description LHS 1140 c Overview
LHS 1140 c is a transiting planet with a radius about 1.3 times Earth's and an orbital period of roughly 3.8 days. It orbits the nearby M dwarf LHS 1140 and is the inner member of a system that also includes LHS 1140 b, a larger planet on a much wider orbit. Because c is close to its star, it receives intense irradiation and is not the system's habitable-zone planet.
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How was LHS 1140 c discovered?
LHS 1140 c was first identified from a transit signal and later studied with radial-velocity data. Its discovery entry is dated 2018, following the earlier discovery of the outer planet LHS 1140 b in 2017. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/LHS%201140%20c)
How long is the orbit of LHS 1140 c?
LHS 1140 c completes an orbit in about 3.78 days at roughly 0.027 astronomical units from its M dwarf star. It is the inner planet in the known LHS 1140 system. [NASA Science](https://science.nasa.gov/exoplanet-catalog/lhs-1140-c/)
How large and massive is LHS 1140 c?
Its radius is about 1.27 Earth radii, and current solutions put its mass near 1.8 to 1.9 Earth masses. That combination is why it is commonly described as a super-Earth or terrestrial-sized planet. [NASA Science](https://science.nasa.gov/exoplanet-catalog/lhs-1140-c/)
How is LHS 1140 c different from LHS 1140 b?
LHS 1140 c is the hot inner planet with a 3.78-day orbit, while LHS 1140 b is farther out with a period of about 24.74 days. The outer b planet is the system member more often discussed in connection with temperate conditions and atmospheric studies. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/LHS%201140%20c)
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