Re: News reports on 'spy satellite' deorbit

From: Marco Langbroek (
Date: Mon Jan 28 2008 - 12:49:35 UTC

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      <> wrote:
     >> I used SatEvo with McCants latest classified tle for USA 193 and it gave a
     >> decay date at 2 April. Does anyone tried this program or something else?
    daniel crawford wrote:
    > I got the same date using SatEvo and a different element.
    The outcome depends on what F10.7 value for the influence of solar activity on 
    the atmosphere you specify for the SatEvo run. You used the default value, but 
    using the current value (about 70) by setting the appropriate flag on run it 
    results in March 22.
    But that date no doubt will change over time as we come nearer to decay.
    I posted a small diagram showing how USA 193 is increasingly losing altitude 
    over time the past year as part of my post here:
    Helmets on chaps!   ;-)
    - Marco
    Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
    Cospar 4353 (Leiden):   52.15412 N, 4.49081 E (WGS84), +0 m ASL
    Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL
    Station (b)log:
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