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## Main Question or Discussion Point

Can anyone suggest how to calculate the semi major axis of a body in an elliptical orbit when all I've got is x,y,z,vx,vy and vz?

I'm guessing I need to calculate the eccentricity too. I really suck at conversions like this. :(

I'm guessing I need to calculate the eccentricity too. I really suck at conversions like this. :(