Kepler-31
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Kepler-31 is a star in the northern constellation of Cygnus, the swan. It is orbited by three known exoplanets. It is located at the celestial coordinates: Right Ascension 19h 36m 05.5270s, Declination +45° 51′ 11.108″. With an apparent visual magnitude of 14.0, this star is too faint to be seen with the naked eye.
Planetary system
The three gas giant planets orbiting Kepler-31 were discovered in early 2011, albeit with large false alarm probability, and were confirmed in 2012. The planets form a resonant chain, with orbital periods ratio 1:2:4, although 20% probability exists that these period ratios may be coincidental.
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| .04(unconfirmed) | — | 0.0937 | 9.61730282±3.35e-5 | — | — | 0.173 RJ |
| b | <6.8 MJ | 0.16 | 20.8613 | — | — | 0.38±0.07 RJ |
| c | <4.7 MJ | 0.26 | 42.6318 | — | — | 0.38±0.07 RJ |
| d | — | 0.39 | 87.648901±0.000801 | — | — | 0.407±0.099 RJ |