Gentlefolk
<< The positional data you'd get from a flyby is
not that helpful -- ground-based radar will do better. >>

An exception to this would be if there's a high resolution camera on board.  
Pictures of the body against the background star field are very useful in 
astrogation.  Such "navigation shots" were used extensively in the Voyager 
program, and, if memory serves, a moon or two was discovered in navigation 
shots.

--Best, Gerald

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