https://ideawaza.com/api.php?action=feedcontributions&feedformat=atom&user=207.22.0.0%2F16IdeaWazaWiki - User contributions [en]2026-09-29T17:38:05ZUser contributionsMediaWiki 1.46.0https://ideawaza.com/index.php?title=Gliese_581_d&diff=45681Gliese 581 d2007-06-06T16:04:53Z<p>207.22.18.71: </p>
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<div>{{Current|date=April 2007}}<br />
{{Planetbox begin <br />
| name = Gliese 581 d<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 />
| class = M2.5V<br />
}} <br />
{{Planetbox orbit <br />
| period = 84.4<br />
| semimajor = .25<br />
| eccentricity = .2<br />
| ang_dist = 39.936<br />
}}<br />
{{Planetbox character<br />
| mass_earth = >7.7<br />
| radius_earth = 1.96 {{Fact|date=May 2007}}<br />
| density = 730.41 {{Fact|date=May 2007}}<br />
}} <br />
{{Planetbox discovery <br />
| discovery_date = 2007-04-23<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| discovery_status = unpublished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''' is an [[extrasolar planet]] orbiting the [[red dwarf]] [[star]] [[Gliese 581]]. Due to its mass it can be categorized as a [[Super-earth]].<br />
<br />
Gliese 581 d is near the outer edge of the Habitable zone. <ref>{{cite web |url=http://arxiv.org/PS_cache/arxiv/pdf/0705/0705.3758v1.pdf |title=The Habitability of Super-Earths in Gliese 581 |accessdate=2007-05-29 }}</ref><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]]. 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 />
<br />
{| class="wikitable" align="left"<br />
|-<br />
! Planet<br />
! Earth<br />
|-bgcolor="#000000" <br />
| [[Image:Circle - black simple.svg|196px]]<br />
| [[Image:The Earth seen from Apollo 17.jpg|100px]]<br />
|}<br />
{{clear}}<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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== References ==<br />
[http://obswww.unige.ch/~udry/udry_preprint.pdf Udry et al. (2007). "The HARPS search for southern extra-solar planets, XI. An habitable super-Earth (5 M⊕) in a 3-planet system". Astronomy and Astrophysics preprint]<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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{{Gliese 581}}<br />
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[[Category:Extrasolar planets]]<br />
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[[sv:Gliese 581 d]]</div>207.22.18.71