Voyager 1 à la vitesse à laquelle elle s'est éloignée au cours de l'année jusqu'à 2026-10-25 (JPL Horizons). En voiture : sans arrêt, sans jamais refaire le plein.
Méthode de découverte
Première planète découverte en 2014, par transit (NASA Exoplanet Archive).
Ses planètes
Kepler-398 d — 0.9 times Earth's width, about Earth-sized — probably rocky; its year lasts 7 days; about 360 °C, hotter than boiling water; found in 2016 by transit.
Kepler-398 c — 1 times Earth's width, about Earth-sized — probably rocky; its year lasts 11 days; about 260 °C, hotter than boiling water; found in 2014 by transit.
Kepler-398 b — 0.9 times Earth's width, about Earth-sized — probably rocky; its year lasts 4 days; about 480 °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.