UV to near-IR obser vãtions of the DART-Dimorphos collision

Eran O. Ofek, Doron Kushnir, David Polishook, Eli Waxman, Aaron Tohuvavohu, Sagi Ben-Ami, Boaz Katz, Orly Gnat, Nora L. Strotjohann, Enrico Segre, Arie Blumenzweig, Yahel Sofer-Rimalt, Ofer Yaron, Avishay Gal-Yam, Yossi Shvartzvald, Michael Engel, S. Bradley Cenko, Ofir Hershko

Research output: Contribution to journalArticlepeer-review


The impact of the Double Asteroid Redirection Test (DART) spacecraft with Dimorphosãllows us to studyãsteroid collision physics, including momentum transfer, the ejecta properties,ãnd the visibility of such events in the Solar system. We report observations of the DART impact in the ultraviolet (UV), visible light,ãnd near -infrared (IR) wa velengths. The observations support the existence ofãt least two separate components of the ejecta:ã fastãndã slow component. The fast-ejecta component is composed ofã gaseous phase, movingãtãbout 1.6 km s -1 withã mass of ≲10 4 kg. The fast ejecta is detected in the UVãnd visible light, but not in the near-IR z-band observations. Fittingã simplified optical thickness model to these observationsãllows us to constrain some of the properties of the fast ejecta, including its scattering efficiencyãnd the opacity of the gas. The slow ejecta component is movingãt typical velocities of up toãbout 10 m s -1 . It is composed of micrometer-size particles, that haveã scattering efficiency,ãt the direction of the observer, of the order of 10 -3ãndã total mass of ∼10 6 kg. The larger particles in the slow ejecta, whose size is bound to be in the range between ∼1 mmãnd ∼1 m, likely haveã scattering efficiency larger than that of the pre-impact Didymos system.

Original languageEnglish
Pages (from-to)10507-10521
Number of pages15
Issue number4
Early online date6 Dec 2023
StatePublished - 1 Feb 2024


  • minor planets: individual: Didymos
  • minor planets: individual: Dimorphos

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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