RE: USA 144 decoy brightness variation

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Tue Sep 07 2010 - 16:44:44 UTC

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    Marco Langbroek wrote:
    
    > Now done, results here:
    > 
    > http://sattrackcam.blogspot.com/2010/09/again-usa-144-misty-2-decoy-brightness.html
    > 
    > Period 60 seconds. Interestingly, like on July 20th I again captured a specular 
    > glint at the bottom of one of the minima. This suggests there is a flat 
    > reflective surface on one of the smaller sides of this enigmatic object.
    
    Very interesting, Marco. I have updated the plot of the period of variation over time. It had been
    decreasing ~8 s annually, but the rate appears to have decreased considerably over the past year, so
    it may be approaching a minimum. I have plotted it with a linear fit and a 2nd order polynomial fit;
    I doubt there is any statistical significance, but the latter seems closer. Time will tell.
    
    http://satobs.org/seesat_ref/99028C_period_of_var/99028C_period_of_var_5a.pdf
    
    http://satobs.org/seesat_ref/99028C_period_of_var/99028C_period_of_var_5b.pdf
    
    Ted Molczan
    
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