Re: TLEs of XMM

From: Tony Beresford (
Date: Fri Apr 07 2000 - 06:56:29 PDT

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    At 22:53 7/04/00 , Bruno Tilgner wrote:
    >This morning (Friday 7 April, around 9:00 UTC) I downloaded from OIG
    >the latest TLEs for XMM. What surprises me is that they are from
    >day 99, i.e. 8 April. Are they the result of an extrapolation or has
    >OIG not noticed that we had a 29 February ?
    Bruno, this sort of thing turns up in the TLe's for anything that has
    a period much greater than one day. US SPACECOM just updates the elements
    to the time of the next equatorial crossing, whether this is in the future
    at the time or not. it shows up in the chandra tle's too, and caused
    some wierd ordering of tle's while chandra was getting to its final
    orbit, with the aid of its rocket engine.
    Tony Beresford
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