HD 220773
| 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 |
HD 220773 is a 7th-magnitude star approximately 165 light years away in the constellation of Pegasus.
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[]
- ^ a b c d e 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
- ^ a b 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
Coordinates: 
23h 26m 27.44474s, +08° 38′ 37.8389″
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Categories:
- Durchmusterung objects
- Henry Draper Catalogue objects
- Hipparcos objects
- Pegasus (constellation)
- Planetary systems with one confirmed planet
- G-type main-sequence stars
- 2MASS objects
- Main-sequence-star stubs