Chapter 9 — The apparent retrograde motions of our “P-Type” planets

Unless you are an astrophysicist, you might wonder what a “P-Type” planet is. A clear explanation can be found at this web page of the Vienna University’s department of Astrophysics. Dynamics and observational prospects of co-orbital planets in double stars by Dr. Richard Schwarz (2017) Please overlook the highly elliptical orbital shapes in this graphic
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