NASA: Hubble Finds Super Hot Planet With Comet-Like Tail

By Helena Zhu
Helena Zhu
Helena Zhu
July 16, 2010Updated: October 1, 2015

An illustration showing a view of the gas giant planet HD 209458b, as seen from the surface of a hypothetical nearby companion object. The planet is orbiting so close to its sunlike star that its heated atmosphere is escaping into space.  (Courtesy of ESA, G. Bacon/NASA.gov)
An illustration showing a view of the gas giant planet HD 209458b, as seen from the surface of a hypothetical nearby companion object. The planet is orbiting so close to its sunlike star that its heated atmosphere is escaping into space. (Courtesy of ESA, G. Bacon/NASA.gov)
Using NASA’s Hubble Space Telescope, astronomers found a scorched gas giant planet that could be called a cometary planet, according to a NASA press release.

The planet, known as HD 209458b, got its tail because it orbits so closely to its star. Its heated atmosphere is then casting off into space. The astronomers suggested that powerful stellar winds are sweeping the escaping atmospheric material behind the planet and shaping it into a comet-like tail.

The planet is located 153 light years away from Earth. Although it weighs less than Jupiter, it orbits 100 times closer to its star than Jupiter does. The super hot planet orbits around its star in merely three and a half days, much shorter than the orbiting period of the fastest planet in our solar system—88 days.