GravityGradientEigenvalues:

Path: SCPro/DynamicalModels

% Compute the eigenvalues for a gravity gradient stabilized spacecraft.
   We assume it is in the LVLH orientation.

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   Form:
   [e, a] = GravityGradientEigenvalues( inr, r, v, mu )
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   ------
   Inputs
   ------
   inr                (3,3) Inertia matrix
   r                  (3,1) r in ECI
   v                  (3,1) v in ECI
   mu                 (1,1) Gravitational Parameter

   -------
   Outputs
   -------
   e                  (6,1) Eigenvalues
   a                  (6,6) State matrix
   

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