Planets
253 Mathilde
(Contd. from page 1...)Mathilde's density is only 1.4 gm/cm^3. It is probably very porous, somewhat like styrofoam. This may help account for the large craters.
It's albedo is only 4%. Furthermore, its surface color is very uniform despite the deep craters. This indicates that its interior is homogeneous, perhaps a pristine sample of the early solar system.
Another oddity is that Mathilde's rotation rate is very slow, 17.4 days. Perhaps this is somehow due to the many large impacts it obviously suffered.