PToSMA:

Path: Orbit/OrbitMechanics

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   Compute the semi-major axis from an orbit period or mean motion.
   The default central body is the Earth.
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   Form:
   a = PToSMA( p, mu, type )
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   Inputs
   ------
   p            (1,1) or (6,1)  Period or mean motion
   mu           (1,1)           Gravitational parameter (default = 3.98600436e5)
   type         (1,1)           Specify type of units. Either
                                   (1)   Period in seconds
                                   (2)   Rate in revolutions per day
                                   (3)   Rate in rad/sec

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   Outputs
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   p            (1,1)           Period

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