HD 220773
HD 220773 is a 7th-magnitude star approximately 165 light years away in the constellation of Pegasus.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h 26m 27.44474s |
| Declination | +08° 38′ 37.8389″[1] |
| Apparent magnitude (V) | 7.1 |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | G0V |
| B−V color index | 0.632 |
| Astrometry | |
| Radial velocity (Rv) | -37.735[1] km/s |
| Proper motion (μ) | RA: 27.119[1] mas/yr Dec.: -222.294[1] mas/yr |
| Parallax (π) | 19.7694 ± 0.0669[1] mas |
| Distance | 165.0 ± 0.6 ly (50.6 ± 0.2 pc) |
| Details[2][3][4] | |
| Mass | 1.16 M☉ |
| Surface gravity (log g) | 4.24 cgs |
| Temperature | 5940±100 K |
| Metallicity [Fe/H] | 0.09 dex |
| Rotational velocity (v sin i) | 3 km/s |
| Age | 4.4 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The survey in 2015 have ruled out the existence of any additional stellar companions at projected distances from 31 to 337 astronomical units.[6]
Planetary system
The star is orbited by an exoplanet discovered in 2012. It is around 1.45 times the mass of Jupiter, orbiting very eccentric orbit with semimajor axis of around 5 AU and taking 10.2 years to complete an orbit.[4] If additional inner terrestrial planets do exist in HD 220773 system, these must have eccentric orbits for planetary system to remain stable.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.45±0.3 MJ | 4.94±0.2 | 3724.7±463 | 0.51±0.1 | — | — |
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Lanza, A. F.; Malavolta, L.; Benatti, S.; Desidera, S.; Bignamini, A.; Bonomo, A. S.; Esposito, M.; Figueira, P.; Gratton, R.; Scandariato, G.; Damasso, M.; Sozzetti, A.; Biazzo, K.; Claudi, R. U.; Cosentino, R.; Covino, E.; Maggio, A.; Masiero, S.; Micela, G.; Molinari, E.; Pagano, I.; Piotto, G.; Poretti, E.; Smareglia, R.; Affer, L.; Boccato, C.; Borsa, F.; Boschin, W.; Giacobbe, P.; et al. (2018), "The GAPS Programme with HARPS-N at TNG XVII. Line profile indicators and kernel regression as diagnostics of radial-velocity variations due to stellar activity in solar-like stars", Astronomy & Astrophysics, A155: 616, arXiv:1804.07039, doi:10.1051/0004-6361/201731010, S2CID 55707328
- Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (2016), "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes", The Astronomical Journal, 153 (3): 136, arXiv:1609.04389, doi:10.3847/1538-3881/aa5df3, S2CID 119219062
- Robertson, Paul; Endl, Michael; Cochran, William D.; MacQueen, Phillip J.; Wittenmyer, Robert A.; Horner, J.; Brugamyer, Erik J.; Simon, Attila E.; Barnes, Stuart I.; Caldwell, Caroline (2012). "The McDonald Observatory Planet Search: New Long-period Giant Planets and Two Interacting Jupiters in the HD 155358 System". The Astrophysical Journal. 749 (1): 17 pp. arXiv:1202.0265. Bibcode:2012ApJ...749...39R. doi:10.1088/0004-637X/749/1/39. S2CID 59273311.
- "HD 220773". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 September 2020.
- Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 450 (3): 3127–3136. doi:10.1093/mnras/stv771. Retrieved 19 June 2020.
- Antoniadou, Kyriaki I.; Libert, Anne-Sophie (2018), "Puzzling out the coexistence of terrestrial planets and giant exoplanets. The 2/1 resonant periodic orbits", Astronomy & Astrophysics, A60: 615, arXiv:1804.04936, doi:10.1051/0004-6361/201732058, S2CID 119231621
- Planet HD 220773 b at exoplanet.eu
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