Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.
Facts
HD 10180 g has an equilibrium temperature between −50 and +50 °C.
How it was found
First planet found in 2010, by radial velocity (NASA Exoplanet Archive).
Its planets
HD 10180 h — 9.4 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts about 6 Earth years; about −110 °C, below freezing; found in 2010 by radial velocity.
HD 10180 d — about 3,300 times Earth's mass; its year lasts 16 days; about 560 °C, hotter than boiling water; found in 2010 by radial velocity.
HD 10180 f — 5.2 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 120 days; about 160 °C, hotter than boiling water; found in 2010 by radial velocity.
HD 10180 e — 5.4 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 50 days; about 310 °C, hotter than boiling water; found in 2010 by radial velocity.
HD 10180 g — about 3,400 times Earth's mass; its year lasts 600 days; about −22 °C, below freezing; found in 2010 by radial velocity.
HD 10180 c — about 2,700 times Earth's mass; its year lasts 6 days; about 910 °C, hotter than boiling water; found in 2010 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.