Star with a known planet
4 UMa
4 UMa, a K1 III star, has one confirmed planet.
Measured
- Distance
- about 240 light-years
- Star's spectral type
- K1 III
- Confirmed planets
- 1
How far, from the Sun
About 240 light-years. To cross it:
- Light240 years
- Voyager 1's speed4.26 million years
- Driving at 100 km/h2.59 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 2006, by radial velocity (NASA Exoplanet Archive).
Its planets
- 4 UMa b — 13 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 270 days; about 690 °C, hotter than boiling water; found in 2006 by radial velocity.
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.