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- HD_209458_b abstract "HD 209458 b is an extrasolar planet that orbits the Solar analog star HD 209458 in the constellation Pegasus, some 150 light-years from Earth's solar system.The radius of the planet's orbit is 7 million kilometres, about 0.047 astronomical units, or one eighth the radius of Mercury's orbit. This small radius results in a year that is 3.5 Earth days long and an estimated surface temperature of about 1,000 °C (about 1,800 °F). Its mass is 220 times that of Earth (0.69 Jupiter masses) and its volume is some 2.5 times greater than that of Jupiter. The high mass and great volume of HD 209458 b indicate that it is a gas giant.HD 209458 b represents a number of milestones in extraplanetary research. It was the first of many categories: a transiting extrasolar planet discovered, the first planet detected through more than one method, an extrasolar planet known to have an atmosphere, an extrasolar planet observed to have an evaporating hydrogen atmosphere, an extrasolar planet found to have an atmosphere containing oxygen and carbon, one of the first two extrasolar planets to be directly observed spectroscopically and the first extrasolar gas giant to have its superstorm measured, and the first planet to have its orbital speed measured, determining its mass directly. Based on the application of new, theoretical models, as of April 2007, it is alleged to be the first extrasolar planet found to have water vapor in its atmosphere.".
- HD_209458_b thumbnail Exoplanet_Comparison_HD_209458_b.png?width=300.
- HD_209458_b wikiPageExternalLink text.
- HD_209458_b wikiPageExternalLink fall04.shtml.
- HD_209458_b wikiPageExternalLink planettour.asp?StarCatId=normal&PlanetId=106.
- HD_209458_b wikiPageExternalLink news.cfm?release=2005-050.
- HD_209458_b wikiPageExternalLink news050321-9.html.
- HD_209458_b wikiPageExternalLink article.ns?id=dn4634.
- HD_209458_b wikiPageExternalLink article.ns?id=dn7186.
- HD_209458_b wikiPageExternalLink heic0303.html.
- HD_209458_b wikiPageExternalLink heic0403.html.
- HD_209458_b wikiPageID "453959".
- HD_209458_b wikiPageRevisionID "602639265".
- HD_209458_b age "4".
- HD_209458_b apastron "0.046".
- HD_209458_b apastronGm "6.8".
- HD_209458_b appMag "7.65".
- HD_209458_b argPeri "83".
- HD_209458_b class "G0V".
- HD_209458_b constell Pegasus_(constellation).
- HD_209458_b density "370".
- HD_209458_b detectionMethods Transit_(astronomy).
- HD_209458_b discoverers David_Charbonneau.
- HD_209458_b discoverers Geoffrey_Marcy.
- HD_209458_b discoverers Gregory_W._Henry.
- HD_209458_b discoverers Michel_Mayor.
- HD_209458_b discoverers Steven_S._Vogt.
- HD_209458_b discoverers "Kerry O'Connor".
- HD_209458_b discoverers "R.P. Butler".
- HD_209458_b discoverers David_Latham.
- HD_209458_b discoverers Timothy_Brown_(astronomer).
- HD_209458_b discoveryDate "1999-11-05".
- HD_209458_b discoveryMethod Radial_velocity.
- HD_209458_b discoverySite Lowell_Observatory.
- HD_209458_b discoverySite Observatory_of_Geneva.
- HD_209458_b discoveryStatus "Published".
- HD_209458_b distLy "154".
- HD_209458_b distPc "47.1".
- HD_209458_b eccentricity "0.014".
- HD_209458_b gravity "18.46".
- HD_209458_b gravityEarth "1.88".
- HD_209458_b hasPhotoCollection HD_209458_b.
- HD_209458_b inclination "86.1".
- HD_209458_b mass "0.71".
- HD_209458_b mass "1.13".
- HD_209458_b metallicity "0".
- HD_209458_b periastron "0.044".
- HD_209458_b periastronGm "6.6".
- HD_209458_b period "3.52474541".
- HD_209458_b periodHour "84.5938898".
- HD_209458_b planet "b".
- HD_209458_b radius "1.14".
- HD_209458_b radius "1.35".
- HD_209458_b semiAmp "84.26".
- HD_209458_b semimajor "0.045".
- HD_209458_b semimajorGm "6.7".
- HD_209458_b star HD_209458.
- HD_209458_b star "HD+209458".
- HD_209458_b tPeri "2452854.825415".
- HD_209458_b tPeri "± 0.00000025".
- HD_209458_b temperature "1130".
- HD_209458_b temperature "6000".
- HD_209458_b subject Category:Exoplanets.
- HD_209458_b subject Category:Exoplanets_detected_by_radial_velocity.
- HD_209458_b subject Category:Exoplanets_discovered_in_1999.
- HD_209458_b subject Category:Gas_giants.
- HD_209458_b subject Category:Hot_Jupiters.
- HD_209458_b subject Category:Pegasus_(constellation).
- HD_209458_b subject Category:Transiting_exoplanets.
- HD_209458_b comment "HD 209458 b is an extrasolar planet that orbits the Solar analog star HD 209458 in the constellation Pegasus, some 150 light-years from Earth's solar system.The radius of the planet's orbit is 7 million kilometres, about 0.047 astronomical units, or one eighth the radius of Mercury's orbit. This small radius results in a year that is 3.5 Earth days long and an estimated surface temperature of about 1,000 °C (about 1,800 °F).".
- HD_209458_b label "HD 209458 b".
- HD_209458_b label "HD 209458 b".
- HD_209458_b label "HD 209458 b".
- HD_209458_b label "HD 209458 b".
- HD_209458_b label "HD 209458 b".
- HD_209458_b label "HD 209458 b".
- HD_209458_b label "HD 209458 b".
- HD_209458_b label "HD 209458 b".
- HD_209458_b label "HD 209458b".
- HD_209458_b label "Osiris (exoplaneet)".
- HD_209458_b label "إتش دي 209458 بي".
- HD_209458_b label "オシリス (惑星)".
- HD_209458_b sameAs HD_209458_b.
- HD_209458_b sameAs HD_209458_b.
- HD_209458_b sameAs Όσιρις_(πλανήτης).
- HD_209458_b sameAs HD_209458_b.
- HD_209458_b sameAs HD_209458_b.
- HD_209458_b sameAs HD_209458_b.
- HD_209458_b sameAs HD_209458_b.
- HD_209458_b sameAs オシリス_(惑星).
- HD_209458_b sameAs HD_209458_b.
- HD_209458_b sameAs Osiris_(exoplaneet).
- HD_209458_b sameAs HD_209458_b.
- HD_209458_b sameAs HD_209458_b.
- HD_209458_b sameAs m.02bfd3.
- HD_209458_b sameAs Q272085.
- HD_209458_b sameAs Q272085.
- HD_209458_b wasDerivedFrom HD_209458_b?oldid=602639265.
- HD_209458_b depiction Exoplanet_Comparison_HD_209458_b.png.
- HD_209458_b isPrimaryTopicOf HD_209458_b.