- #1

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## Main Question or Discussion Point

Please tell me how to find the orbital energy of ellipse and hyperbolic trajectory.

Thank you.

Thank you.

- Thread starter IPhO' 2008
- Start date

- #1

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Please tell me how to find the orbital energy of ellipse and hyperbolic trajectory.

Thank you.

Thank you.

- #2

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Alternatively, if you know the semi-major axis(a), it can be found by:

[tex]-\frac{GM}{2a}[/tex]

for an ellipse

and

[tex]\frac{GM}{2a}[/tex] for a hyperbola.

- #3

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Please show me how to prove it.

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