Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/26999
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dc.contributor.authorMichikami, Tatsuhiroen_UK
dc.contributor.authorHagermann, Axelen_UK
dc.contributor.authorKadokawa, Tokiyukien_UK
dc.contributor.authorYoshida, Akifumien_UK
dc.contributor.authorShimada, Akiraen_UK
dc.contributor.authorHasegawa, Sunaoen_UK
dc.contributor.authorTsuchiyama, Akiraen_UK
dc.date.accessioned2018-04-14T01:09:10Z-
dc.date.available2018-04-14T01:09:10Z-
dc.date.issued2016-01en_UK
dc.identifier.urihttp://hdl.handle.net/1893/26999-
dc.description.abstractLaboratory impact experiments have found that impact fragments tend to be elongated. Their shapes, as defined by axes a, b and c, these being the maximum dimensions of the fragment in three mutually orthogonal planes (a≥ b≥ c), are distributed around mean values of the axial ratios b/. a~. 0.7 and c/. a~. 0.5. This corresponds to a:. b:. c in the simple proportion 2:2:1 The shape distributions of some boulders on Asteroid Eros, the small- and fast-rotating asteroids (diameter <200. m and rotation period <1 h), and asteroids in young families, are similar to those of laboratory fragments created in catastrophic disruptions. Catastrophic disruption is, however, a process that is different from impact cratering. In order to systematically investigate the shapes of fragments in the range from impact cratering to catastrophic disruption, impact experiments for basalt targets 5-15. cm in size were performed. A total of 28 impact experiments were carried out by firing a spherical nylon projectile (diameter 7.14. mm) perpendicularly into the target surface at velocities of 1.60-7.13. km/s. More than 12,700 fragments with b≥ 4 mm generated in the impact experiments were measured. We found that the mean value of c/ a in each impact decreases with decreasing impact energy per unit target mass. For instance, the mean value of c/ a in an impact cratering event is nearly 0.2, which is considerably smaller than c/ a in a catastrophic disruption (~0.5). The data presented here can provide important evidence to interpret the shapes of asteroids and boulders on asteroid surfaces, and can constrain current interpretations of asteroid formation. As an example, by applying our experimental results to the boulder shapes on Asteroid Itokawa's surface, we can infer that Itokawa's parent body must have experienced a catastrophic disruption. © 2015 The Authors.en_UK
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.relationMichikami T, Hagermann A, Kadokawa T, Yoshida A, Shimada A, Hasegawa S & Tsuchiyama A (2016) Fragment shapes in impact experiments ranging from cratering to catastrophic disruption. Icarus, 264, pp. 316-330. https://doi.org/10.1016/j.icarus.2015.09.038en_UK
dc.rightsCopyright 2015 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).en_UK
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en_UK
dc.subjectImpact processesen_UK
dc.subjectCollisional physicsen_UK
dc.subjectAsteroidsen_UK
dc.subjectAsteroid Itokawaen_UK
dc.titleFragment shapes in impact experiments ranging from cratering to catastrophic disruptionen_UK
dc.typeJournal Articleen_UK
dc.identifier.doi10.1016/j.icarus.2015.09.038en_UK
dc.citation.jtitleIcarusen_UK
dc.citation.issn0019-1035en_UK
dc.citation.volume264en_UK
dc.citation.spage316en_UK
dc.citation.epage330en_UK
dc.citation.publicationstatusPublisheden_UK
dc.citation.peerreviewedRefereeden_UK
dc.type.statusVoR - Version of Recorden_UK
dc.citation.date23/09/2015en_UK
dc.contributor.affiliationKindai Universityen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationKyoto Universityen_UK
dc.contributor.affiliationKindai Universityen_UK
dc.contributor.affiliationKyoto Universityen_UK
dc.contributor.affiliationJapan Aerospace Exploration Agencyen_UK
dc.contributor.affiliationKyoto Universityen_UK
dc.identifier.isiWOS:000365150300027en_UK
dc.identifier.scopusid2-s2.0-84944931023en_UK
dc.identifier.wtid878236en_UK
dc.contributor.orcid0000-0002-1818-9396en_UK
dc.date.accepted2015-09-23en_UK
dcterms.dateAccepted2015-09-23en_UK
dc.date.filedepositdate2018-04-12en_UK
rioxxterms.apcnot requireden_UK
rioxxterms.typeJournal Article/Reviewen_UK
rioxxterms.versionVoRen_UK
local.rioxx.authorMichikami, Tatsuhiro|en_UK
local.rioxx.authorHagermann, Axel|0000-0002-1818-9396en_UK
local.rioxx.authorKadokawa, Tokiyuki|en_UK
local.rioxx.authorYoshida, Akifumi|en_UK
local.rioxx.authorShimada, Akira|en_UK
local.rioxx.authorHasegawa, Sunao|en_UK
local.rioxx.authorTsuchiyama, Akira|en_UK
local.rioxx.projectInternal Project|University of Stirling|https://isni.org/isni/0000000122484331en_UK
local.rioxx.freetoreaddate2018-04-12en_UK
local.rioxx.licencehttp://creativecommons.org/licenses/by-nc-nd/4.0/|2018-04-12|en_UK
local.rioxx.filename1-s2.0-S0019103515004522-main.pdfen_UK
local.rioxx.filecount1en_UK
local.rioxx.source0019-1035en_UK
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