Density and Porosity of Shower Meteorites as Indicators of Meter-scale Asteroid Homogeneity

Details Density and Porosity of Shower Meteorites as Indicators of Meter-scale Asteroid Homogeneity Density and Porosity of Shower Meteorites as Indicators of Meter-scale Asteroid Homogeneity

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.3302m&link_type=abstract

American Astronomical Society, DPS meeting #40, #33.02; Bulletin of the American Astronomical Society, Vol. 40, p.455

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Meteorite showers containing multiple stones from the same event provide clues to the homogeneity of meteorite parent bodies over decimeter to meter scales. Small bodies that have been studied in detail show a high degree of surface mineralogical homogeneity in reflectance spectra (Abe et al., 2006a; Veverka et al., 2001) and no detectable large scale density variations (Abe et al., 2006b; Thomas et al., 2002). Large meteorite showers provide a direct sample of the possible variations in physical properties of small bodies. We present the results of density, porosity, and magnetic susceptibility measurements of at least ten stones each from seven meteorite showers in the collection at the Smithsonian Institution's National Museum of Natural History. This includes three carbonaceous chondrites (Allende, Murchison and Murray) and four ordinary chondrites. We find strong homogeneity within showers. For example, the mass-weighted average grain density of Allende we measured as 3.60 g/cm3, with individual stones ranging from 3.59 to 3.62 g/cm3 and typical uncertainties 0.03 or 0.04 g/cm3. Allende porosities averaged 18.8% and ranged from 17.8% to 19.5% with typical uncertainties of about 1.2%. We also studied one weathered find (Gold Basin) for clues regarding the uniformity of chondrite weathering. For five showers, we compare results with measurements made on additional stones at the Vatican Observatory and the American Museum of Natural History.
This work was supported in part by a Smithsonian Institution Graduate Student Fellowship.
Veverka, J. et al., 2001. Science 289, 2088.
Abe S. et al., 2006b. Science 312, 1344.
Abe M. et al., 2006a. Science 312, 1334.
Thomas P. et al., 2002. Icarus 155, 18.

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