Vis Viva Equation
For any Kepler orbit (elliptic, parabolic, hyperbolic or radial), the vis viva equation is as follows:
where:
- is the relative speed of the two bodies
- is the distance between the two bodies
- is the semi-major axis (a>0 for ellipses, or =0 for parabolas, and a<0 for hyperbolas)
- is the gravitational constant
- are the masses of the two bodies
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