DW> I don't know of any for sure, but I imagine that there are orbiting
 DW> pairs of asteroids in which the centre of gravity of the pair is
 DW> somewhere in space between the two bodies. So I suppose they should be
 DW> called double asteroids, according to this criterion.

I don't know if it's quite what you're thinking about, but there
are a pair of moons at Saturn that are near enough in the same
orbit at the same place, that they interact and swap orbits.

Paul Rogers, paulgrogers{at}yahoo.com                       -o)
http://www.angelfire.com/or/paulrogers                   /\\
Rogers' Second Law: Everything you do communicates.     _\_V

... ...and now back to my original lurk mode...
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