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- HD_209458_b abstract "HD 209458 b (sometimes though unofficially named Osiris) is an extrasolar planet that orbits the solar analog HD 209458 in the constellation Pegasus, some 150 light-years from the 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 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 the first extrasolar gas giant to have its superstorm measured 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.In July, 2014, NASA announced finding very dry atmospheres on three exoplanets (HD 189733b, HD 209458b, WASP-12b) orbiting Sun-like stars.".
- HD_209458_b thumbnail Exoplanet_Comparison_HD_209458_b.png?width=300.
- HD_209458_b wikiPageExternalLink text.
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- HD_209458_b wikiPageID "453959".
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- HD_209458_b wikiPageRevisionID "675625125".
- HD_209458_b wikiPageWikiLink 51_Pegasi_b.
- HD_209458_b wikiPageWikiLink Albedo.
- HD_209458_b wikiPageWikiLink Astronomical_spectroscopy.
- HD_209458_b wikiPageWikiLink Astronomical_transit.
- HD_209458_b wikiPageWikiLink Astronomical_unit.
- HD_209458_b wikiPageWikiLink Astrophysical_Journal.
- HD_209458_b wikiPageWikiLink Atmosphere.
- HD_209458_b wikiPageWikiLink Carbon.
- HD_209458_b wikiPageWikiLink Carbon_dioxide.
- HD_209458_b wikiPageWikiLink Category:Exoplanets.
- HD_209458_b wikiPageWikiLink Category:Exoplanets_detected_by_radial_velocity.
- HD_209458_b wikiPageWikiLink Category:Exoplanets_discovered_in_1999.
- HD_209458_b wikiPageWikiLink Category:Giant_planets.
- HD_209458_b wikiPageWikiLink Category:Hot_Jupiters.
- HD_209458_b wikiPageWikiLink Category:Pegasus_(constellation).
- HD_209458_b wikiPageWikiLink Category:Transiting_exoplanets.
- HD_209458_b wikiPageWikiLink DR._Kerry_OConnor_P.H.D.
- HD_209458_b wikiPageWikiLink David_Charbonneau.
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- HD_209458_b wikiPageWikiLink Drag_(physics).
- HD_209458_b wikiPageWikiLink ESA.
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- HD_209458_b wikiPageWikiLink Escape_velocity.
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- HD_209458_b wikiPageWikiLink Fluid_dynamics.
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- HD_209458_b wikiPageWikiLink NASA.
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- HD_209458_b wikiPageWikiLink Oxygen.
- HD_209458_b wikiPageWikiLink Pegasus_(constellation).
- HD_209458_b wikiPageWikiLink Photometry_(astronomy).
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- HD_209458_b wikiPageWikiLink Rossiter-McLaughlin_effect.
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- HD_209458_b wikiPageWikiLink Sara_Seager.
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- HD_209458_b wikiPageWikiLink Spectroscopy.
- HD_209458_b wikiPageWikiLink Spitzer_Space_Telescope.
- HD_209458_b wikiPageWikiLink Steven_S._Vogt.
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- HD_209458_b wikiPageWikiLink Theoretical.
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- HD_209458_b wikiPageWikiLink Tidal_heating.
- HD_209458_b wikiPageWikiLink Timothy_Brown_(astronomer).
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