Phobos Grunt - Brightness not stable

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satrack@libero.it

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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