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Kepler-37
Kepler-37 is a G-type main-sequence star located in the constellation Lyra 215.2 light years from Earth. It is host to exoplanets Kepler-37b, Kepler-37c, Kepler-37d and Kepler-37e, all of which orbit very close to it. Kepler-37 has a mass about 80.3 percent of the Sun's and a radius about 77 percent as large. It has a temperature similar to that of the Sun, but a bit cooler at 5,417 K. It has about half the metallicity of our Sun. With an age of roughly 6 billion years,〔(Smallest Alien Planet Kepler-37b Explained (Infographic) )〕 it is slightly older than the Sun, but is still a main-sequence star. Until January 2015, Kepler-37 was the smallest star to be measured via asteroseismology.〔
==Planetary system==
Kepler-37b is the closest planet to the Kepler-37. At the time of its discovery in February 2013, it was the smallest known exoplanet. At in diameter, it is slightly larger than the Moon.〔 It orbits Kepler-37 once every 13 days at a distance of about 0.1 astronomical units (AU).〔 Kepler-37b has a rocky surface and is believed to be too small and too close to its star to support water or maintain an atmosphere.〔 Surface temperature is estimated at .〔
Kepler-37c is around three-quarters of the diameter of Earth and orbits approximately every 21 days at a distance of just under 0.14 AU. Kepler-37d is about twice the diameter of Earth. It orbits in around 40 days at a distance of nearly 0.21 AU.〔 Neither is able to support water due to their proximity to Kepler-37.〔
The periods of the three inner planets are close (within one per cent) to a 5:8:15 mean-motion resonance relationship.
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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