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Kepler-33
Kepler-33 is a star in the constellation of Cygnus with a system of five known planets. Having begun to evolve from the main sequence,〔 it has roughly 161.5% of the Sun's radius but only 116.4% of the Sun's mass. Given its mass and temperature, it is likely an early G-type star. The star's distance is not known.
== Planetary system ==
On January 26, 2012, a system of five planets around the star was announced.〔 However, unlike other planets confirmed via Kepler, their masses are not known, as Doppler Spectroscopy measurements were not done before the announcement. Judging by their radii, b may be a large Super-Earth or small Hot Neptune while the other four are all likely to be the latter.
Planets b and c may actually be in a 7:3 resonance, as there is a 0.05 day discrepancy; there is also a small 0.18 day discrepancy between a 5:3 resonance between planets c and d. The other planets do not seem to be in any resonances, though near resonances are 3d:2e and 4e:3f.
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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