HD 154391, a K1 III star, has one confirmed planet.
Measured
Distance
about 329 light-years
Star's spectral type
K1 III
Confirmed planets
1
How far, from the Sun
About 329 light-years. To cross it:
Light329 years
Voyager 1's speed5.85 million years
Driving at 100 km/h3.55 billion years
Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.
Facts
HD 154391 b has an equilibrium temperature between −50 and +50 °C.
How it was found
First planet found in 2023, by radial velocity (NASA Exoplanet Archive).
Its planets
HD 154391 b — 13 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts about 14 Earth years; about −19 °C, below freezing; found in 2023 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.