Light curves and colours of the ejecta from Dimorphos after the DART impact

Article

Graykowski, Ariel, Lambert, Ryan A., Marchis, Franck, Cazeneuve, Dorian, Dalba, Paul A., Esposito, Thomas M., Peluso, Daniel O’Conner, Sgro, Lauren A., Blaclard, Guillaume, Borot, Antonin, Malvache, Arnaud, Marfisi, Laurent, Powell, Tyler M., Huet, Patrice, Limagne, Matthieu, Payet, Bruno, Clarke, Colin, Murabana, Susan, Owen, Daniel Chu, ..., Transom, Ian M.. 2023. "Light curves and colours of the ejecta from Dimorphos after the DART impact." Nature. 616, pp. 461-464. https://doi.org/10.1038/s41586-023-05852-9
Article Title

Light curves and colours of the ejecta from Dimorphos after the DART impact

ERA Journal ID17479
Article CategoryArticle
AuthorsGraykowski, Ariel, Lambert, Ryan A., Marchis, Franck, Cazeneuve, Dorian, Dalba, Paul A., Esposito, Thomas M., Peluso, Daniel O’Conner, Sgro, Lauren A., Blaclard, Guillaume, Borot, Antonin, Malvache, Arnaud, Marfisi, Laurent, Powell, Tyler M., Huet, Patrice, Limagne, Matthieu, Payet, Bruno, Clarke, Colin, Murabana, Susan, Owen, Daniel Chu, Wasilwa, Ronald, Fukui, Keiichi, Goto, Tateki, Guillet, Bruno, Huth, Patrick, Ishiyama, Satoshi, Kukita, Ryuichi, Mitchell, Mike, Primm, Michael, Randolph, Justus, Rivett, Darren A., Ryno, Matthew, Shimizu, Masao, Toullec, Jean-Pierre, Will, Stefan, Yue, Wai-Chun, Camilleri, Michael, Graykowski, Kathy, Janetzke, Ron, Janke, Des, Kardel, Scott, Loose, Margaret, Pickering, John W., Smith, Barton A. and Transom, Ian M.
Journal TitleNature
Journal Citation616, pp. 461-464
Number of Pages8
Year2023
PublisherNature Publishing Group
Place of PublicationUnited Kingdom
ISSN0028-0836
0090-0028
0300-8746
1476-4687
Digital Object Identifier (DOI)https://doi.org/10.1038/s41586-023-05852-9
Web Address (URL)https://www.nature.com/articles/s41586-023-05852-9
AbstractOn 26 September 2022, the Double Asteroid Redirection Test (DART) spacecraft struck Dimorphos, a satellite of the asteroid 65803 Didymos1. Because it is a binary system, it is possible to determine how much the orbit of the satellite changed, as part of a test of what is necessary to deflect an asteroid that might threaten Earth with an impact. In nominal cases, pre-impact predictions of the orbital period reduction ranged from roughly 8.8 to 17 min (refs. 2,3). Here we report optical observations of Dimorphos before, during and after the impact, from a network of citizen scientists’ telescopes across the world. We find a maximum brightening of 2.29 ± 0.14 mag on impact. Didymos fades back to its pre-impact brightness over the course of 23.7 ± 0.7 days. We estimate lower limits on the mass contained in the ejecta, which was 0.3–0.5% Dimorphos’s mass depending on the dust size. We also observe a reddening of the ejecta on impact.
KeywordsDimorphos; DART impact; Double Asteroid Redirection Test
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 20205101. Astronomical sciences
Byline AffiliationsSETI Institute, United States
Unistellar, France
University of California Santa Cruz, United States
University of California Berkeley, United States
Centre for Astrophysics
University of California Los Angeles, United States
Unistellar Citizen Scientists
Armagh Observatory and Planetarium, United Kingdom
Travelling Telescope, Kenya
Community College of Allegheny County, United States
University of Otago, New Zealand
Christchurch Hospital, New Zealand
Hamilton Astronomical Society Observatory, New Zealand
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