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Physical properties of asteroid Dimorphos as derived from the DART impact

Λεπτομέρειες βιβλιογραφικής εγγραφής
Τίτλος: Physical properties of asteroid Dimorphos as derived from the DART impact
Συγγραφείς: Raducan, S, Jutzi, M, Cheng, AF, Zhang, Y, Barnouin, O, Collins, G, Daly, RT, Davison, T, Ernst, CM, Farnham, TL, Ferrari, F, Hirabayashi, M, Kumamoto, KM, Michel, P, Murdoch, N, Nakano, R, Pajola, M, Rossi, A, Agrusa, HF, Barbee, BW, Bruck Syal, M, Chabot, NL, Dotto, E, Fahnestock, EG, Hasselmann, PH, Herreros, I, Ivanovski, S, Li, J-Y, Lucchetti, A, Luther, R, Ormo, J, Owen, M, Pravec, P, Rivkin, AS, Robin, CQ, Sanchez, P, Tusberti, F, Wunnemann, K, Zinzi, A, Mazzotta Epifani, E, Manzoni, C, May, BH
Πηγή: 455 ; 445
Στοιχεία εκδότη: Springer Nature
Έτος έκδοσης: 2024
Συλλογή: Imperial College London: Spiral
Περιγραφή: On 26 September 2022, NASA’s Double Asteroid Redirection Test (DART) mission successfully impacted Dimorphos, the natural satellite of the binary near-Earth asteroid (65803) Didymos. Numerical simulations of the impact provide a means to find the surface material properties and structures of the target that are consistent with the observed momentum deflection efficiency, ejecta cone geometry and ejected mass. Our simulation that best matches the observations indicates that Dimorphos is weak, with a cohesive strength of less than a few pascals, like asteroids (162173) Ryugu and (101955) Bennu. We find that the bulk density of Dimorphos ρB is lower than ~2,400 kg m−3 and that it has a low volume fraction of boulders (≲40 vol%) on the surface and in the shallow subsurface, which are consistent with data measured by the DART experiment. These findings suggest that Dimorphos is a rubble pile that might have formed through rotational mass shedding and reaccumulation from Didymos. Our simulations indicate that the DART impact caused global deformation and resurfacing of Dimorphos. ESA’s upcoming Hera mission may find a reshaped asteroid rather than a well-defined crater.
Τύπος εγγράφου: article in journal/newspaper
Γλώσσα: unknown
Relation: Nature Astronomy; http://hdl.handle.net/10044/1/108826
DOI: 10.1038/s41550-024-02200-3
Διαθεσιμότητα: http://hdl.handle.net/10044/1/108826
https://doi.org/10.1038/s41550-024-02200-3
Rights: © The Author(s) 2024. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. ; http://creativecommons.org/licenses/by/4.0/
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  Data: On 26 September 2022, NASA’s Double Asteroid Redirection Test (DART) mission successfully impacted Dimorphos, the natural satellite of the binary near-Earth asteroid (65803) Didymos. Numerical simulations of the impact provide a means to find the surface material properties and structures of the target that are consistent with the observed momentum deflection efficiency, ejecta cone geometry and ejected mass. Our simulation that best matches the observations indicates that Dimorphos is weak, with a cohesive strength of less than a few pascals, like asteroids (162173) Ryugu and (101955) Bennu. We find that the bulk density of Dimorphos ρB is lower than ~2,400 kg m−3 and that it has a low volume fraction of boulders (≲40 vol%) on the surface and in the shallow subsurface, which are consistent with data measured by the DART experiment. These findings suggest that Dimorphos is a rubble pile that might have formed through rotational mass shedding and reaccumulation from Didymos. Our simulations indicate that the DART impact caused global deformation and resurfacing of Dimorphos. ESA’s upcoming Hera mission may find a reshaped asteroid rather than a well-defined crater.
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  Data: © The Author(s) 2024. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. ; http://creativecommons.org/licenses/by/4.0/
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