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| == HD 20781 == | |||
| {{AFC submission|||ts=20120114200059|u=189.13.95.252|ns=5}} | |||
| {{Starbox short | {{Starbox short | ||
| | name = ] 20781 | | name = ] 20781 | ||
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| }} | }} | ||
| '''HD 20781''' |
'''HD 20781''' is a star which is part of a wide binary system with ]. 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.<ref>http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...462..345DFUL</ref> <ref>{{cite news|title=Notes for star HD 20781 |cite web|url=http://exoplanet.eu/star.php?st=HD+20781|author=Schneider, J|work=The Extrasolar Planets Encyclopaedia|accessdate=2011-09-12}}</ref><ref>{{cite arXiv|eprint=1109.2497|class=astro-ph|title=The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets|author=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.''|year=2011}}</ref> | ||
| == Planetary system == | == Planetary system == | ||
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| == See also == | == See also == | ||
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Revision as of 21:44, 14 January 2012
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 03 20 02.9428 |
| Declination | –28° 47′ 01.799″ |
| Apparent magnitude (V) | 8.44 |
| Distance | 117 ly (36 pc) |
| Spectral type | G9.5V |
| 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. 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
References
- http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...462..345DFUL
- Schneider, J. "Notes for star HD 20781 |cite web". 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}}: Explicit use of et al. in:|author=(help)CS1 maint: multiple names: authors list (link) - Schneider, J. "Notes for star HD 20781". The Extrasolar Planets Encyclopaedia. Retrieved 2011-09-12.
External links
- "Notes for star HD 20781". The Extrasolar Planets Encyclopaedia. Retrieved 2011.
{{cite web}}: Check date values in:|accessdate=(help)
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