Re: archived TLEs from NASA

From: Allen Thomson (
Date: Tue Jun 15 2004 - 15:38:03 EDT

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    > 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.)
    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
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