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- HR_8799_d abstract "HR 8799 d is an extrasolar planet located approximately 129 light-years away in the constellation of Pegasus, orbiting the 6th magnitude Lambda Boötis star HR 8799. It has a mass between 5 and 10 Jupiter masses and a radius from 20 to 30% larger than Jupiter's. The planet orbits at 24 AU from HR 8799 with an eccentricity greater than 0.04 and a period of 100 years. Upon initial discovery, it was the innermost known planet in the HR 8799 system, but e, discovered later, is now known to be closer to their parent star. Along with two other planets orbiting HR 8799, this planet was discovered on November 13, 2008 by Marois et al., using the Keck and Gemini observatories in Hawaii. These planets were discovered using the direct imaging technique.Near infrared spectroscopy from 995 to 1769 nanometers made with the Palomar Observatory show evidence of Acetylene, Methane, and Carbon Dioxide, but Ammonia is not definitively detected.".
- HR_8799_d thumbnail Exoplanet_Comparison_HR_8799_d.png?width=300.
- HR_8799_d wikiPageExternalLink planete.php?etoile=HR+8799&planete=d.
- HR_8799_d wikiPageID "20239641".
- HR_8799_d wikiPageRevisionID "640884579".
- HR_8799_d appMag "5.964".
- HR_8799_d class "kA5 hF0 mA5 V; λ Boo".
- HR_8799_d constell Pegasus_(constellation).
- HR_8799_d density "4".
- HR_8799_d discoverers "Marois et al.".
- HR_8799_d discoveryDate "2008-11-13".
- HR_8799_d discoveryMethod Methods_of_detecting_exoplanets.
- HR_8799_d discoverySite "Keck and Geminiobservatories in Hawaii".
- HR_8799_d discoveryStatus "Published".
- HR_8799_d distLy "129".
- HR_8799_d distPc "39".
- HR_8799_d eccentricity ">0.04".
- HR_8799_d epoch "2008-09-18".
- HR_8799_d hasPhotoCollection HR_8799_d.
- HR_8799_d mass "7".
- HR_8799_d periodYear "~100".
- HR_8799_d planet "d".
- HR_8799_d positionAngle "200.36".
- HR_8799_d radius "1.2".
- HR_8799_d semimajor "~24".
- HR_8799_d semimajorGm "~3600".
- HR_8799_d separation "24".
- HR_8799_d separationMas "621".
- HR_8799_d simbad "1.88694144E10".
- HR_8799_d star HR_8799.
- HR_8799_d star "HR+8799".
- HR_8799_d temperature "1090".
- HR_8799_d subject Category:Exoplanets_detected_by_direct_imaging.
- HR_8799_d subject Category:Exoplanets_discovered_in_2008.
- HR_8799_d subject Category:Giant_planets.
- HR_8799_d subject Category:HR_8799.
- HR_8799_d subject Category:Pegasus_(constellation).
- HR_8799_d type CelestialBody.
- HR_8799_d type Planet.
- HR_8799_d type Thing.
- HR_8799_d type Q634.
- HR_8799_d comment "HR 8799 d is an extrasolar planet located approximately 129 light-years away in the constellation of Pegasus, orbiting the 6th magnitude Lambda Boötis star HR 8799. It has a mass between 5 and 10 Jupiter masses and a radius from 20 to 30% larger than Jupiter's. The planet orbits at 24 AU from HR 8799 with an eccentricity greater than 0.04 and a period of 100 years.".
- HR_8799_d label "HR 8799 d".
- HR_8799_d label "HR 8799 d".
- HR_8799_d label "HR 8799 d".
- HR_8799_d label "HR 8799 d".
- HR_8799_d label "HR 8799 d".
- HR_8799_d label "HR 8799 d".
- HR_8799_d label "HR 8799 d".
- HR_8799_d sameAs HR_8799_d.
- HR_8799_d sameAs HR_8799_d.
- HR_8799_d sameAs HR_8799_d.
- HR_8799_d sameAs HR_8799_d.
- HR_8799_d sameAs HR_8799_d.
- HR_8799_d sameAs HR_8799_d.
- HR_8799_d sameAs m.04vwdh6.
- HR_8799_d sameAs Q778639.
- HR_8799_d sameAs Q778639.
- HR_8799_d wasDerivedFrom HR_8799_d?oldid=640884579.
- HR_8799_d depiction Exoplanet_Comparison_HR_8799_d.png.
- HR_8799_d isPrimaryTopicOf HR_8799_d.