> If you can find another program to show orbits (I don't know
> of one, but surely _someone_ must have done this!), I'd
> advise using it. Otherwise, let me know, and I'll post mine,
> and you can give it a try... I only suggest you look elsewhere
> because mine was a quick, dirty, not-very-good effort.

The good ol' planetarium program "Dance of the Planets" by ARC Inc
did indeed draw orbits of all natural satellites known back then,
even integrating them numerically so you could watch how each orbit
of e.g. Jupiter's outer satellites changed significantly from one
revolution to the next. "Dance" is nowadays an orphaned program
though; the last version was released in 1994, shortly before SL-9
slammed into Jupiter (an event nicely simulated with that version of
"Dance" too, with impact flashes and all). "Dance" ran on plain
MS-DOS and was written in Turbo Pascal - apparently it was one of the
many older DOS astronomy programs which didn't survive the switch to
Windows.

The user had no way of adding new planetary satellites to "Dance",
all the user could do was to add new asteroids and/or comets.

Was "Dance" a "pretty pictures" planetarium program or a serious
observation planner? Well, neither really - although the appearance
of the simulated sky was pretty pretty :-) the strong point of
"Dance" was the built-in numerical integration facilities which were
enabled all of the time. So "Dance" was really an "orbital
simulation laboratory": you could define orbital elements of a new
(or imaginary) asteroid such that it passed close to Jupiter, and
then watch its orbit get severely perturbed by Jupiter. The weak
point of "Dance" were deep-sky objects and faint stars - the last
verison included the PPM catalog as an option but noting more.