Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.
Facts
GJ 3293 b, GJ 3293 d have an equilibrium temperature between −50 and +50 °C.
How it was found
First planet found in 2015, by radial velocity (NASA Exoplanet Archive).
Its planets
GJ 3293 b — 5.2 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 31 days; about 8 °C, between freezing and boiling; found in 2015 by radial velocity.
GJ 3293 d — 2.7 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 48 days; about −32 °C, below freezing; found in 2017 by radial velocity.
GJ 3293 c — 4.9 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 120 days; about −96 °C, below freezing; found in 2015 by radial velocity.
GJ 3293 e — 1.6 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 13 days; about 98 °C, between freezing and boiling; found in 2017 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.