Hello, Allen Thomson's +4000 elsets cover about half of the visible/potentially visible/not visible (small debris) unclassified objects. The remaining 4000 objects not in Thomson's file are mostly debris objects with little potential for observation and of course, a few dozen or so classified elements. The few dozen or so classified elements are, of course, found in Ted Molczan files along with +1200 or so visible or potentially visible unclassified objects. Mike McCants maintains a listing of all unclassified +8600 objects on his web site, as well as the Molczan files, plus many other groupings of elsets, including just the classified elements. You can find links to these and many other sources of elements as well as tracking programs at: http://www.satellite.eu.org/tletools.html Keep in mind that if you are looking for non-LEO satellites (period >250 min.) your tracking program needs an orbit propagator (SDP4) for deepspace or highly eccentric objects. Not all tracking programs have the SDP4 feature. You can find links to various tracking programs at the same site but at the orbsoft.html page. Hope this helps. Jeff Hunt <firstname.lastname@example.org> --- On Sun, 28 Sep 1997 14:06:03 +0300 (EET DST) Marco Hahn FS <email@example.com> wrote: >During my last two sessions I saw 8 unanticipated satellites, and I really >like to try to identify them later. However, while I almost all the time >was able to identify sats, of these 8 only 2 could be identified using the >750KB long el970920-file. This worries me quite a bit. Are there other >files that I could check?