ConjunctionPlane:

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  Transformation matrix for relative conjunction geometry. The inertial
  relative state is defined by:
    rRel = R2 - R1
    vRel = V2 - V1 - omega1 x rRel

   Since version 10.
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  Form: 
  C = ConjunctionPlane( xHills )
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  -------
  Inputs:
  -------
  xRel  (6,1)  Relative state

  --------
  Outputs:
  --------
  C     (3,3)  Conjunction plane transformation
              
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   Reference: J. Russell Carpenter, 'Conservative Analytical Collision 
   Probability for Design of Orbital Formations', 2004
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Children:

Math: Linear/Cross
Math: Linear/Mag