HD 220773

HD 220773 is a 7th-magnitude star approximately 165 light years away in the constellation of Pegasus.

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 mas[1]
Distance165.0 ± 0.6 ly
(50.6 ± 0.2 pc)
Details[2][3][4]
Mass1.16 M
Surface gravity (log g)4.24 cgs
Temperature5940±100 K
Metallicity [Fe/H]0.09 dex
Rotational velocity (v sin i)3 km/s
Age4.4 Gyr
Other designations
BD+07 5030, Gaia DR2 2761142326076104192, HIP 115697, SAO 128181, 2MASS J23262744+0838376[5]
Database references
SIMBADdata

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]

The HD 220773 planetary system[8]
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

  1. 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.
  2. 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, Bibcode:2018A&A...616A.155L, doi:10.1051/0004-6361/201731010, S2CID 55707328
  3. 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, Bibcode:2017AJ....153..136S, doi:10.3847/1538-3881/aa5df3, S2CID 119219062
  4. 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.
  5. "HD 220773". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 September 2020.
  6. 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. Bibcode:2015MNRAS.450.3127M. doi:10.1093/mnras/stv771. Retrieved 19 June 2020.
  7. 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, Bibcode:2018A&A...615A..60A, doi:10.1051/0004-6361/201732058, S2CID 119231621
  8. Planet HD 220773 b at exoplanet.eu
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