{"id":36351,"date":"2024-06-23T11:59:41","date_gmt":"2024-06-23T09:59:41","guid":{"rendered":"https:\/\/karmaka.de\/?p=36351"},"modified":"2024-06-23T12:02:45","modified_gmt":"2024-06-23T10:02:45","slug":"past-orbital-evolution-and-its-effects-on-the-surface-of-162173-ryugu","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=36351","title":{"rendered":"Past orbital evolution and its effects on the surface of (162173) Ryugu<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>M C Guimar\u00e3es; RAN Araujo, O C Winter<\/p>\n\n\n\n<p>Monthly Notices of the Royal Astronomical Society, stae1494<br>Published: 17 June 2024<\/p>\n\n\n\n<p><a href=\"https:\/\/academic.oup.com\/mnras\/advance-article\/doi\/10.1093\/mnras\/stae1494\/7695297\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The Japanese probe Hayabusa 2 recently visited the NEA (162173) Ryugu. This mission provided valuable information about the asteroid, including in situ images and a surface sample brought back to Earth. The data suggests that Ryugu has likely been affected by space weathering, but the underlying cause of the surface modification remains unclear. This paper aims to shed light on the problem by providing new information about the possible past orbital path of Ryugu. We used a procedure to estimate how Ryugu has dynamically evolved since it entered the NEAs\u2019 region and whether this can explain the observed data. We have conducted numerical integrations of the N-body gravitational problem. The system comprises the Sun, the solar system\u2019s eight planets, and a group of 29, 000 test particles initially placed in the main asteroidal belt (MAB) near the \u03bd6 secular resonance. We then tracked the particles that left the MAB and eventually arrived close to Ryugu\u2019s current orbit. Our analysis showed that out of 307 clones of Ryugu, only 3 came very close to the Sun at a distance of less than 0.1 au. Consequently, it is unlikely that Ryugu has undergone significant surface temperature variations. We also computed that ~ 70% of the clones have spent more than 5 Myr at an equivalent distance of 1 au from the Sun. This result suggests that Ryugu has been exposed to significant amounts of solar radiation over a long period, which may have resulted in space weathering effects on its surface.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>M C Guimar\u00e3es; RAN Araujo, O C Winter Monthly Notices of the Royal Astronomical Society, stae1494Published: 17 June 2024 LINK (OPEN ACCESS) &#8220;The Japanese probe Hayabusa 2 recently visited the NEA (162173) Ryugu. This mission&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,2243,3504],"tags":[3872,2244,673],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36351"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=36351"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36351\/revisions"}],"predecessor-version":[{"id":36353,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36351\/revisions\/36353"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=36351"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=36351"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=36351"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}