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David,
Some questions to ask:
1. Is a 3 month period long enough to establish such long periods, especially since the amplitude is near the lower limit of measurement based on catalogue error.
2. Can you exclude a precessional effect over a 3 month arc. How has the asteroids observation geometry changed in that time?
3. Why do we assume that the asteriod had a defined starting rotational speed at formation? I'm not up to speed on this theory.
Terry
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