À propos 1,280 années-lumière. Pour la traverser :
Lumière1,280 ans
Vitesse de Voyager 122.7 millions d’années
Roule à 100 km/h13.8 milliards d'années
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 variations du temps de transit, transit et vitesse radiale (NASA Exoplanet Archive).
Ses planètes
Kepler-139 f — 6.7 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 360 days; found in 2025 by transit timing variations.
Kepler-139 c — 3.4 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 160 days; about 77 °C, between freezing and boiling; found in 2014 by transit.
Kepler-139 e — 14 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts about 6 Earth years; about −120 °C, below freezing; found in 2023 by radial velocity.
Kepler-139 b — 2.9 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 16 days; about 480 °C, hotter than boiling water; found in 2014 by transit.
Kepler-139 d — 1.7 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 7 days; about 700 °C, hotter than boiling water; found in 2023 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.