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## Main Question or Discussion Point

Hi,

I am trying to work out, for a given eccentricity,a known planet mass and a known value for the semi major axis is there a formula to work out the orbital speed of a planet around a central star?

I have looked around online with not much success and was wondering if anyone could point me in the right direction?

Cheers

I am trying to work out, for a given eccentricity,a known planet mass and a known value for the semi major axis is there a formula to work out the orbital speed of a planet around a central star?

I have looked around online with not much success and was wondering if anyone could point me in the right direction?

Cheers