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Mean distance from the sun

  1. Jan 24, 2010 #1
    1. The problem statement, all variables and given/known data

    Phobos is the larger and closer of Mars’s two moons. It has no atmosphere, a mean radius of 11 km, an albedo of 0.07, and an emissivity of 1.0.

    (i) Assuming that the radiative temperature of Phobos is 222 K and that it is spherical, what is its mean distance from the sun?

    (ii) Mars is much cooler than the Sun (210 K) but much closer to Phobos (9.38*10^6 m). Its radius is 3.4*10^6 m. Does the radiation from Mars have a significant effect on the temperature of Phobos?


    2. Relevant equations
    BOltzman euation =1.0 * sigma* T^4


    3. The attempt at a solution
    I do not know where to start this please help!
     
  2. jcsd
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