Does anyone have or know of a program that will determine (or approximate) the orbit required for a rendezvous? In particular, I'm thinking about the upcoming rendezvous between the space shuttle and the Hubble Space Telescope. (Shuttle/Mir rendezvous are also of interest). My thinking is that the launch date/time is usually known, and the time of rendezvous is known (sometimes from news reports) or can be guessed. Based on this info, can an orbit be determined with enough accuracy (plus or minus 10 minutes) to watch for the shuttle? An added benefit of such a program would be to plan and correct for launch delays. (It seems that they usually happen, and pre-launch elements/vectors are usually only for the nominal launch time. Correct?) John Holtz JWHoltz@aol.com Pittsburgh PA 40d 37' 33.6" N 79d 48' 45.3" W 1330 ft elev