I an trying to calculate the temperature of a hypotethical planet orbiting the CHARA star at a distance of 1 AU. Now I know that the luminosity of Sol is 4x10^26 watts and that Chara's is about 20% more so 4.8x10^26 watts.(adsbygoogle = window.adsbygoogle || []).push({});

I found the following equation to calculate it:

( L )

Temp ( in K ) = (--------------) 1/4

(16*pi*S*R^2 )

L = Luminosity of star

S = Stefan-Boltzmann constant wich should be 5.67x10^-8

R = radius of planetary orbit in meters where 1 AU is .94x10^12, squared....

Heres where I foud this equation:

http://spiff.rit.edu/classes/phys230/lectures/life/life.html

I end up with stupid 476510.66 K ... this is supposed to be a planet, not a quasar ! Where am I wrong ?

Thanks for help !

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Help with planetary temp. equation

**Physics Forums | Science Articles, Homework Help, Discussion**