SphereOfInfluenceHelio:

Path: Orbit/OrbitMechanics

% Computes the ratio of the sphere of influence for interplanetary
 missions.

 planet                    sun
 ?-------------------------?
 |<---------- 1 ---------->|
 |----->|
  rOR

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   Form:
   rOR = SphereOfInfluenceHelio
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   ------
   Inputs
   ------
   k    (1,:) Planet ID 1 = Mercury 9 = Pluto

   -------
   Outputs
   -------
   rOR	(:)  Ratio of sphere of influence for the planet to
            distance between the planet and sun

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	  References:	Wiesel, W. E., Spaceflight Dynamics, McGraw-Hill, 1988,
               pp. 288-291.
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