Seth, You're welcome. - Kurt P.P.S. - As a point of amateur practice beyond the scope of your original question, there are three other sources for the most recent orbital elements for current "hot" inbound comets and asteriods. Sometimes there is a delay between the announcement of the newest orbital solution for a reacquired inbound comet and the updating of the MPC third-party-software data files. In that case, the orbital elements have to be entered into your software manually, something that personally I'm useless at. Personally, I don't go this far for simple visual observing. NEO Minor Body applet http://neo.jpl.nasa.gov/orbits/ JPL NASA Ephemeris http://ssd.jpl.nasa.gov/horizons.cgi Harvard MPC Comet Orbital elements list http://cfa-www.harvard.edu/iau/Ephemerides/Comets/index.html Sometimes the NEO-JPL sources are more timely in updating the most current orbital elements than the master Harvard Minor Planet Center list (e.g. for P17/Holmes). I like the NEO applet the best. Orbital elements change on each pass due to non-gravitational forces (like jets coming of a comet or the pressure of sunlight on asteriods). The NEO applet lets you choose between the most recent hot-of-the-press orbital elements and the historical passes, sometimes going back to the 1800s. ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs