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HIP 116454 b : ウィキペディア英語版 | HIP 116454 b
HIP 116454 b, or K2-2 b,〔 is an exoplanet orbiting the star HIP 116454, from Earth toward the constellation Pisces. It is in diameter and 12 times as massive as Earth.〔〔 It was discovered by the NASA ''Kepler'' spacecraft, and is the first exoplanet discovered during ''Kepler'' K2 mission.〔 The discovery was announced on December 18, 2014. does not have a normal ''Kepler'' designation due to not being located in the original ''Kepler'' field.〔 was discovered in a ''Kepler'' engineering data set which was collected in preparation of the first full K2 campaign. Unlike most other ''Kepler'' planets, only a single transit event of was detected, requiring follow-up radial velocity measurements by the HARPS-N spectrograph and photometric measurements by the Canadian MOST satellite.〔〔 Physical characteristics of are expected to be similar to Kepler-68b, being somewhere between super-Earth and mini-Neptune.〔 ==References==
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