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The planetary equilibrium temperature is a theoretical temperature that a planet would be if it were in radiative equilibrium, typically under the assumption that it radiates as a black body being heated only by its parent star.
This is a list of the coolest exoplanets known, specifically those with temperatures lower than −75 °C (198 K). Planets from the Solar System were also included for comparison purposes. Discovered in 2006, OGLE-2005-BLG-390Lb is the coldest known exoplanet, and was nicknamed "Hoth" by NASA in reference to the planet from the Star Wars ...
This is a list of the hottest exoplanets so far discovered, specifically those with temperatures greater than 2,500 K (2,230 °C; 4,040 °F). For comparison, the hottest planet in the Solar System is Venus, with a temperature of 737 K (464 °C; 867 °F).
However, the planet is likely a mini-Neptune given its size. The planet has an ESI of 0.72, similar to that of Mars and Kepler-22b. [3] [4] The equilibrium temperature could range from a comfortable 317 K (44 °C; 111 °F) to a chilly 239 K (−34 °C; −29 °F), both within the thermal amplitude of the Earth. [2]
For a planet with an atmosphere, these temperatures can be different than the mean surface temperature, which may be measured as the global-mean surface air temperature, [20] or as the global-mean surface skin temperature. [21] A radiative equilibrium temperature is calculated for the case that the supply of energy from within the planet (for ...
Since the equilibrium temperature is the intersection of this curve and a horizontal line representing solar flux, for fluxes above this point the planet heats up indefinitely. [4] Kasting estimated the limit for Earth to be 320 watts per square meter. [5] The limit is relevant for estimating the inner edge of the circumstellar habitable zone ...
TRAPPIST-1f is an Earth-sized exoplanet, meaning it has a radius close to that of Earth. It has an equilibrium temperature of 218 K (−55 °C; −67 °F). [4] It has a radius of 1.045 R 🜨 and a mass of 1.039 M 🜨. [2]
Based on the orbits of the planets and the luminosity and effective temperature of the host star, the equilibrium temperatures of the planets can be calculated. Assuming an extremely high albedo of 0.9 and absence of greenhouse effect , the outer planet Kepler-42 d would have an equilibrium temperature of about 280 K (7 °C), [ 7 ] similar to ...