Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.
How it was found
First planet found in 2015, by eclipse timing variations (NASA Exoplanet Archive).
Its planets
Kepler-451 c — 14 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts about 4 Earth years; found in 2022 by eclipse timing variations.
2MASS J19383260+4603591 b — 13 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 410 days; about 400 °C, hotter than boiling water; found in 2015 by eclipse timing variations.
Kepler-451 d — 14 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 43 days; found in 2022 by eclipse timing variations.
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.