{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T12:34:59Z","timestamp":1780490099929,"version":"3.54.1"},"reference-count":30,"publisher":"American Astronomical Society","issue":"3","license":[{"start":{"date-parts":[[2024,3,19]],"date-time":"2024-03-19T00:00:00Z","timestamp":1710806400000},"content-version":"vor","delay-in-days":18,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2024,3,19]],"date-time":"2024-03-19T00:00:00Z","timestamp":1710806400000},"content-version":"tdm","delay-in-days":18,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"funder":[{"DOI":"10.13039\/100000104","name":"National Aeronautics and Space Administration","doi-asserted-by":"crossref","award":["80MSFC20D000"],"award-info":[{"award-number":["80MSFC20D000"]}],"id":[{"id":"10.13039\/100000104","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["Planet. Sci. J."],"published-print":{"date-parts":[[2024,3,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>The Double Asteroid Redirection Test (DART) mission impacted Dimorphos, the satellite of binary near-Earth asteroid (65803) Didymos, on 2022 September 26 UTC. We estimate the changes in the orbital and physical properties of the system due to the impact using ground-based photometric and radar observations, as well as DART camera observations. Under the assumption that Didymos is an oblate spheroid, we estimate that its equatorial and polar radii are 394 \u00b1 11 m and 290 \u00b1 16 m, respectively. We estimate that the DART impact instantaneously changed the along-track velocity of Dimorphos by \u22122.63 \u00b1 0.06 mm s<jats:sup>\u22121<\/jats:sup>. Initially, after the impact, Dimorphos\u2019s orbital period had changed by \u221232.7 minutes \u00b1 16 s to 11.377 \u00b1 0.004 hr. We find that over the subsequent several weeks the orbital period changed by an additional 34 \u00b1 15 s, eventually stabilizing at 11.3674 \u00b1 0.0004 hr. The total change in the orbital period was \u221233.25 minutes \u00b11.5 s. The postimpact orbit exhibits an apsidal precession rate of 6.7 \u00b1 0.\u00b02 day<jats:sup>\u22121<\/jats:sup>. Under our model, this rate is driven by the oblateness parameter of Didymos, <jats:italic>J<\/jats:italic>\n                  <jats:sub>2<\/jats:sub>, as well as the spherical harmonics coefficients, <jats:italic>C<\/jats:italic>\n                  <jats:sub>20<\/jats:sub> and <jats:italic>C<\/jats:italic>\n                  <jats:sub>22<\/jats:sub>, of Dimorphos\u2019s gravity. Under the assumption that Dimorphos is a triaxial ellipsoid with a uniform density, its <jats:italic>C<\/jats:italic>\n                  <jats:sub>20<\/jats:sub> and <jats:italic>C<\/jats:italic>\n                  <jats:sub>22<\/jats:sub> estimates imply axial ratios, <jats:italic>a<\/jats:italic>\/<jats:italic>b<\/jats:italic> and <jats:italic>a<\/jats:italic>\/<jats:italic>c<\/jats:italic>, of about 1.3 and 1.6, respectively. Preimpact images from DART indicate Dimorphos\u2019s shape was close to that of an oblate spheroid, and thus our results indicate that the DART impact significantly altered the shape of Dimorphos.<\/jats:p>","DOI":"10.3847\/psj\/ad26e7","type":"journal-article","created":{"date-parts":[[2024,3,19]],"date-time":"2024-03-19T14:18:35Z","timestamp":1710857915000},"page":"74","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":31,"title":["Orbital and Physical Characterization of Asteroid Dimorphos Following the DART Impact"],"prefix":"10.3847","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4439-7014","authenticated-orcid":true,"given":"Shantanu P.","family":"Naidu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3240-6497","authenticated-orcid":true,"given":"Steven R.","family":"Chesley","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6765-6336","authenticated-orcid":true,"given":"Nicholas","family":"Moskovitz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3091-5757","authenticated-orcid":true,"given":"Cristina","family":"Thomas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8437-1076","authenticated-orcid":true,"given":"Alex J.","family":"Meyer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8434-9776","authenticated-orcid":true,"given":"Petr","family":"Pravec","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8518-9532","authenticated-orcid":true,"given":"Peter","family":"Scheirich","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0774-884X","authenticated-orcid":true,"given":"Davide","family":"Farnocchia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0558-3842","authenticated-orcid":true,"given":"Daniel J.","family":"Scheeres","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-3493-2139","authenticated-orcid":false,"given":"Marina","family":"Brozovic","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7164-9120","authenticated-orcid":false,"given":"Lance A. 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