1. The problem statement, all variables and given/known data Hi, 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. help!