Surface Ages for the Sample Return Asteroids Bennu, Ryugu, and Itokawa
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10511181" target="_blank" >RIV/00216208:11320/25:10511181 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=36Z3289JVH" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=36Z3289JVH</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/PSJ/add46a" target="_blank" >10.3847/PSJ/add46a</a>
Alternative languages
Result language
angličtina
Original language name
Surface Ages for the Sample Return Asteroids Bennu, Ryugu, and Itokawa
Original language description
The OSIRIS-REx, Hayabusa2, and Hayabusa missions have returned samples from three near-Earth asteroids (NEAs), namely Bennu, Ryugu, and Itokawa, respectively. Insights into the geological and dynamical history of these NEAs can be gleaned by linking their surface ages, derived by modeling the production of their crater size-frequency distributions, to the cosmic-ray exposure (CRE) ages of their samples. The complication is that as these NEAs traveled from the main belt to their observed orbits, the impactor flux striking them from main-belt asteroids, Mars-crossing asteroids, and NEAs also changed. Here we account for these factors by allowing Bennu, Ryugu, and Itokawa to dynamically evolve within a crater production model. Each world was tracked over many tens of different orbital pathways. Crater erasure effects, produced by superposed craters, sandblasting effects, and the impact-driven mass movement of surface materials, were also included, with the latter parameterized using a crater damage function. Surface ages were determined by comparing model crater size-frequency distributions to the observed ones. Our results yielded median surface age values for Bennu, Ryugu, and Itokawa of 7.7, 4.1, and 3.2 Myr old, respectively. These model ages are broadly consistent with the CRE ages measured from the returned samples. We suggest that these model ages may represent the timing of global resurfacing events, with the most likely mechanisms being shattering impacts from main-belt projectiles and YORP-driven spin up. When combined with cratering events, we predict that near-surface materials on Bennu, Ryugu, and Itokawa have experienced considerable churn with time.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA25-16507S" target="_blank" >GA25-16507S: Early dynamics of planets and analysis of asteroid populations</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
The Planetary Science Journal
ISSN
2632-3338
e-ISSN
2632-3338
Volume of the periodical
6
Issue of the periodical within the volume
6
Country of publishing house
US - UNITED STATES
Number of pages
33
Pages from-to
150
UT code for WoS article
001520244900001
EID of the result in the Scopus database
2-s2.0-105009763569