Photometry of the Didymos System across the DART Impact Apparition

Nicholas Moskovitz, Cristina Thomas, Petr Pravec, Tim Lister, Tom Polakis, David Osip, Theodore Kareta, Agata Rożek, Steven R. Chesley, Shantanu P. Naidu, Peter Scheirich, William Ryan, Eileen Ryan, Brian Skiff, Colin Snodgrass, Matthew M. Knight, Andrew S. Rivkin, Nancy L. Chabot, Vova Ayvazian, Irina BelskayaZouhair Benkhaldoun, Daniel N. Berteşteanu, Mariangela Bonavita, Terrence H. Bressi, Melissa J. Brucker, Martin J. Burgdorf, Otabek Burkhonov, Brian Burt, Carlos Contreras, Joseph Chatelain, Young Jun Choi, Matthew Daily, Julia de León, Kamoliddin Ergashev, Tony Farnham, Petr Fatka, Marin Ferrais, Stefan Geier, Edward Gomez, Sarah Greenstreet, Hannes Gröller, Carl Hergenrother, Carrie Holt, Kamil Hornoch, Marek Husárik, Raguli Inasaridze, Emmanuel Jehin, Elahe Khalouei, Jean Baptiste Kikwaya Eluo, Myung Jin Kim, Yurij Krugly, Hana Kučáková, Peter Kušnirák, Jeffrey A. Larsen, Hee Jae Lee, Cassandra Lejoly, Javier Licandro, Penélope Longa-Peña, Ronald A. Mastaler, Curtis McCully, Hong Kyu Moon, Nidia Morrell, Arushi Nath, Dagmara Oszkiewicz, Daniel Parrott, Liz Phillips, Marcel M. Popescu, Donald Pray, George Pantelimon Prodan, Markus Rabus, Michael T. Read, Inna Reva, Vernon Roark, Toni Santana-Ros, James V. Scotti, Taiyo Tatara, Audrey Thirouin, David Tholen, Volodymyr Troianskyi, Andrew F. Tubbiolo, Katelyn Villa

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


On 2022 September 26, the Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, the satellite of binary near-Earth asteroid (65803) Didymos. This demonstrated the efficacy of a kinetic impactor for planetary defense by changing the orbital period of Dimorphos by 33 minutes. Measuring the period change relied heavily on a coordinated campaign of lightcurve photometry designed to detect mutual events (occultations and eclipses) as a direct probe of the satellite’s orbital period. A total of 28 telescopes contributed 224 individual lightcurves during the impact apparition from 2022 July to 2023 February. We focus here on decomposable lightcurves, i.e., those from which mutual events could be extracted. We describe our process of lightcurve decomposition and use that to release the full data set for future analysis. We leverage these data to place constraints on the postimpact evolution of ejecta. The measured depths of mutual events relative to models showed that the ejecta became optically thin within the first ∼1 day after impact and then faded with a decay time of about 25 days. The bulk magnitude of the system showed that ejecta no longer contributed measurable brightness enhancement after about 20 days postimpact. This bulk photometric behavior was not well represented by an HG photometric model. An HG1G2 model did fit the data well across a wide range of phase angles. Lastly, we note the presence of an ejecta tail through at least 2023 March. Its persistence implied ongoing escape of ejecta from the system many months after DART impact.

Original languageEnglish (US)
Article number35
JournalPlanetary Science Journal
Issue number2
StatePublished - Feb 1 2024

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science


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