Q:  What is the ratio of photons emitted per second per square meter
              by the star to the number emitted by the planet?

                 (I've computed the values below properly,
                  but one should be able to estimate by eye pretty well)


          wavelength                ratio (star / planet)
       -----------------------------------------------------
             1  micron                 1900

             2                           60

             5                           10

            10                            6

            20                            5
       -----------------------------------------------------