Hi John,
Forgot to reply to:
"...Does your INTEGRAT function with Guide8 use the same JPL data
to speed up the time it takes to update asteroid elements to a
different epoch? If so, how do I setup that one to work?"
See
http://home.gwi.net/~pluto/integrat.htm#jpl_eph . Be
warned that the speedup isn't quite as dramatic as it is for
Find_Orb.
-- Bill