BD+20 2457, a K2 II star, has 2 confirmed planets.
Measured
Distance
about 5,022 light-years
Star's spectral type
K2 II
Confirmed planets
2
How far, from the Sun
About 5,020 light-years. To cross it:
Light5,020 years
Voyager 1's speed89.2 million years
Driving at 100 km/h54.2 billion years
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 2009, by radial velocity (NASA Exoplanet Archive).
Its planets
BD+20 2457 c — 12 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 620 days; about 710 °C, hotter than boiling water; found in 2009 by radial velocity.
BD+20 2457 b — 12 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 380 days; about 890 °C, hotter than boiling water; found in 2009 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.