −0.045 |
1155.7 −37.0 |
0.27 −0.10 |
— | — |
References
- ^ "HD 207832". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-20.
- ^ Ment, Kristo; Fischer, Debra A.; Bakos, Gaspar; Howard, Andrew W.; Isaacson, Howard (2018), "Radial velocities from the N2K Project: 6 new cold gas giant planets orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810", The Astronomical Journal, 156 (5): 213, arXiv:1809.01228, Bibcode:2018AJ....156..213M, doi:10.3847/1538-3881/aae1f5, S2CID 119243619
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ Maldonado, J.; Villaver, E.; Eiroa, C. (2018), "Chemical fingerprints of hot Jupiter planet formation", Astronomy & Astrophysics, 612: A93, arXiv:1712.01035, Bibcode:2018A&A...612A..93M, doi:10.1051/0004-6361/201732001, S2CID 119458710
- ^ Haghighipour, Nader; Butler, R. Paul; Rivera, Eugenio J.; Henry, Gregory W.; Vogt, Steven S. (2012), "The Lick-Carnegie Survey: A New Two-Planet System Around the Star HD 207832", The Astrophysical Journal, 756 (1): 91, arXiv:1207.2806, Bibcode:2012ApJ...756...91H, doi:10.1088/0004-637X/756/1/91, S2CID 1137984
- Lodieu, N.; Perez-Garrido, A.; Bejar, V. J. S.; Gauza, B.; Ruiz, M. T.; Rebolo, R.; Pinfield, D. J.; Martin, E. L. (2014), "Binary frequency of planet-host stars at wide separations. A new brown dwarf companion to a planet-host star", Astronomy & Astrophysics, A120: 569, arXiv:1408.1208, Bibcode:2014A&A...569A.120L, doi:10.1051/0004-6361/201424210, S2CID 118516214
- Anderson, Kassandra R.; Lai, Dong (2017), "Moderately eccentric warm Jupiters from secular interactions with exterior companions", Monthly Notices of the Royal Astronomical Society, 472 (3): 3692–3705, arXiv:1706.00084, Bibcode:2017MNRAS.472.3692A, doi:10.1093/mnras/stx2250, S2CID 119260335
- Luhn, Jacob K.; Wright, Jason T.; Howard, Andrew W.; Isaacson, Howard (2020), "Astrophysical Insights into Radial Velocity Jitter from an Analysis of 600 Planet-search Stars", The Astronomical Journal, 159 (5): 235, arXiv:2004.13734, Bibcode:2020AJ....159..235L, doi:10.3847/1538-3881/ab855a, S2CID 216642215
