Star with 2 known planets
GJ 143
GJ 143, a K4.5 star, has 2 confirmed planets.
Measured
- Distance
- about 53.2 light-years
- Star's spectral type
- K4.5
- Confirmed planets
- 2
How far, from the Sun
About 53.2 light-years. To cross it:
- Light53.2 years
- Voyager 1's speed945,000 years
- Driving at 100 km/h574 million 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 2019, by transit (NASA Exoplanet Archive).
Its planets
- HD 21749 c — 0.9 times Earth's width, about Earth-sized — probably rocky; its year lasts 8 days; about 430 °C, hotter than boiling water; found in 2019 by transit.
- GJ 143 b — 2.6 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 36 days; about 150 °C, hotter than boiling water; found in 2019 by transit.
The NASA Exoplanet Archive's page
Where this comes from
- 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.
Every catalogue Ouranos draws is credited on the credits page.