Kepler-84
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Kepler-84 is a Sun-like star 3,339 light-years from the Sun. It is a G-type star. The stellar radius measurement has a large uncertainty of 48% as in 2017, complicating the modelling of the star. The Kepler-84 star has two suspected stellar companions. Four stars, all more than four magnitudes fainter than Kepler-84, are seen within a few arcseconds and at least one is probably gravitationally bound to Kepler-84. Another, which has only a 0.005% chance of being a background star, is a yellow star with mass 0.855 M☉ at a projected separation of 0.18±0.05″ or 0.26″ (213.6 AU).
Planetary system
Kepler-84 is orbited by five known planets, four small gas giants and a Super-Earth. Planets Kepler-84b and Kepler-84c were confirmed in 2012 while the rest was confirmed in 2014. To keep the known planetary system stable, no additional giant planets can be located within 7.4 AU from the parent stars.
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.126±0.038 MJ | 0.083 | 8.725854±0.00006 | 0 | 88.24° | 0.174±0.045 RJ |
| c | 0.064±0.037 MJ | 0.108 | 12.882525±0.000093 | 0 | 88.24° | 0.184±0.047 RJ |
| d | — | 0.052 | 4.224537±0.000042 | — | — | 0.123±0.024 RJ |
| e | — | 0.181 | 27.434389±0.000224 | — | — | 0.232±0.044 RJ |
| f | — | 0.25 | 44.552169±0.000812 | — | — | 0.196±0.038 RJ |