| Proper Name | None | | Designations | Kepler-31 d, KOI-935 d, KOI-935.03, KIC 9347899 d, KIC 9347899.03 | | Classification | Earth-mass planet | | Orbital Period | 87 days, 16 hours | | Mean Distance from Kepler-31 | 61.5 million km
0.41 AU | | Mass | Not known | | Diameter | 0.42 x Jupiter | | Temperature | Not known | | Parent star | Kepler-31, probable yellow dwarf in Cygnus | | Other planets in this system | Kepler-31 b, Earth-mass planet
Kepler-31 c, Earth-mass planet
KOI-935.04, unconfirmed exoplanet | | Notes | The F-type star Kepler-31 is known to have at least three planets in orbit, and possibly more, with all the known planets following very close orbits around the star. Kepler-31 d is the outermost of the three, and has an orbit comparable with that of Mercury around the Sun, while its companions Kepler-31 b and Kepler-31 c lie even closer to their parent star. |
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