Meteorite physical properties: implications for asteroids

Details Meteorite physical properties: implications for asteroids Meteorite physical properties: implications for asteroids

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..766f&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

Meteotites, Minor Planets

Scientific paper

Meteorites are believed to be samples of asteroids. We measured the porosity of carbonaceous and ordinary chondrite meteorites by He pycnometer and imaged the porosity by computed microtomography. We found fresh samples of most ordinary chondrites have ~5% to 15% porosity while carbonaceous chondrites have even higher porosity (up to 30% in Allende). This porosity occurs in three forms: extended cracks vugs or gaps between the matrix and the chondrules. We performed hypervelocity impact studies on chondritic meteorites to determine how the presence of chondrules in a more porous matrix effects fragmentation. The gaps between the chondrules and the matrix appear to enhance the ejection of whole chondrules or large chondrule fragments during hypervelocity impact while much of the debris significantly smaller than the chondrules is chemically-distinct matrix material. We measured the speed of sound bulk modulus and elastic modulus of several ordinary chondrite meteorites. The speed of sound ranges from 1100 m/sec in a fragment of Saratov an extremely friable ordinary chondrite up to 4000 m/sec in more compact ordinary chondrites. The weakest meteorites exhibit physical properties more comparable to volcanic tufts than to compact basalts. Modeling of stone asteroids needs to consider a wide range of physical properties.

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