Phobos Grunt - Brightness not stable

From: satrack@libero.it
Date: Mon Dec 05 2011 - 17:19:06 UTC

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    I have just observed a pass of Phobos Grunt on my way home for about 1 minute 
    before it entered shadow. 
    The brightness was not stable but slowly changed with a period of about 20 +- 
    5 s. I perceived only 2 cycles,
    however, I would say that it is actually tumbling.
    
    Best Regards,
    Simone
    
    
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