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Asteroid Impact & Deflection Assessment mission: Kinetic impactor

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    0461429 - ASU-R 2017 RIV US eng J - Journal Article
    Cheng, A.F. - Michel, R. - Jutzi, M. - Rivkin, A. S. - Stickle, A. - Barnouin, O. - Ernst, C. - Atchison, J. - Pravec, Petr - Richardson, D.C.
    Asteroid Impact & Deflection Assessment mission: Kinetic impactor.
    Planetary and Space Science. Roč. 121, February (2016), s. 25-37. ISSN 0032-0633
    Institutional support: RVO:67985815
    Keywords : planetary defense * near-Earth asteroids * asteroid impact hazards
    Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
    Impact factor: 1.892, year: 2016

    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.
    Permanent Link: http://hdl.handle.net/11104/0261023