Hi Larry,

"... It would be interesting to watch binaries, and Jupiter's
satellites revolve in orbit..."

For the former, Alt-J and '11' will indeed toggle off proper
motion (and, as John suggests, doing it again will turn proper
motion back on again). But the motion of Jupiter isn't really
"proper motion".

If what you mean is "I'd like to see Jupiter stay centered
on the chart, with the moons appearing to revolve around them",
I'd recommend that you zoom in on Jupiter until you've got a suitable
field of view with the satellites around it; then right-click on
Jupiter, then OK.

Then, go into the Animation dialog, and select the "Moving"
radio button. That way, when you start up animation, Jupiter
will stay centered and the moons appear to revolve around it.

As you might expect, this will work for other solar system
objects, so you can keep the moon locked to the center of the screen
and see it go through its phases, or track a satellite going
overhead, and so on.

I suppose that logically, one could consider a star to be
a moving object, too... that would remove the need for the
Alt-J/11 switch (at least for this purpose). You would then
see the binary go through its orbit, with other stars passing
by. But at least at present, if you click on a star and then
on the "moving" radio button, Guide tells you that "you must
first click on a planet, asteroid, or comet!" (Which I see is
out of date: add "satellite" to that list.)

-- Bill