> One thing I do not understand is, when do TLEs began to qualify as being in an archive? I suppose that varies with the site. What if I want one from a week ago? Are they available at CelesTrak? That does indeed depend entirely on whoever is maintaining the archive. At present, the most reliable one that is pretty much up to date is at NASA OIG. Unfortunately, you have to be a registered user and submit requests by email. Response time is typically on the order of days. As a practical matter, if you know what objects you're going to be interested in, you'd do well to build your own archives using the older TLEs available on line at Celestrak and Jonathan McDowell's site and keeping them up to date with appropriate downloads from reasonably current sources like Celestrak, Heavens Above, Mike McCant's site and OIG. > I'm actually looking for the TLE that would be appropriate for early on the day of the Venus transit, i.e. June 8. This should be reasonably close, depending on the details of your application. (Courtesy Mike's data.) ISS 1 25544U 98067A 04160.67381583 .00014831 00000-0 13149-3 0 9518 2 25544 51.6316 9.1368 0005497 207.9891 196.8506 15.68822708316981 ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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