https://ideawaza.com/api.php?action=feedcontributions&feedformat=atom&user=81.5.40.10IdeaWazaWiki - User contributions [en]2026-09-29T10:47:21ZUser contributionsMediaWiki 1.46.0https://ideawaza.com/index.php?title=Gliese_581_d&diff=45729Gliese 581 d2008-06-21T19:48:07Z<p>81.5.40.10: /* Climate and habitability */</p>
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<div>{{Planetbox begin <br />
| name = Gliese 581 d<br />
}}<br />
{{Planetbox image<br />
| image = Gliese 581 d-v1.jpg<br />
| caption = Artistic representation of a panoramic view of <br>Gliese 581 d, showing speculative moons.<br />
}}<br />
{{Planetbox star <br />
| star = [[Gliese 581]]<br />
| constell = [[Libra (constellation)|Libra]]<br />
| RA = {{RA|15|19|26}} <br />
| DEC = {{DEC|&minus;07|43|20}}<br />
| dist_ly = 20.4<br />
| dist_pc = 6.27 <br />
| class = M2.5V<br />
}} <br />
{{Planetbox orbit <br />
| period = 84.4<br />
| semimajor = .25<br />
| eccentricity = .2<br />
}}<br />
{{Planetbox character<br />
| mass_earth = >7.7<br />
}} <br />
{{Planetbox discovery <br />
| discovery_date = [[2007-04-24]]<br />
| discoverers = [[Stéphane Udry|Udry]] et al.<br />
| discovery_method = Radial velocity<br />
| discovery_status = unpublished<br />
}} <br />
{{Planetbox end}}<br />
<br />
'''Gliese 581 d''' ({{pronEng|ˈgliːzə}}), also known as '''Wolf 562 d''' and '''HIP 74995 d''', is a "[[super-Earth]]" or large [[terrestrial planet| terrestrial]] [[extrasolar planet]] orbiting the [[red dwarf]] [[star]] [[Gliese 581]].<br /> Gliese 581 d is near the outer edge of the [[habitable zone]]. <br />
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== Discovery ==<br />
The planet was discovered by the team of [[Stéphane Udry]] of the [[Geneva Observatory]] in [[Switzerland]] using the [[HARPS]] instrument on the [[European Southern Observatory]] 3.6 [[meter]] [[telescope]] in [[La Silla]], [[Chile]] on 24 [[April 2007]]. Udry's team employed the [[radial velocity]] technique, in which the size and [[mass]] of a [[planet]] are determined based on the small perturbations it induces in its parent star’s [[orbit]] via [[gravity]].<br />
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The team is confident that the planet exists but recognizes that unlikely events could mimic its existence. They believe the issue will be settled by upcoming studies.<br />
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== Climate and habitability ==<br />
Although Gliese 581 d orbits outside the theoretical [[habitable zone]] of its star, scientists surmise that conditions on the planet may be conducive to supporting life.<ref>http://www.space.com/scienceastronomy/070618_mm_gliese_581d.html</ref> Scientists originally believed that Gliese 581 d would in fact be too cold for [[liquid]] [[water]] to exist, and therefore could not support [[life]] as we understand it. However, due to a theorized [[greenhouse effect]], research now suggests that [[atmospheric]] conditions on the planet could create [[temperature]]s at which liquid water can exist, and therefore the planet may be capable of supporting life. However, these conditions are based on models of the planet, and have not been directly observed.<br />
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==References==<br />
<references /><br />
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== External links ==<br />
*[http://vo.obspm.fr/exoplanetes/encyclo/planet.php?p1=Gl+581&p2=d '''Extrasolar Planets Encyclopaedia''': Gl 581 d]<br />
*[http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=gl+581&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2005&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=200 '''SIMBAD''': V* HO Lib -- Variable Star]<br />
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[[Category:Extrasolar planets]]<br />
[[Category:Libra constellation]]<br />
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