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 2008, by imaging (NASA Exoplanet Archive).
Its planets
HR 8799 d — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 100 Earth years; about 1,000 °C, hot enough to melt rock; found in 2008 by imaging.
HR 8799 b — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 470 Earth years; about 930 °C, hotter than boiling water; found in 2008 by imaging.
HR 8799 e — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 57 Earth years; about 880 °C, hotter than boiling water; found in 2010 by imaging.
HR 8799 c — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 190 Earth years; about 930 °C, hotter than boiling water; found in 2008 by imaging.
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.