Assertion: asteroid belt's asteroid | /r/HasAspect | mean rotation period
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text: The largest asteroids (those with diameters greater than about 200 km [120 miles]) have a mean rotation period close to 8 hours; the value increases to 13 hours for asteroids with diameters of about 100 km (60 miles) and then decreases to about 6 hours for those with diameters of about 10 km (6 miles).