In article <3d97179b@news.povray.org>, war### [at] tagpovrayorg says...

>   In this sense it's perfectly possible to have an unstable orbit in
> a two-body system (eg. simply by having them in collision course; it's
> also possible that they will escape to infinity with respect to each other
> if the minimum escaping speed is reached).

But then it is no orbit at all. Of course it can collide, or escape to 
infty, but if it orbits at all, it will orbit forever (that is what I 
mean with stable).

Lutz-Peter

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