{"id":37282,"date":"2025-01-30T12:13:10","date_gmt":"2025-01-30T11:13:10","guid":{"rendered":"https:\/\/karmaka.de\/?p=37282"},"modified":"2025-02-03T06:42:33","modified_gmt":"2025-02-03T05:42:33","slug":"low-thermal-inertia-of-162173-ryugu-a-result-of-horizontal-cracks-in-boulders","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=37282","title":{"rendered":"Low thermal inertia of (162173) Ryugu a result of horizontal cracks in boulders<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Maximilian Hamm, Moritz Strau\u00df, Matthias Grott, J\u00f6rg Knollenberg, Robert Luther, Jens Biele, Hiroki Senshu<\/p>\n\n\n\n<p>Icarus<br>Available online 30 January 2025<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0019103525000314\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK + PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p>&#8220;Highlights<\/p>\n\n\n\n<ul>\n<li>We present a thermal model accounting for horizontal fractures on asteroid Ryugu.<\/li>\n\n\n\n<li>The introduction of fractures reduces the observable thermal inertia of the surface.<\/li>\n\n\n\n<li>Results can reconcile conflicting in-situ observations and sample thermal inertia.&#8221;<\/li>\n<\/ul>\n\n\n\n<p class=\"justify-text\">&#8220;Observations of the diurnal variations of the surface temperature of asteroid (162173) Ryugu from orbit and on the surface were performed by the Hayabusa2 spacecraft and MASCOT lander. A low thermal inertia of the boulders on Ryugu was derived from these temperature variations and interpreted as the consequence of high porosity. Samples of Ryugu returned to Earth by Hayabusa2 showed higher thermal inertia when investigated by microscopic thermography. Here, we apply a simple thermal model, considering a horizontal fracture interrupting the heat flow into the surface, and investigate whether the low thermal inertia of Ryugu&#8217;s boulders might be caused by fractures rather than high porosity. We find that the diurnal temperature variations on Ryugu observed by MARA can be partially explained by introducing a single horizontal crack at 9\u202fmm depth below the surface observed by MARA.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Maximilian Hamm, Moritz Strau\u00df, Matthias Grott, J\u00f6rg Knollenberg, Robert Luther, Jens Biele, Hiroki Senshu IcarusAvailable online 30 January 2025 LINK + PDF (OPEN ACCESS) &#8220;Highlights &#8220;Observations of the diurnal variations of the surface temperature of&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,2243,1184],"tags":[3872,1854,1771,2058,2244,6242],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/37282"}],"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=37282"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/37282\/revisions"}],"predecessor-version":[{"id":37299,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/37282\/revisions\/37299"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=37282"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=37282"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=37282"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}