Distance (AU)     Distance (m)      T (K)     peak wavelength (m)
  ---------------------------------------------------------------------------
       10             1.5 x 10^(12)       160      1.8 x 10^(-5)  =  18 microns

       20             3.0 x 10^(12)       113                        26 

       40             6.0 x 10^(12)        80                        36

      100             1.5 x 10^(13)        51                        57
  ---------------------------------------------------------------------------


      As you can see from the figure, this simple model
      does a very good job of matching the observations.