RE: near resonance of 96 72A (usa 129)

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Tue Feb 14 2012 - 03:13:40 UTC

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    Tony Beresford wrote:
    
    > The current orbit of usa 129 is very nearly 15 revs/day,
    > and I have had 2 passes each evening at close to the
    > same alt-az on successive days. I dont recall this happening
    > in previous years since launch.
    
    It was about one month from exact 15:1 resonance (which would have occurred when mean motion reached ~15.00907 rev/d)
    when you and Greg Roberts observed it in November 2011:
    
                                                             289 X 843 km
    1 24680U 96072A   11319.79117576  .00024500  00000-0  33505-3 0    05
    2 24680  97.6865   9.0108 0399173  36.4459 323.5539 14.99376827    00
    
    Greg recovered it at the end of December, by which time it had raised its perigee:
    
                                                             311 X 835 km
    1 24680U 96072A   11364.78318417  .00010000  00000-0  18802-3 0    04
    2 24680  97.6865  53.5714 0376658 243.9399 116.0600 14.97086013    05
    
    I estimate that the reboost occurred near Dec 15, about the time it would have reached 15:1 resonance.
    
    Ted Molczan
    
    
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