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Kepler-89
Kepler-89 is a star with four confirmed planets. Kepler-89 is a possible wide binary star.
==Planetary system==
The discovery of four planets orbiting the star was announced October 2012 by analyzing data gathered by Kepler space telescope. Follow-up radial velocity measurements confirmed the existence of Kepler-89d, indicating that Kepler-89d is slightly larger and more massive than Saturn. In October 2013, other three planets were confirmed with Kepler-89c and Kepler-89e getting reasonable mass constraints. Transit-timing variations of the outermost planet suggest that additional planets or minor bodies are present in the system.
In 2012, a partial transit of the second outermost planet by the outermost planet was reported. This was the first time a planet-planet transit in front of the star was detected.〔(【引用サイトリンク】title=First ever discovery of planet-planet eclipse | UTokyo Research )〕〔 This allowed to determine the mutual inclination of the planets d and e to be 1.15°.〔
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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