LHS 1140, an M4.5 V star, has 2 confirmed planets.
Measured
Distance
about 48.9 light-years
Star's spectral type
M4.5 V
Confirmed planets
2
How far, from the Sun
About 48.9 light-years. To cross it:
Light48.9 years
Voyager 1's speed869,000 years
Driving at 100 km/h528 million years
Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.
Facts
LHS 1140 b has an equilibrium temperature between −50 and +50 °C.
How it was found
First planet found in 2017, by transit (NASA Exoplanet Archive).
Its planets
LHS 1140 b — 1.7 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 25 days; about −47 °C, below freezing; found in 2017 by transit.
LHS 1140 c — 1.3 times Earth's width, about Earth-sized — probably rocky; its year lasts 4 days; about 150 °C, hotter than boiling water; found in 2018 by transit.
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.