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Offline syhprum

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How hot is Kepler B
« on: 06/12/2011 07:24:30 »
The newly identified planet Kepler B orbiting a M type star in 290 days placing it well within the "Goldilocks zone" is reputed to have a surface temperature of 22°C.
If this is a black body figure it may be too hot depending on the atmosphere bearing in mind that the black body temperature of the Earth is -18.8°C which is boosted by the green house gasses in our atmosphere.
« Last Edit: 06/12/2011 07:47:41 by syhprum »


 

Offline Geezer

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How hot is Kepler B
« Reply #1 on: 06/12/2011 07:55:48 »
Obviously, it's "just right".
 

Offline CliffordK

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How hot is Kepler B
« Reply #2 on: 06/12/2011 11:07:03 »
the black body temperature of the Earth is -18.8°C which is boosted by the green house gasses in our atmosphere.

Oddly, our moon has a daytime average temperature of about 107°C, and a nighttime average of about -153°C which gives an overall average temperature of about -23°C

Obviously that 4°C difference in calculations between the Earth and the Moon is due to the horrendous greenhouse gases encircling the planet!!!

The newly identified planet Kepler B orbiting a M type star in 290 days placing it well within the "Goldilocks zone" is reputed to have a surface temperature of 22°C.
If this is a black body figure it may be too hot depending on the atmosphere bearing in mind that the black body temperature of the Earth is -18.8°C which is boosted by the green house gasses in our atmosphere.

Apparently the temperature wasn't measured directly, but rather estimated.  Here is what Wikipedia says about the temperature:

Scientists estimate that in the absence of atmosphere, the equilibrium temperature would be approximately -11°C. If the greenhouse effect caused by the atmosphere is Earthlike, this corresponds to approximately 22 °C (72°F) average surface temperature.

The radius is about 2.4x the radius of Earth.  My guess that the gravity would be intense there, although it will depend on the density and atmospheric thickness.

The big question is what the atmospheric composition is.  Hopefully there will be some answers in the next decade or so.

The oxygen in Earth's atmosphere is caused by plants.  Without the plants our atmosphere would certainly have much more CO2, and almost no free oxygen.  There is likely more Neon in the atmosphere than on Earth, and perhaps also Helium.

If we do confirm or disprove the oxygen content of the atmosphere, it will be some of the first real data for the Drake Equation.
 

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How hot is Kepler B
« Reply #2 on: 06/12/2011 11:07:03 »

 

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