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HD 20781

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HD 20781
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Fornax
Right ascension 03 20 02.943
Declination –28° 47′ 01.80″
Apparent magnitude (V) 8.44
Characteristics
Spectral type G9.5V
Astrometry
Proper motion (μ) RA: 348.97 ± 0.71 mas/yr
Dec.: –67.69 ± 0.91 mas/yr
Parallax (π)28.27 ± 1.08 mas
Distance115 ± 4 ly
(35 ± 1 pc)
Other designations
CD–29°1229, HIP 15526, LTT 1581, SAO 168468

HD 20781 is a star which is part of a wide binary system with HD 20782. The companion star has a very large angular separation of 252 arcsec, corresponding to 9080 AU at the distance of HD 20782. Both stars possess their own planetary systems in S type orbits. This is the first time that planets have been found in both components of a wide binary system.

Planetary system

HD 20781

The HD 20781 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 12.04 ± 1.11 M🜨 0.169 ± 0.0028 29.15 ± 0.0201 0.11 ± 0.06 — —
c 15.76 ± 1,20 M🜨 0.3456 ± 0.0047 85.131 ± 0.1161 0.28 ± 0.09 — —

See also

References

  1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  2. ^ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
  3. "HD 20781 -- High proper-motion Star". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-09-10.
  4. ^ Properties of planets in binary systems.
  5. ^ Schneider, J. "Notes for star HD 20781". The Extrasolar Planets Encyclopaedia. Retrieved 2011-09-12.
  6. Mayor, M. Marmier,M. Lovis,C. Udry,S. Ségransan,D. Pepe,F. Benz,W. Bertaux,J.-L. Bouchy,F. Dumusque, G. Curto,Lo Mordasini,C. Queloz,D. Santos,N. C.; et al. (2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497 .{{cite arXiv}}: CS1 maint: multiple names: authors list (link)

External links

The HD 20781/HD 20782 system
HD 20781
  • HD 20782
  • b


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