Hi friends, I am running some sophisticated decay-programs, based on my earlier duties as the head of a satellite-tracking station (Wilhelm-Foerster-Observatory, Berlin, Germany), working more then 25 years for US agencies (SAO NORAD,NASA). 1997-58D - Inspektor (SSC 25100) - is a test object with all known parameters. OIG has a prediction for the reentry on October 25. That is 4-5 days too early. What I need is your observations to check the TLEs and the period of tumbling, to test my programs. By the the way: It is not a competition to Alan Pickups fine work in general reentry predictions. My special investigations, based on earlier developments, like the NORAD- Spiral Decay Program- we have nearly a quarter of a century experience with this type of work- and need the input of a lot of special parameters. Clear skies Harro Harro Zimmer Berlin, Germany Harro.Zimmer@t-online.de