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- Q272085 subject Q10650.
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- Q272085 subject Q7217167.
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- Q272085 abstract "HD 209458 b (sometimes unofficially called Osiris) is an exoplanet 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.".
- Q272085 thumbnail Exoplanet_Comparison_HD_209458_b.png?width=300.
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- Q272085 comment "HD 209458 b (sometimes unofficially called Osiris) is an exoplanet 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).".
- Q272085 label "HD 209458 b".
- Q272085 depiction Exoplanet_Comparison_HD_209458_b.png.