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The 1332hr period was covered 1.5 times, enough to establish a period, just not refine it.
Given we know nothing about the targets shape or spin axis, all we know is the variation in phase angle. In this case there was only a 15 degree phase angle change over the period.
All asteroids started spinning but I don't know the theory or reasoning.
Note that My 'masters' have ruled out the effect of gravity from planets.
I should point out that I am an observer and not very strong on the theory/science.
Cheers
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