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Kepler-11e
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Kepler-11e is an exoplanet (extrasolar planet) discovered in the orbit of the sunlike star Kepler-11. It is the fourth of six planets around Kepler-11 discovered by NASA's Kepler spacecraft. Kepler-11e was found by using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured. Kepler-11e is most likely a gas giant like Neptune, having a density that is less than that of Saturn, the least dense planet in the Solar System.〔 Its low density can probably be attributed to a large hydrogen and helium atmosphere.〔 Kepler-11e has a mass eight times of Earth's mass and a radius 4.5 times that of Earth. The planet orbits its star every 31 days in an ellipse that would fit within the orbit of Mercury. Kepler-11e was announced on February 2, 2011 with its five sister planets after it was confirmed by several observatories.
==Name and discovery==
At the time when Kepler-11 was first noted as a host to a potential transit event, the star was given the designation KOI-157.〔 It was later assigned the name "Kepler-11" after the Kepler spacecraft, a NASA satellite tasked with discovering planets in transit of, or crossing in front of, their stars. This transit causes a slight and regular change in the host star's brightness, which can then tested to prove the planet's existence and, later, to extrapolate the orbital parameters of the planet.〔 Kepler-11e is first given the designation by its host star, Kepler-11. Since Kepler-11e was announced with five other planets, the letters added to the star are sorted by the planet's distance from its star. Kepler-11e is the fourth planet from Kepler-11, it is given the designation "e".
Follow-up confirmation observations were made by the Keck 1 telescope at the W.M. Keck Observatory in Hawaii, the Hale and Shane telescopes in California, the Harlan J. Smith and Hobby-Eberly telescopes in west Texas, the Nordic Optical Telescope in the Canary Islands, and by telescopes at the WIYN (including MMT) and Whipple observatories in Arizona. The Spitzer Space Telescope was also used. Kepler-11's planetary system became the first discovered extrasolar system with more than three transiting planets, as well as the most compact and flattest system yet discovered, according to NASA.〔 The planets of Kepler-11, including Kepler-11e, were announced jointly at a press conference on February 2, 2011. The findings were published in the journal ''Nature'' on February 3.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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