Knowra Kepler-442b Kepler-442b Kepler-442b is a super-Earth exoplanet orbiting the K-type star Kepler-442 about 1,200 light-years away in Lyra. Its size and orbit place it among planets studied for potential habitability.
Exoplanet : A planet orbiting a star other than the Sun. Kepler-442b belongs to this broader class of worlds.
Circumstellar habitable zone : The range of distances from a star where a planet could sustain liquid water on its surface under suitable atmospheric conditions. Kepler-442b orbits within estimates of its star’s habitable zone.
Kepler-442 : A K-type main-sequence star in Lyra, about 1,200 light-years from Earth, orbited by Kepler-442b. Its brightness, spectrum, and evolution shape the planet’s received energy.
Exoplanet mass-radius relationship : The empirical relation connecting an exoplanet’s measured radius to its mass and likely bulk composition. Kepler-442b’s radius alone cannot reveal whether it is rocky or volatile-rich.
Super-Earth : An exoplanet more massive than Earth but lighter than ice giants such as Neptune; definitions vary. Its estimated size places it in this category, without establishing that it resembles Earth.
Planetary equilibrium temperature : An estimate of a planet’s temperature from absorbed and emitted energy, usually excluding atmospheric effects. It helps frame possible climate conditions but cannot establish the planet’s surface temperature.
Kepler-452b : A confirmed exoplanet orbiting a Sun-like star, whose size and orbit prompted comparisons with Earth. It is another Kepler-discovered candidate for an Earth-like environment, but orbits a different type of star.
Exoplanet atmospheric characterization : The study of an exoplanet’s atmospheric composition and structure, often using starlight filtered through or emitted by the atmosphere. Atmospheric measurements could test whether the planet has conditions compatible with surface liquid water.
Transit method : A method for detecting exoplanets by measuring periodic dips in a star’s brightness as a planet crosses its disk. Kepler-442b was identified from the recurring dimming of its host star.
Planetary atmosphere : The layer of gases surrounding a planet, shaping its climate and interaction with space. An atmosphere could determine whether surface water is possible on Kepler-442b.
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