Path: Orbit/OrbitMechanics
% Compute the energy for any orbit
   Since version 1.
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   Form:
   E = Energy( a, mu )
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   ------
   Inputs
   ------
   a                    Semi-major axis (is inf for a parabola and negative
                        for a hyperbola)
   mu                   Gravitational parameter
   -------
   Outputs
   -------
   E                    Energy
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   References: Wiesel, W. E., Spaceflight Dynamics, McGraw-Hill, 1988, pp. 53.
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Common: Graphics/Plot2D
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