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| {{Reflist|refs= | {{Reflist|refs= | ||
| <ref name="Roman1987">{{cite journal | title=Identification of a Constellation From a Position | url=http://articles.adsabs.harvard.edu/full/1987PASP...99..695R | last1=Roman | first1=Nancy G. | journal=Publications of the Astronomical Society of the Pacific | volume=99 | issue=617 | pages=695–699 | date=1987 | bibcode=1987PASP...99..695R | doi=10.1086/132034 }} </ref> | <ref name="Roman1987">{{cite journal | title=Identification of a Constellation From a Position | url=http://articles.adsabs.harvard.edu/full/1987PASP...99..695R | last1=Roman | first1=Nancy G. | journal=Publications of the Astronomical Society of the Pacific | volume=99 | issue=617 | pages=695–699 | date=1987 | bibcode=1987PASP...99..695R | doi=10.1086/132034 | doi-access=free }} </ref> | ||
| <ref name="SIMBAD">{{cite web | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+20781 | title=HD 20781 -- High proper-motion Star | website=] Astronomical Database | publisher=] | accessdate=2014-09-10}}</ref> | <ref name="SIMBAD">{{cite web | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+20781 | title=HD 20781 -- High proper-motion Star | website=] Astronomical Database | publisher=] | accessdate=2014-09-10}}</ref> | ||
Revision as of 16:53, 15 April 2020
| 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 |
| Distance | 115 ± 4 ly (35 ± 1 pc) |
| Other designations | |
| CD–29° 1229, HIP 15526, LTT 1581, SAO 168468 | |
| Database references | |
| SIMBAD | data |
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
| 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
- List of extrasolar planets
- XO-2, a wide binary star in the constellation Lynx
References
- 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
- ^ 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
- "HD 20781 -- High proper-motion Star". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-09-10.
- ^ Properties of planets in binary systems.
- ^ Schneider, J. "Notes for star HD 20781". The Extrasolar Planets Encyclopaedia. Retrieved 2011-09-12.
- 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
- "Notes for star HD 20781". The Extrasolar Planets Encyclopaedia. Retrieved 2011.
{{cite web}}: Check date values in:|accessdate=(help)
| The HD 20781/HD 20782 system | |
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| HD 20781 | |
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