Starry Night Pro is what I use to visualize the positions of various comets and asteroids from the perspective of the stereo spacecraft. It’s handy for a variety of reasons, it’s also easier to work with than Celestia, which is what I previously used in years past. Again, it can’t numerically integrate orbits over time, so it’s only used to compare the positions at orbital element epochs close to the time observation. ORSA can integrate those orbits over time and then the results be fed back into Starry Night if necessary, however.