How fast do asteroids spin?

How fast do asteroids spin?

Fig. 12.9 . Two groups of asteroids are indicated on this plot of their rotation rates (vertical axis) versus size (horizontal axis). There are the large asteroids that rotate at a wide variety of speeds, except at the fastest rates, and the small asteroids that spin the fastest. No known asteroid larger than 200 meters across rotates faster than once every 2.4 hours, perhaps because these asteroids are piles of rubble that fly apart if spun too fast. Smaller asteroids, which can turn once every few minutes, must be solid rocks.

Copyright 2010, Professor Kenneth R. Lang, Tufts University