{"id":28649,"date":"2021-08-25T13:32:41","date_gmt":"2021-08-25T11:32:41","guid":{"rendered":"https:\/\/karmaka.de\/?p=28649"},"modified":"2021-09-05T10:36:26","modified_gmt":"2021-09-05T08:36:26","slug":"internal-rubble-properties-of-asteroid-101955-bennu","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=28649","title":{"rendered":"Internal rubble properties of asteroid (101955) Bennu<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>P. Tricarico, D. J. Scheeres, A. S. French, J. W. McMahon, D. N. Brack, J. M. Leonard, P. Antreasian, S. R. Chesley, D. Farnocchia, Y. Takahashi, E. M. Mazarico, D. Rowlands, D. Highsmith, K. Getzandanner, M. Moreau, C. L. Johnson, L. Philpott, E. B. Bierhaus, K. J. Walsh, O. S. Barnouin, E. E. Palmer, J. R. Weirich, R. W. Gaskell, M. G. Daly, J. A. Seabrook, M. C. Nolan, D. S. Lauretta<\/p>\n\n\n\n<p>accepted to Icarus<br>Draft 25 August 2021<\/p>\n\n\n\n<p><a href=\"https:\/\/arxiv.org\/pdf\/2108.10416.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p>Update (5 September): Icarus <a rel=\"noreferrer noopener\" href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0019103521003225\" target=\"_blank\"><strong>LINK<\/strong><\/a><\/p>\n\n\n\n<p>&#8220;Highlights<\/p>\n\n\n\n<p>\u2022 The size-frequency distribution of the internal rubble is consistent with what is observed on the surface.<br>\u2022 The estimated bulk density of the rubble is lower than that of representative meteoritic samples, indicating significant micro-porosity.<br>\u2022 The estimated low macro-porosity indicates relatively tight packing of the rubble, possibly due to fragile rubble blocks.&#8221;<\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Exploration of asteroid (101955) Bennu by the OSIRIS-REx mission has provided an in-depth look at this rubble-pile near-Earth asteroid. In particular, the measured gravity field and the detailed shape model of Bennu indicate significant heterogeneities in its interior structure, compatible with a lower density at its center. Here we combine gravity inversion methods with a statistical rubble-pile model to determine the density and size-frequency distribution (SFD) index of the rubble that constitutes Bennu. The best-fitting models indicate that the SFD of the interior is consistent with that observed on the surface, with a cumulative SFD index of approximately \u22122.9. The rubble bulk density is approximately 1.35 g\/cm3, corresponding to a 12% macro-porosity. We find the largest rubble particle to be approximately 145 m, whereas the largest void is approximately 10 m. &#8220;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>P. Tricarico, D. J. Scheeres, A. S. French, J. W. McMahon, D. N. Brack, J. M. Leonard, P. Antreasian, S. R. Chesley, D. Farnocchia, Y. Takahashi, E. M. Mazarico, D. Rowlands, D. Highsmith, K. Getzandanner,&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,2350,552,181,1184],"tags":[5719,6090,4599,553,4827,1202,1886,2139],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28649"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=28649"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28649\/revisions"}],"predecessor-version":[{"id":28733,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28649\/revisions\/28733"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=28649"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28649"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28649"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}