TLE re-issue rate

From: Tony Beresford (
Date: Wed Jun 06 2001 - 19:41:18 PDT

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    At 11:43 7/06/01 , you wrote:
    >Typically, how often are geosychronous TLE's (and other satellites in
    >even higher orbits of low eccentricity) updated?
    To give an example taken from OIG only a couple of minutes ago.
    The Last five TLE's for Superbird A ( #20040 ) span epochs
    from day 143.8 to 155.8 
    I delibrately chose a non-opertational satellite 
    With regard to IMP-8 . I imagine US SPACECOM has decided that
    IMP-8 will not ever come within the geosat distance, and therefore
    there is no point in tracking it given finite resources available
    to them. They have obviously made the same decision about satellites 
    WIND and GEOTAIL, both active satellites returning data, whose
    positions are available from the NSSDC space physics site.
    Tony Beresford 
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