Retrograde planet

Ha... a planet, half the mass of Jupiter flung into a retrograde orbit? How massive was then the object that flung it out?


It would be cool if they provided any other details, such as the eccentricity of the orbit and other objects in the solar system.

I suppose the easiest way for this to happen would be to have this object in a highly eccentric orbit and another more massive object in a somewhat circular object, at slightly lower distance as the the Aphelion (do we call it that?) of the first object. That is where these two should meet up.

The second object would overtake the first one, coming up from behind, it would slow the first object down and start pulling it back.

I don't know if such a state would be stable through a long period of time though. It might send one planet hurtling towards the star or eject the other one out of the solar system.
 
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