Kepler-289 e — 2.9 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 330 days; about 13 °C, between freezing and boiling; found in 2025 by transit.
Kepler-289 b — 2.5 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 35 days; about 330 °C, hotter than boiling water; found in 2014 by transit.
Kepler-289 d — 3 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 66 days; about 230 °C, hotter than boiling water; found in 2014 by transit.
Kepler-289 c — 11 times Earth's width, a giant, Jupiter-sized or more; its year lasts 130 days; about 120 °C, hotter than boiling water; found in 2014 by transit.
NASA Exoplanet Archive, Planetary Systems Composite Parameters (fetched 2026-11-02). Composite values: where a planet's size or mass was not measured, the archive estimates it from the other.
This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.