Understanding Elliptical Orbits: Foci, Center, Barycenter, and Mass Relationship

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mhuang
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What is the relationship between the following in an elliptical orbit:

-foci
-geometric center
-barycenter
-the more massive body/the less massive body

Also, what path does the larger mass take?
 
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This seems like homework. If it is, then it belongs in the homework help section, and you need to show some attempt at what you've done so far. (Don't post another thread in the homework help section, just let me know if it is homework and it will be moved).

Regarding your question: what relevant equations do you have in your books/notes pertaining to ellipses?
 

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