Light curves and colours of the ejecta from Dimorphos after the DART impact
Author:
Graykowski ArielORCID, Lambert Ryan A.ORCID, Marchis FranckORCID, Cazeneuve Dorian, Dalba Paul A.ORCID, Esposito Thomas M.ORCID, O’Conner Peluso Daniel, Sgro Lauren A., Blaclard Guillaume, Borot Antonin, Malvache Arnaud, Marfisi LaurentORCID, Powell Tyler M.ORCID, Huet PatriceORCID, Limagne MatthieuORCID, Payet Bruno, Clarke Colin, Murabana Susan, Owen Daniel Chu, Wasilwa RonaldORCID, Fukui Keiichi, Goto Tateki, Guillet BrunoORCID, Huth PatrickORCID, Ishiyama SatoshiORCID, Kukita RyuichiORCID, Mitchell Mike, Primm MichaelORCID, Randolph JustusORCID, Rivett Darren A., Ryno MatthewORCID, Shimizu Masao, Toullec Jean-PierreORCID, Will StefanORCID, Yue Wai-Chun, Camilleri Michael, Graykowski Kathy, Janetzke RonORCID, Janke Des, Kardel Scott, Loose MargaretORCID, Pickering John W.ORCID, Smith Barton A., Transom Ian M.ORCID
Abstract
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.
Publisher
Springer Science and Business Media LLC
Subject
Multidisciplinary
Cited by
25 articles.
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