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000006880 005__ 20240306141839.0
000006880 0247_ $$2DOI$$a10.3847/PSJ/ad16e6
000006880 037__ $$aSCART-2024-0118
000006880 100__ $$aChabot, N. L.
000006880 245__ $$aAchievement of the Planetary Defense Investigations of the Double Asteroid Redirection Test (DART) Mission
000006880 260__ $$c2024
000006880 520__ $$aNASA's Double Asteroid Redirection Test (DART) mission was the first to demonstrate asteroid deflection, and the mission's Level 1 requirements guided its planetary defense investigations. Here, we summarize DART's achievement of those requirements. On 2022 September 26, the DART spacecraft impacted Dimorphos, the secondary member of the Didymos near-Earth asteroid binary system, demonstrating an autonomously navigated kinetic impact into an asteroid with limited prior knowledge for planetary defense. Months of subsequent Earth-based observations showed that the binary orbital period was changed by –33.24 minutes, with two independent analysis methods each reporting a 1σ uncertainty of 1.4 s. Dynamical models determined that the momentum enhancement factor, β, resulting from DART's kinetic impact test is between 2.4 and 4.9, depending on the mass of Dimorphos, which remains the largest source of uncertainty. Over five dozen telescopes across the globe and in space, along with the Light Italian CubeSat for Imaging of Asteroids, have contributed to DART's investigations. These combined investigations have addressed topics related to the ejecta, dynamics, impact event, and properties of both asteroids in the binary system. A year following DART's successful impact into Dimorphos, the mission has achieved its planetary defense requirements, although work to further understand DART's kinetic impact test and the Didymos system will continue. In particular, ESA's Hera mission is planned to perform extensive measurements in 2027 during its rendezvous with the Didymos–Dimorphos system, building on DART to advance our knowledge and continue the ongoing international collaboration for planetary defense.
000006880 594__ $$aNO
000006880 700__ $$aRivkin, A. S.
000006880 700__ $$aCheng, A. F.
000006880 700__ $$aBarnouin, O. S.
000006880 700__ $$aFahnestock, E. G.
000006880 700__ $$aRichardson, D. C.
000006880 700__ $$aStickle, A. M.
000006880 700__ $$aKaratekin, O. ...
000006880 700__ $$aSenel, C. B. ...
000006880 700__ $$aWünnemann, K.
000006880 700__ $$aZannoni, M.
000006880 700__ $$aZhang, Y.
000006880 773__ $$c49$$n2$$pThe Planetary Science Journal$$v5$$y2024
000006880 8560_ $$fcem.senel@ksb-orb.be
000006880 8564_ $$s1987684$$uhttp://publi2-as.oma.be/record/6880/files/Chabot_2024_Planet._Sci._J._5_49.pdf
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000006880 905__ $$apublished in
000006880 980__ $$aREFERD