Temperature of a planet a distance from sun

[tetris11]

Homework Statement

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.

Homework 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 $$\lambda$$=b/T, where T is kelvin and b = 2.9x10^-3

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

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!

 

[MathematicalPhysicist]

Well, first the equation isn't correct unitwise.
Second, does this link helps:
http://ceres.hsc.edu/homepages/classes/astronomy/spring99/Mathematics/sec20.html
The luminosty of the planet you can find by the relation:
$$L_{planet}=4\pi L_{sun} \frac{d_{sun}^2}{d_{planet}^2}$$
where the d's are the distances from the Earth of the sun-earth red planet-earth (or solar system).