Hottest Planet Reach 2,040 Degrees Celsius

University of Central Florida Physics Professor Joseph Harrington and his team have measured the hottest planet ever at 2,040 degrees Celsius (3,700 degrees Fahrenheit). HD 149026b is simply the most exotic, bizarre planet and its pretty small, really dense, and now found out it's extremely hot. There are more than 230 extrasolar planets, but this is only the fourth of these to have its temperature measured directly. It is simple to explain the temperatures of the other three planets. However, for HD 149026b to reach 2,040 degrees Celsius (3,700 degrees Fahrenheit), it must absorb essentially all the starlight that reaches it. This means the surface must be blacker than charcoal, which is unprecedented for planets. The planet would also have to re-radiate all that energy in the infrared.



This artist's concept illustrates the hottest planet yet observed in the universe. The scorching ball of gas, a "hot Jupiter" called HD 149026b, is a sweltering 3,700 degrees Fahrenheit (2,040 degrees Celsius) -- about 3 times hotter than the rocky surface of Venus, the hottest planet in our solar system. The planet is so hot that astronomers believe it is absorbing almost all of the heat from its star, and reflecting very little to no light. Objects that reflect no sunlight are black. Consequently, HD 149026b might be the blackest known planet in the universe, in addition to the hottest.

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