학술논문
Light Curves and Colors of the Ejecta from Dimorphos after the DART Impact
Document Type
Working Paper
Author
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; 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.; Transom, Ian M.
Source
Subject
Language
Abstract
On 26 September 2022 the Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, a satellite of the asteroid 65803 Didymos. 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 ~8.8 - 17.2 minutes. Here we report optical observations of Dimorphos before, during and after the impact, from a network of citizen science telescopes across the world. We find a maximum brightening of 2.29 $\pm$ 0.14 mag upon impact. Didymos fades back to its pre-impact brightness over the course of 23.7 $\pm$ 0.7 days. We estimate lower limits on the mass contained in the ejecta, which was 0.3 - 0.5% Dimorphos' mass depending on the dust size. We also observe a reddening of the ejecta upon impact.
Comment: Accepted by Nature
Comment: Accepted by Nature