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Well I'm doing a group assignment based on orbital mechanics and my partner found a formula for eccentricity which is:

e = h^{2}/ μ_{Earth}/ (radius at perigee) - 1

Anyway when calculating h he said it was angular momentum:

h = (radius at perigee)*(velocity at perigee)

But it can't be because there's no mass component, so I'm worried we used the eccentricity formula wrong. Is the above formula for h correct? If so, what is it called?

Thanks!

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# Homework Help: What is this formula?

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