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 radial velocity (NASA Exoplanet Archive).
Its planets
HD 219134 c — 1.5 times Earth's width, about Earth-sized — probably rocky; its year lasts 7 days; about 510 °C, hotter than boiling water; found in 2015 by radial velocity.
HD 219134 d — 1.6 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 47 days; about 140 °C, hotter than boiling water; found in 2015 by radial velocity.
HD 219134 f — 1.3 times Earth's width, about Earth-sized — probably rocky; its year lasts 23 days; about 250 °C, hotter than boiling water; found in 2015 by radial velocity.
HD 219134 h — 13 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts about 6 Earth years; about −160 °C, below freezing; found in 2015 by radial velocity.
HD 219134 b — 1.6 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 3 days; about 740 °C, hotter than boiling water; found in 2015 by radial velocity.
HD 219134 g — 3.3 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 94 days; about 66 °C, between freezing and boiling; found in 2015 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.