Using a discrete element method to investigate seismic response and spin change of 99942 Apophis during its 2029 tidal encounter with Earth

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00521592" target="_blank" >RIV/67985815:_____/19:00521592 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.icarus.2019.03.015" target="_blank" >https://doi.org/10.1016/j.icarus.2019.03.015</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.icarus.2019.03.015" target="_blank" >10.1016/j.icarus.2019.03.015</a>

Result language
angličtina
Original language name
Using a discrete element method to investigate seismic response and spin change of 99942 Apophis during its 2029 tidal encounter with Earth
Original language description
We represent Earth as a single rigid sphere and the target body as a cohesionless, self-gravitating granular aggregate of identical spheres in a hexagonal-close-packed configuration subject only to gravitational and soft-sphere (elastic) contact forces. We use a radar-derived shape model for the asteroid, along with current best estimates for the orbital solution of Apophis to simulate the encounter trajectory, and perform a large parameter sweep over different potential encounter orientations and bulk densities for the body. We find that the median change in the rotational period for Apophis, sampled for a range of different initial body and spin orientations, is -1.9 h (mean -0.1 +/- 6.0 (1-sigma) hours) during the encounter. Additionally, we measure that the mean of the largest change in axis length among the 3 primary body axes, also sampled over trials with different initial body and spin orientations, is 0.132 +/- 0.066 mm during the encounter, assuming a bulk Young's Modulus of 10(6) Pa. Such strains on the timescale of peak stress during the encounter may be large enough to be detected by an in-situ seismometer.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
<a href="/en/project/GA17-00774S" target="_blank" >GA17-00774S: Physical properties and evolutionary processes of sub-kilometer asteroids</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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