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TRAPPIST-1g, also known as 2MASS J23062928-0502285 g and K2-112 g, is an exoplanet orbiting around the ultra-cool dwarf star TRAPPIST-1. TRAPPIST-1 is 39 light years away from Earth in the constellation Aquarius. The planet was one of four new exoplanets discovered orbiting the star using observations from the Spitzer Space Telescope.[1] The exoplanet is within the habitable zone of its host star.[2] It was found by using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured.

TRAPPIST-1g artist impression 2018.png
Artist's impression of TRAPPIST-1g. (February 2018)
Discovery date2017
Orbital characteristics
Eccentricity0.00208 (± 0.00058)
Inclination89.721 (± 0.23)
Physical characteristics
Mean diameter
14,398 km
Mean radius
5,797.6 km
Temperature−78.65 ± 2.70 °C

TRAPPIST-1g is the second most distant known planet in its system. It is larger than Earth but less dense. This means that it likely has some form of water.

References[change | change source]

  1. Cowing, Keith (2017-02-22). "Temperate Earth-Sized Planets Found in Extraordinarily Rich Planetary System TRAPPIST-1". SpaceRef. Retrieved 2022-11-15.
  2. NASA. "NASA telescope reveals largest batch of Earth-size, habitable-zone planets around single star". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 2022-11-15.