LHS 1140 b

LHS 1140 b
	Artist's impression of the planet LHS 1140 b and its host star
Discovery
Discovered by	MEarth Project
Discovery date	20 April 2017 (Published)
Detection method	Transit
Orbital characteristics
Semi-major axis	0.0946±0.0017 AU
Eccentricity	<0.043
Orbital period (sidereal)	24.7369148±0.0000058 d
Inclination	89.86°±0.04°
Star	LHS 1140
Physical characteristics
Mean radius	1.730±0.025 R🜨
Mass	5.60±0.19 M🜨
Mean density	5.9±0.3 g/cm3
Temperature	226±4 K (−47 °C; −53 °F, equilibrium)

LHS 1140 b is an exoplanet orbiting within the conservative habitable zone of the red dwarf LHS 1140. Discovered in 2017 by the MEarth Project,^[1] LHS 1140 b is about 5.6 times the mass of Earth and about 70% larger in radius, putting it within the super-Earth category of planets. It was initially thought to be a dense rocky planet, but refined measurements of its mass and radius have found a lower density, indicating that it is likely an ocean world with 9-19% of its mass composed of water. LHS 1140 b orbits entirely within the star's habitable zone and gets 43% the incident flux of Earth.^[2] The planet is 49 light-years away and transits its star, making it an excellent candidate for atmospheric studies with ground-based and/or space telescopes.^[1]

^ ^a ^b ^c Cite error: The named reference Dittmann2017 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Cadieux2023 was invoked but never defined (see the help page).
^ Cite error: The named reference Edwards2020 was invoked but never defined (see the help page).

[Dittmann2017-1] Cite error: The named reference Dittmann2017 was invoked but never defined (see the help page).

[Cadieux2023-2] Cite error: The named reference Cadieux2023 was invoked but never defined (see the help page).

[Edwards2020-3] Cite error: The named reference Edwards2020 was invoked but never defined (see the help page).

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