Re: Has OIG "lost" Iridium 84 ?

From: Tony Beresford (aberesford@iprimus.com.au)
Date: Thu Jan 11 2001 - 05:23:13 PST

  • Next message: Rod Sladen: "Re: Has OIG "lost" Iridium 84 ?"

    At 22:40 11/01/01 , Tony Beresford wrote:
    >....
    >A little investigation shows I have early morning passes of Ir53
    >and ir10 18 minutes apart. I have constructed a quasi-element set
    >that crosses the equator 9 minutes after ir53. The weather shouldnt be
    >a problem ( it was clear and hot(37C) today, and promises to be so
    >tomorrow.
    >Irdium 84
    >1 25530  98066D   01011.00576000   .0000400
    >2 25530  86.3944 338.02   000237   65.0000 295.0000 14.34221200000008
    An alternative scenario might be that nothing more happened due to
    a failure in the electronics, or the propulsion system, and the orbit
    is that published, but with a natural small drag term. Here is another
    butchered elset
    Iridium 84 ?     4.0  1.8  0.0  6.0 d  7.3       724 x 721 km
    1 25530U 98066D   01005.63685683  .00000400  00000-0 -55546+1 0  1485
    2 25530  86.5376 340.1197 0002257 311.1302  49.0069 14.51006879116045
    It must be a coincidence but the predictions from either of these
    elset differ only 2-3 minutes in time at 17:50 UT Jan 11.
    
    Tony Beresford 
    8597, -34.9638, 138.6333E
    
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