Re: Fengyun 1C Debris - Norad 30051

From: George Roberts (gr@gr5.org)
Date: Mon Mar 16 2009 - 14:06:00 UTC

  • Next message: John Burns: "Re: Fengyun 1C Debris - Norad 30051"

    I suspect the drag factor is so high that by now, almost a month later, the 
    orbit has a negative period (the software thinks it's going the other direction) 
    and a negative altitude, or some similar math error (it lowered to the center of 
    the earth and kept going out the other side so to speak).  So in a sense, yes 
    this seems to be an algorithm error in the software.
    
    - George Roberts
    http://gr5.org
    
    ----- Original Message ----- 
    From: "B Gimle @ComHem" <b.gimle@comhem.se>
    To: "John Burns" <seesat@john.geek.nz>; <SeeSat-L@satobs.org>
    Sent: Monday, March 16, 2009 9:53 AM
    Subject: Re: Fengyun 1C Debris - Norad 30051
    
    
    > H-A has TLE from Feb.24:
    > - with that drag factor it should have decayed within a few days
    > Space-Track has the SAME last elset, with 'Decayed 2009-02-25' in the name
    > line!
    >
    >
    > ----- Original Message ----- 
    > From: "John Burns" <seesat@john.geek.nz>
    > To: <SeeSat-L@satobs.org>
    > Sent: Monday, March 16, 2009 2:18 PM
    > Subject: Fengyun 1C Debris - Norad 30051
    >
    >
    >> I'm having trouble modelling this piece in Code.
    >> It appears to be at an altitude of 4.4 million km at a speed of  400,000+
    >> km per second.
    >>
    >> Is this actually true?  www.n2y0.com confirms my figures, Heavens  above
    >> shows it as decayed while space track is still releasing TLE's  for it.
    >>
    >> I'm hoping this isn't a bug in the SGP algorithms.
    >>
    >> John
    >>
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