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 2026, by radial velocity and transit (NASA Exoplanet Archive).
Its planets
TOI-5789 d — 1.9 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 30 days; about 270 °C, hotter than boiling water; found in 2026 by radial velocity.
TOI-5789 b — 1.3 times Earth's width (estimated from its mass, not measured), about Earth-sized — probably rocky; its year lasts 3 days; about 930 °C, hotter than boiling water; found in 2026 by radial velocity.
TOI-5789 c — 2.9 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 13 days; about 450 °C, hotter than boiling water; found in 2026 by transit.
TOI-5789 e — 3.4 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 63 days; about 150 °C, hotter than boiling water; found in 2026 by radial velocity.
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.