David Buck wrote:

> You need to have the two planets separated more than the Roche Limit 
> otherwise the tidal forces will tear them apart.  In this case, they are 
> about 10x the Roche Limit.  Within that range, it should be fine over 
> long periods of time (billions of years) but I haven't done the 
> simulations to verify that.
> 
> David Buck

Based on my undergraduate level physics education, I would say the other stability
limit is that the separation of the two planets should be substantially less than the
separation of the center of mass from the star.

Stability issues primarily occur with 3-body systems: they have a habit of ejecting
one of their members.  So as long as the system is a 2-body system, where one of these
bodies is itself a 2-body system, you're okay.

Dan

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