Gliese 581 d: Difference between revisions
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== References == | == References == | ||
[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] | [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] | ||
Density of Gliese581d is about 5645Kg/M3 using earth's density 5520Kg/M3 Mass 7.7Me radius 1.96Re.The 740kg/M3 looks like someone forgot to put 7.7 in the density formula. | |||
== External links == | == External links == | ||
Revision as of 18:52, 3 May 2007
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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.
Discovery
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.
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.
References
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 Density of Gliese581d is about 5645Kg/M3 using earth's density 5520Kg/M3 Mass 7.7Me radius 1.96Re.The 740kg/M3 looks like someone forgot to put 7.7 in the density formula.
External links
See also
es:Gliese 581 d fr:Gliese 581 d it:Gliese 581 d nl:Gliese 581 d fi:Gliese 581 d sv:Gliese 581 d