An Estimate of Eros's Porosity and Implications for Internal Structure |
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| Authors: | Sarah L WilkisonMark S Robinson Peter C ThomasJoseph Veverka Timothy J McCoyScott L Murchie Louise M ProckterDonald K Yeomans |
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| Institution: | a Department of Geological Sciences, Northwestern University, Evanston, Illinois, 60208, f1sarah@earth.nwu.eduf1b Department of Astronomy, Cornell University, Ithaca, New York, 14853c Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, DC, 20560-0119d Applied Physics Laboratory, Laurel, Maryland, 20723e Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, 91109 |
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| Abstract: | Earth-based spectral measurements and NEAR Shoemaker magnetometer, X-ray, and near-infrared spectrometer data are all consistent with Eros having a bulk composition and mineralogy similar to ordinary chondrite meteorites (OC). By comparing the bulk density of 433 Eros (2.67±0.03 g/cm3) with that of OCs (3.40 g/cm3), we estimate the total porosity of the asteroid to be 21-33%. Macro (or structural) porosity, best estimated to be ∼20%, is constrained to be between 6 and 33%. We conclude that Eros is a heavily fractured body, but we find no evidence that it was ever catastrophically disrupted and reaccumulated into a rubble pile. |
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| Keywords: | Eros |
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