Robert H. McNaught, Anglo-Australian Observatory (RMN@aaocbn2.aao.gov.au)
Wed, 27 Mar 1996 16:04:30 +1100 (EST)

You could represent the orbit of a close approach comet as a highly HYPERBOLIC
geocentric orbit and this should be reasonable for several days I would have
thought.  However I suspect that most sat programs don't deal with hyperbolic
orbits.  There are many programs available that allow you to plot solar-system
objects as graphics or ephemerides, but don't ask me about them.  I just
know they exist.

Cheers, Rob