The place to go for all information about observing Iridiums is http://www2.satellite.eu.org/iridium.html This includes links to the various sources for Iridium elset files: http://oig1.gsfc.gov/files/iridium.tle http://celestrak.com/NORAD/elements/iridium.txt http://www.fc.net/~mikem/iridium.html http://www.wingar.demon.co.uk/satevo/tle/iridiums.tle Of these, you may find that the last one is usually the most up-to-date - I update its contents several times daily. Also, the last two sources are the only ones using the "official" Motorola-provided Iridium numbers. Alan -- Alan Pickup | COSPAR 2707: 55d53m48.7s N 3d11m51.2s W 156m asl Edinburgh | Home: alan@wingar.demon.co.uk +44 (0)131 477 9144 Scotland | SatEvo page: http://www.wingar.demon.co.uk/satevo/