Mechanical properties of particles from the surface of asteroid 25143 Itokawa
Tanbakouei, Safoura (Institut d'Estudis Espacials de Catalunya)
Trigo-Rodríguez, J.M (Institut d'Estudis Espacials de Catalunya)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Michel, Patrick (Centre National de la Recherche Scientifique (França))
Blum, Jürgen (Technische Universität Braunschweig. Institut für Geophysik und extraterrestrische Physik (Germany))
Nakamura, Tomoki (Tohoku University. Department of Earth Science (Japan))
Williams, Iwan (Queen Mary University of London. School of Physics and Astronomy)

Data:	2019
Resum:	Aims. Asteroids have been exposed to impacts since their formation, and as a consequence their surfaces are covered by small particles, pebbles, and boulders. The Japanese JAXA/ISAS Hayabusa mission collected micron-sized particles from the regolith of asteroid 25143 Itokawa. The study in terrestrial laboratories of these particles provides a scientific opportunity as their physical properties can be compared with those characteristic of chondritic meteorites that are often considered proxies of the building materials of potentially hazardous asteroids (PHAs). Methods. Here we present the results from a study of the mechanical properties of three of these particles using a precise technique called nanoindentation. The derived results are compared with those obtained via a methodology similar to that used for the Chelyabinsk meteorite. Results. The reduced Young's modulus values obtained for the Itokawa samples are higher than those measured for the Chelyabinsk chondrite, so these specific particles of asteroid regolith are more compacted than the minerals forming the particular LL chondrite associated with PHAs. This might be a natural consequence of particles surviving long exposure times on the surface of a (near-Earth asteroid) NEA. The Double Asteroid Redirection Test (DART) mission plans to excavate a crater in the surface of the (65803) Didymos satellite. Our results suggest that excavating a crater with a kinetic impactor in an area of significant fine-grained regolith will increase the momentum transfer. As this will facilitate the release of particles carrying target mass in the opposite direction to the movement of the projectile, there is no need to grind up the target during the mechanical excavation phase.
Ajuts:	Ministerio de Ciencia e Innovación AYA-PGC2018-097374-B-I00 Ministerio de Economía y Competitividad AYA2015-67175-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-292 European Commission 648454
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Minor planets ; Asteroids: general ; Methods: analytical ; Meteorites ; Meteors ; Meteoroids
Publicat a:	Astronomy & astrophysics, Vol. 629 (September 2019) , art. A119, ISSN 1432-0746

DOI: 10.1051/0004-6361/201935380

5 p, 936.0 KB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Grup de nanoenginyeria de materials, nanomagnetisme i nanomecànica (Gnm3) > SPIN-PORICS
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