description Kepler-22 Overview
Kepler-22 is a G-type main-sequence star located approximately 620 light-years away in the constellation Cygnus. It is notable for hosting Kepler-22b, an exoplanet announced in 2011 as the first confirmed planet discovered by the Kepler space telescope to orbit within the habitable zone of a Sun-like star. The star is slightly smaller and cooler than the Sun, meaning its habitable zone is closer to the star than the Solar System's. Kepler-22b has a radius roughly 2.4 times that of Earth, though its exact composition remains unknown.
help Kepler-22 FAQ
Is Kepler-22 the star or the planet?
Kepler-22 is the host star, while Kepler-22 b is the planet detected orbiting it. Both lie in the direction of the constellation Cygnus.
Why was the discovery of Kepler-22 b important?
NASA announced Kepler-22 b in 2011 as the Kepler mission's first confirmed planet in the habitable zone of a Sun-like star. "Habitable zone" only describes the range where liquid water might be possible under suitable conditions, not proof that the planet is inhabited.
How similar is Kepler-22 to the Sun?
Kepler-22 is a G-type main-sequence star, placing it in the same broad stellar class as the Sun. It is somewhat cooler and less luminous, so its habitable zone is positioned differently.
Do astronomers know whether Kepler-22 b is rocky?
No firm surface composition has been established because the planet's mass and density are not precisely constrained. Its measured radius is substantially larger than Earth's, leaving possibilities that include a volatile-rich world rather than a true Earth analogue.
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