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Homework Help: Temperature of a planet a distance from sun!

  1. Mar 14, 2009 #1
    1. The problem statement, all variables and given/known data
    A spinning shiny red-appearing planet at 130 billion km from the sun, has a diameter of 1700km.
    Estimate temperature of planet using simple heat balance equation.
    Estimate also the temperature obtained by Wien displacement law.

    2. Relevant equations
    I've been given no equations, but I know that shiny planets have an Albedo =1, and the wavelength or red = 650nm, which is useful for the Wien law [tex]\lambda[/tex]=b/T, where T is kelvin and b = 2.9x10^-3

    Temp of sun = 5800k
    Rad of sun = 6.96x10^8

    3. The attempt at a solution
    I don't know what equation there is to use! I've looked on the internet and gotten this eq.

    Tp = Ts((Rs/D^2)^(0.5))

    where Tp is temperature of planet, Ts of sun, Rs radius of sun, D distance to planet.
  2. jcsd
  3. Mar 15, 2009 #2


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    Last edited by a moderator: Apr 24, 2017
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