Voyager 1 alla velocità con cui si è allontanata nell'anno fino al 2026-10-25 (JPL Horizons). In auto: senza sosta, senza mai fare rifornimento.
Dati
Kepler-397 c ha una temperatura di equilibrio compresa tra −50 e +50 °C.
Come è stato scoperto
Primo pianeta scoperto nel 2014 con il transito (NASA Exoplanet Archive).
I suoi pianeti
Kepler-397 c — 6.2 times Earth's width, Neptune-sized; its year lasts 140 days; about 22 °C, between freezing and boiling; found in 2014 by transit.
Kepler-397 b — 2.5 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 22 days; about 270 °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.