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Are some meteoroids rubble piles?
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SYSNO ASEP 0470253 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Are some meteoroids rubble piles? Author(s) Borovička, Jiří (ASU-R) RID, ORCID Source Title Asteroids: New Observations, New Models. - Cambridge : Cambridge University Press, 2016 - ISSN 1743-9213 - ISBN 9781107138254 Pages s. 80-85 Number of pages 6 s. Publication form Print - P Action Symposium of the International Astronomical Union /318./ Event date 03.08.2015 - 07.08.2015 VEvent location Honolulu Country US - United States Event type WRD Language eng - English Country GB - United Kingdom Keywords meteors ; meteoroids ; asteroids Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects GAP209/11/1382 GA ČR - Czech Science Foundation (CSF) Institutional support ASU-R - RVO:67985815 UT WOS 000455238100009 EID SCOPUS 84959569946 DOI https://doi.org/10.1017/S174392131500873X Annotation The possibility that some meteoroids in the size range 1 - 20 meters are rubble piles i.e. assembles of boulders of various sizes held together only by small van der Waals forces, is investigated. Such meteoroids are expected to start disrupting into individual pieces during the atmospheric entry at very low dynamic pressures of ~ 25 Pa, even before the onset of ablation. The heterogeneous bodies as Almahata Sitta (asteroid 2008 TC3) and Benešov are primary candidates for rubble piles. Nevertheless, by analyzing the deceleration, wake, and light curve of the Benešov bolide, we found that the meteoroid disruption started only at a height of 70 km under dynamic pressure of 50 kPa. No evidence for a very early fragmentation was found also for the Chelyabinsk event. Workplace Astronomical Institute Contact Anežka Melichárková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2017
Number of the records: 1