For 2 bodies rotating in ellipses about their centre of mass, (62) p171 of Moulton (1914),(adsbygoogle = window.adsbygoogle || []).push({});

Periodic orbits gives the distance between them as a series in eccentricity e, with coefficients

linear combinations of cos kM, k=1,2,... where M=nt is the mean anomaly.

I once found the formula online but no luck since. I think the "-1" in the first line of (62) should not be there.

Is there a list of errata?

thanks

kit in nz

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# Radius at time t in the 2 body problem

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