LINK<\/strong><\/a><\/p>\n\n\n\n“The Aguas Zarcas (Costa Rica) CM2 carbonaceous chondrite fell during nighttime in April 2019. Security and dashboard camera videos of the meteor were analyzed to provide a trajectory, light curve, and orbit of the meteoroid. The trajectory was near vertical, 81\u00b0 steep, arriving from an ~109\u00b0 (WNW) direction with an apparent entry speed of 14.6\u2009\u00b1\u20090.6\u2009km\u2009s\u22121. The meteoroid penetrated to ~25\u2009km altitude (5\u2009MPa dynamic pressure), where the surviving mass shattered, producing a flare that was detected by the Geostationary Lightning Mappers on GOES-16 and GOES-17. The cosmogenic radionuclides were analyzed in three recovered meteorites by either gamma-ray spectroscopy or accelerator mass spectrometry (AMS), while noble gas concentrations and isotopic compositions were measured in the same fragment that was analyzed by AMS. From this, the pre-atmospheric size of the meteoroid and its cosmic ray exposure age were determined. The studied samples came from a few cm up to 30\u2009cm deep in an object with an original diameter of ~60\u2009cm that was ejected from its parent body 2.0\u2009\u00b1\u20090.2\u2009Ma ago. The ejected material had an argon retention age of 2.9\u2009Ga. The object was delivered most likely by the 3:1 or 5:2 mean motion resonances and, without subsequent fragmentation, approached the Earth from a low i\u2009<\u20092.8\u00b0 inclined orbit with a perihelion distance q\u2009=\u20090.98\u2009AU close to the Earth’s orbit. The steep entry trajectory and high strength resulted in deep penetration in the atmosphere and a relatively large fraction of surviving mass.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Peter Jenniskens, Gerardo J. Soto, Gabriel Goncalves Silva, Oscar L\u00fccke, Pilar Madrigal, Tatiana Ballestero, Carolina Salas Matamoros, Paulo Ruiz Cubillo, Daniela Cardozo Mourao, Othon Cabo Winter, Rafael Sfair, Clemens E. Tillier, Jim Albers, Laurence A….<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5001,9,18,69,96,47],"tags":[4965,3273,105,1849,4612,3518,2212,216,1832],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38007"}],"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=38007"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38007\/revisions"}],"predecessor-version":[{"id":38008,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38007\/revisions\/38008"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=38007"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=38007"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=38007"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}