The internal structures and densities of asteroids

Details The internal structures and densities of asteroids The internal structures and densities of asteroids

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..479w&link_type=abstract

Meteoritics & Planetary Science, vol. 34, no. 3, pp. 479-483 (1999).

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Scientific paper

Four asteroidal bodies (the martian satellites Phobos and Deimos and the main-belt asteroids 243 Ida and 253 Mathilde) have now been the subjects of sufficiently close encounters by spacecraft that the masses and sizes and, hence, the densities of these bodies can be estimated to ~10%. All of these asteroids are significantly less dense than most members of the classes of meteorites identified as being compositionally most nearly similar to them on the basis of spectral characteristics. We show that two processes can act, independently or in concert, during the evolutionary histories of asteroids to produce a low bulk density. One of these processes is the result of one or more impact events and can affect any asteroid type, whereas the other can occur only for certain types of small asteroids which have undergone aqueous alteration.

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