Hubble Space telescope has discovered a planet which has a tail like a comet! HD 209458b planet is about 153 light years and was found in the year 2003.
Scientists have measured the gas coming out from the planet.
Scientists have used Hubble to find about the atmosphere of the planet as it crossed infront of its star.
HD 209458 b is an extrasolar planet (unofficially referred to as "Osiris") that orbits theSolar analog star HD 209458 in the constellation Pegasus, some 150 light-years from Earth's solar system, with evidence of water vapor. 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, 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, and one of the first two extrasolar planets to be directly observed spectroscopically. 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.
On 23 June 2010, astronomers announced they have measured a superstorm (with windspeeds of up to 7000 km/h) for the first time in the atmosphere of HD 209458 b. The very high-precision observations done by ESO’s Very Large Telescope and its powerful CRIRES spectrograph of carbon monoxide gas show that it is streaming at enormous speed from the extremely hot day side to the cooler night side of the planet. The observations also allow another exciting “first”—measuring the orbital speed of the exoplanet itself, providing a direct determination of its mass.
HD 209458 is an 8th magnitude star, visible from Earth with binoculars.
Scientists have measured the gas coming out from the planet.Scientists have used Hubble to find about the atmosphere of the planet as it crossed infront of its star.
HD 209458 b is an extrasolar planet (unofficially referred to as "Osiris") that orbits theSolar analog star HD 209458 in the constellation Pegasus, some 150 light-years from Earth's solar system, with evidence of water vapor. 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, 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, and one of the first two extrasolar planets to be directly observed spectroscopically. 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.
On 23 June 2010, astronomers announced they have measured a superstorm (with windspeeds of up to 7000 km/h) for the first time in the atmosphere of HD 209458 b. The very high-precision observations done by ESO’s Very Large Telescope and its powerful CRIRES spectrograph of carbon monoxide gas show that it is streaming at enormous speed from the extremely hot day side to the cooler night side of the planet. The observations also allow another exciting “first”—measuring the orbital speed of the exoplanet itself, providing a direct determination of its mass.
HD 209458 is an 8th magnitude star, visible from Earth with binoculars.
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