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| ra = {{RA|03|20|02.943}}<ref name="van Leeuwen2007"/> |
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| ra = {{RA|03|20|02.943}}<ref name="van Leeuwen2007"/> |
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| dec = {{DEC|–28|47|01.80}}<ref name="van Leeuwen2007"/> |
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| dec = {{DEC|–28|47|01.80}}<ref name="van Leeuwen2007"/> |
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| appmag_v = 8.44 |
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| appmag_v = 8.48 |
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{{Starbox character |
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{{Starbox character |
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| class = G9.5V |
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| class = K0V<ref name=Udry2017/> |
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| variable = |
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| variable = |
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| b-v = 0.82 |
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}} |
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{{Starbox astrometry |
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{{Starbox astrometry |
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| absmag_v = |
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{{Starbox detail |
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| source =<ref name=Udry2017>{{citation|arxiv=1705.05153|title=The HARPS search for southern extra-solar planets. XLII. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions|year=2017}}</ref> |
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| mass = 0.7 |
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| radius = |
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| luminosity = 0.49{{±|0.04}} |
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| gravity = 4.37{{±|0.05}} |
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| temperature =5256{{±|29}} |
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| metal_fe = −0.11{{±|0.02}} |
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| rotation = 46.8{{±|4.4}} ] |
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| rotational_velocity =1.1 |
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| age_gyr = |
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{{Starbox catalog |
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{{Starbox catalog |
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| names = ]–29° 1229, ] 15526, ] 1581, ] 168468<ref name="SIMBAD"/> |
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| names = ]–29° 1229, ] 15526, ] 1581, ] 168468<ref name="SIMBAD"/> |
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'''HD 20781''' is a star which is part of a wide ] with ]. The companion star has a very large ] of 252 arcsec, corresponding to 9080 AU at the distance of HD 20782.<ref name=Desidera></ref> Both stars possess their own ]s in ]s. This is the first time that ] in both components of a wide binary system.<ref name=Desidera/><ref name=Sch-20781/><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.|date=2011|display-authors=etal}}</ref> |
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'''HD 20781''' is a star which is part of a wide ] with ]. The companion star has a very large ] of 252 arcsec, corresponding to 9080 AU at the distance of HD 20782.<ref name=Desidera></ref> Both stars possess their own ]s in ]s. This is the first time that ] in both components of a wide binary system.<ref name=Desidera/><ref name=Sch-20781/><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.|date=2011|display-authors=etal}}</ref> |
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The '''HD 20781''' do not have a noticeable ] activity.<ref name=Udry2017/> |
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== Planetary system == |
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== Planetary system == |
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=== HD 20781 === |
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{{OrbitboxPlanet begin |
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{{OrbitboxPlanet begin |
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| table_ref=<ref name=Sch-20781>{{cite web|url=http://exoplanet.eu/star.php?st=HD+20781|title=Notes for star HD 20781|author=Schneider, J|work=The Extrasolar Planets Encyclopaedia|accessdate=2011-09-12}}</ref> |
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| table_ref=<ref name=Sch-20781>{{cite web|url=http://exoplanet.eu/star.php?st=HD+20781|title=Notes for star HD 20781|author=Schneider, J|work=The Extrasolar Planets Encyclopaedia|accessdate=2011-09-12}}</ref> |
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