Using Chondrites to Understand the Inside of Asteroid 433 Eros

Details Using Chondrites to Understand the Inside of Asteroid 433 Eros Using Chondrites to Understand the Inside of Asteroid 433 Eros

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002psrd.repte..61m&link_type=abstract

Planetary Science Research Discoveries

Physics

433 Eros, Asteroid, Density, Porosity, Meteorites, Chondrites, Near Shoemaker

Scientific paper

Asteroid 433 Eros is one of the most closely scrutinized chunks of rocky debris in our solar system. We know about its bulk properties, internal mass distribution, and the shape, composition, and mineralogy of the surface from instruments on the Near Earth Asteroid Rendezvous (NEAR) Shoemaker spacecraft. Using mass and volume measurements scientists determined the bulk density of this asteroid for the first time. An interdisciplinary research team with expertise in cosmochemistry, planetary geology, remote sensing, and orbital dynamics compared this orbital information with density and porosity data from meteorite samples to estimate the porosity of the asteroid. Sarah Wilkison and Mark Robinson (Northwestern University), Peter Thomas and Joseph Veverka (Cornell University), Tim McCoy (Smithsonian Institution), Scott Murchie and Louise Prockter (Applied Physics Lab), and Donald Yeomans (Jet Propulsion Lab) report a macro (structural) porosity for Eros of approximately 20%. They compared this estimate with features seen on the surface of Eros and with previously proposed models for the formation of asteroids to conclude that Eros has been heavily fractured by impact collisions but was not demolished to the extent that it is now a rubble pile.

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