Voyager 1 mit der Geschwindigkeit, mit der sie sich im Jahr bis 2026-10-25 nach außen bewegte (JPL Horizons). Fahrt: ohne Pause, ohne je nachzutanken.
Wie er entdeckt wurde
Erster Planet, entdeckt 2023 durch Transit (NASA Exoplanet Archive).
Seine Planeten
Kepler-1991 b — 1.5 times Earth's width, about Earth-sized — probably rocky; its year lasts 13 days; about 490 °C, hotter than boiling water; found in 2023 by transit.
Kepler-1991 c — 2.6 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 23 days; about 360 °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.