Other
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..483l&link_type=abstract
In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 483-486 (SEE N88-21884 14-91)
Other
Comet Nuclei, Fractals, Porosity, Density (Mass/Volume), Ice, Silicates
Scientific paper
The bulk porosity of a cometary nucleus is explained as the fraction of its total volume equal to the void space as complementary to the cometary solid matter while responsible for its low bulk density. This void space is composed of two parts: one resulting from a loose open structure and the other distributed among abundant intergranular and intercrystalline meso-, micro- and ultramicrosized pores inside distinct mineral species. In terms of the differences in intrinsic and apparent densities, the volume of the pore space inside the involatile silicate and the volatile icy phases is 4.7 times 0.0001 cu m/kg and 9.0 times 0.0001 cu m/kg respectively. For the apparent density of the nucleus, 200 kg/cu m, the bulk porosity is 80.56 percent the contribution of the free volume being 79.44 percent of the total volume. The fractal structure of the analyzed nucleus was characterized by the fractal dimension near to 3.0
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