Details

Autor(en) / Beteiligte

• Cheng, Andrew F.
• Agrusa, Harrison F.
• Barbee, Brent W.
• Meyer, Alex J.
• Farnham, Tony L.
• Raducan, Sabina D.
• Richardson, Derek C.
• Dotto, Elisabetta
• Zinzi, Angelo
• Della Corte, Vincenzo
• Statler, Thomas S.
• Chesley, Steven
• Naidu, Shantanu P.
• Hirabayashi, Masatoshi
• Li, Jian-Yang
• Eggl, Siegfried
• Barnouin, Olivier S.
• Chabot, Nancy L.
• Chocron, Sidney
• Collins, Gareth S.
• Daly, R. Terik
• Davison, Thomas M.
• DeCoster, Mallory E.
• Ernst, Carolyn M.
• Ferrari, Fabio
• Graninger, Dawn M.
• Jacobson, Seth A.
• Jutzi, Martin
• Kumamoto, Kathryn M.
• Luther, Robert
• Lyzhoft, Joshua R.
• Michel, Patrick
• Murdoch, Naomi
• Nakano, Ryota
• Palmer, Eric
• Rivkin, Andrew S.
• Scheeres, Daniel J.
• Stickle, Angela M.
• Sunshine, Jessica M.
• Trigo-Rodriguez, Josep M.
• Vincent, Jean-Baptiste
• Walker, James D.
• Wünnemann, Kai
• Zhang, Yun
• Amoroso, Marilena
• Bertini, Ivano
• Brucato, John R.
• Capannolo, Andrea
• Cremonese, Gabriele
• Dall’Ora, Massimo
• Deshapriya, Prasanna J. D.
• Gai, Igor
• Hasselmann, Pedro H.
• Ieva, Simone
• Impresario, Gabriele
• Ivanovski, Stavro L.
• Lavagna, Michèle
• Lucchetti, Alice
• Epifani, Elena M.
• Modenini, Dario
• Pajola, Maurizio
• Palumbo, Pasquale
• Perna, Davide
• Pirrotta, Simone
• Poggiali, Giovanni
• Rossi, Alessandro
• Tortora, Paolo
• Zannoni, Marco
• Zanotti, Giovanni

Titel

Momentum transfer from the DART mission kinetic impact on asteroid Dimorphos

Ist Teil von

• Nature (London), 2023-04, Vol.616 (7957), p.457-460

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2023

Beschreibungen/Notizen

• The NASA Double Asteroid Redirection Test (DART) mission performed a kinetic impact on asteroid Dimorphos, the satellite of the binary asteroid (65803) Didymos, at 23:14 UTC on 26 September 2022 as a planetary defence test 1 . DART was the first hypervelocity impact experiment on an asteroid at size and velocity scales relevant to planetary defence, intended to validate kinetic impact as a means of asteroid deflection. Here we report a determination of the momentum transferred to an asteroid by kinetic impact. On the basis of the change in the binary orbit period 2 , we find an instantaneous reduction in Dimorphos’s along-track orbital velocity component of 2.70 ± 0.10 mm s −1 , indicating enhanced momentum transfer due to recoil from ejecta streams produced by the impact 3 , 4 . For a Dimorphos bulk density range of 1,500 to 3,300 kg m −3 , we find that the expected value of the momentum enhancement factor, β , ranges between 2.2 and 4.9, depending on the mass of Dimorphos. If Dimorphos and Didymos are assumed to have equal densities of 2,400 kg m −3 , β = 3.61 − 0.25 + 0.19 ( 1 σ ) . These β values indicate that substantially more momentum was transferred to Dimorphos from the escaping impact ejecta than was incident with DART. Therefore, the DART kinetic impact was highly effective in deflecting the asteroid Dimorphos. The authors report on a determination of the momentum transferred to an asteroid by kinetic impact, showing that the DART kinetic impact was highly effective in deflecting the asteroid Dimorphos.