Height, depth and spaceTemperature
Hottest planet known (outside the Solar System)
3,777 °C
6,831 °F
- Record holder
- KELT-9b
What to remember
KELT-9b is the hottest known planet outside the Solar System: its temperature reaches 4,050 K, give or take 180 K, or 3,777 °C. This ultra-hot Jupiter follows a polar orbit around the star KELT-9, also designated HD 195689, about 670 light-years from Earth.
It was detected with the Kilodegree Extremely Little Telescope, which gave it its name. By June 2017 it was already the hottest known exoplanet. It is an irradiated planet: its heat comes from its star.
The title is still debated. Two candidate planets, among them OGLE-TR-1001b, would be hotter, at 4,200 K and 6,285 K, and another candidate, said to orbit WD 2226-210, the central star of the Helix Nebula, would have an equilibrium temperature of 4,970 K. Kepler-70b and Kepler-70c are often described as the hottest known exoplanets, at more than 6,800 K, but their existence is highly doubtful. None of these planets is confirmed.
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Sources and licences
- Value, holder and date: Wikipedia article “List of exoplanet extremes” (revision used 1381113026). Data from Wikipedia, licensed under CC BY-SA 4.0.
- Photo: NASA, Photo licensed under Public domain (Wikimedia Commons).
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