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Asteroid Impact & Deflection Assessment mission: Kinetic impactor
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SYSNO ASEP 0461429 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Asteroid Impact & Deflection Assessment mission: Kinetic impactor Author(s) Cheng, A.F. (AE)
Michel, R. (FR)
Jutzi, M. (CH)
Rivkin, A. S. (US)
Stickle, A. (US)
Barnouin, O. (US)
Ernst, C. (US)
Atchison, J. (US)
Pravec, Petr (ASU-R) RID, ORCID
Richardson, D.C. (US)Source Title Planetary and Space Science. - : Elsevier - ISSN 0032-0633
Roč. 121, February (2016), s. 25-37Number of pages 9 s. Publication form Print - P Language eng - English Country US - United States Keywords planetary defense ; near-Earth asteroids ; asteroid impact hazards Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics Institutional support ASU-R - RVO:67985815 UT WOS 000370459600004 EID SCOPUS 84954271186 DOI 10.1016/j.pss.2015.12.004 Annotation The Asteroid Impact & Deflection Assessment (AIDA) mission will be the first space experiment to demonstrate asteroid impact hazard mitigation by using a kinetic impactor to deflect an asteroid. The primary goals of AIDA are (i) to test our ability to perform a spacecraft impact on a potentially hazardous near-Earth asteroid and (ii) to measure and characterize the deflection caused by the impact. The AIDA target will be the binary near-Earth asteroid (65803) Didymos, with the deflection experiment to occur in late September, 2022. The DART impact on the secondary member of the binary at similar to 7 km/s is expected to alter the binary orbit period by about 4 minutes, assuming a simple transfer of momentum to the target, and this period change will be measured by Earth-based observatories. The AIM spacecraft will characterize the asteroid target and monitor results of the impact in situ at Didymos. The DART mission is a full-scale kinetic impact to deflect a 150 m diameter asteroid, with known impactor conditions and with target physical properties characterized by the AIM mission. Predictions for the momentum transfer efficiency of kinetic impacts are given for several possible target types of different porosities, using Housen and Holsapple (2011) crater scaling model for impact ejecta mass and velocity distributions. Results are compared to numerical simulation results using the Smoothed Particle Hydrodynamics code of Jutzi and Michel (2014) with good agreement. The model also predicts that the ejecta from the DART impact may make Didymos into an active asteroid, forming an ejecta coma that may be observable from Earth-based telescopes. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2017
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