Star system, 49 light-years
LHS 1140 and its two planets
LHS 1140 b is an exoplanet 1.73 times Earth's width, 49 light-years away, orbiting in its star's computed habitable zone.
LHS 1140 is a star of spectral type M4.5 V, 49 light-years from us, with two known planets. This page takes them one at a time.
Drawn at the system's own scale, every orbit from the Archive's numbers.
What is measured, what is computed, what is imagined.
measured The period, and where the table says so the width and the mass, by the method named in each section.
computed Anything marked computed: the size of an orbit where Kepler's third law corrects the table, the temperature of a bare ball at that distance, the starlight received, and the habitable zone.
imagined The picture is an artist's impression. Nobody has seen the surface of a planet of another star: its colour, clouds and land are not known, and the share picture says so in its corner.
The planets
LHS 1140 c
LHS 1140 c is an exoplanet 1.272 times Earth's width, 49 light-years away, orbiting closer to its star than the habitable zone we compute for it.
- Width
- 1.272 × Earth's measured
- Mass
- 1.91 times Earth's measured
- One year
- 3.77794 days measured
- Distance from its star
- 0.027 au from the Archive
- Temperature of a bare ball there
- 385 K computed, not measured
- Starlight, against Earth's
- 5.21 × computed
It was found as a small, regular dip in its star's light each time it crosses in front of it in 2018. Its orbit is closer to its star than the habitable zone computed for it.
See LHS 1140 c in 3D · The picture is an artist's impression.
LHS 1140 b
LHS 1140 b is an exoplanet 1.73 times Earth's width, 49 light-years away, orbiting in its star's computed habitable zone.
- Width
- 1.73 × Earth's measured
- Mass
- 5.6 times Earth's measured
- One year
- 24.7372 days measured
- Distance from its star
- 0.0946 au from the Archive
- Temperature of a bare ball there
- 206 K computed, not measured
- Starlight, against Earth's
- 0.425 × computed
It was found as a small, regular dip in its star's light each time it crosses in front of it in 2017. Its orbit lies inside the conservative habitable zone computed for its star (liquid water on a rocky world's surface would be possible there, which says nothing about whether any is).
See LHS 1140 b in 3D · The picture is an artist's impression.
The star
- Surface temperature
- 3,096 K
- Width
- 0.216 × the Sun's
- Mass
- 0.1844 × the Sun's
- Spectral type
- M4.5 V
- Distance
- 49 light-years
- Habitable zone, computed
- 0.06414 to 0.127 au from the star