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   Computes the optimal circular capture radius and delta-v
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   Form:
   [dV, rP] = DVOCCapt( muS, muP, r, v )
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   Inputs
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   muS         (1,1)     Gravitational parameter of the sun
   muP         (1,1)     Gravitational parameter of the target planet
   r           (1,1)     Target planet heliocentric orbit radius
   v           (:)       The heliocentric velocity of the spacecraft

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   Outputs
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   rP                    Optimal circular radius
   dV                    Minimum delta-v

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