Path: Orbit/OrbitCoord
% Computes the orbit radius and the parameter from equinoctial elements.
Since version 1.
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Form:
[r, p] = REq( eq )
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Inputs
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eq Elements vector [a,P1,P2,Q1,Q2,L]
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Outputs
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r Radius
p Parameter
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References: Battin, R.H., An Introduction to the Methods and Mathematics
of Astrodynamics, AIAA, New York, 1987, pp. 484-490.
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