{"id":23,"date":"2012-11-13T18:44:26","date_gmt":"2012-11-13T18:44:26","guid":{"rendered":"http:\/\/sophia.estec.esa.int\/gtoc_portal\/?page_id=23"},"modified":"2014-11-24T15:53:57","modified_gmt":"2014-11-24T14:53:57","slug":"gtoc-4","status":"publish","type":"page","link":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/?page_id=23","title":{"rendered":"GTOC 4 &#8211; Asteroids billiard"},"content":{"rendered":"<p><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/12\/cnes-pyramid2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright  wp-image-468\" title=\"cnes-logo\" src=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/12\/cnes-pyramid2-150x150.jpg\" alt=\"\" width=\"100\" height=\"100\" srcset=\"https:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/12\/cnes-pyramid2-150x150.jpg 150w, https:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/12\/cnes-pyramid2-300x300.jpg 300w, https:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/12\/cnes-pyramid2.jpg 430w\" sizes=\"auto, (max-width: 100px) 100vw, 100px\" \/><\/a>This edition was organised by Bertrand Regis of the Centre National d\u2019Etudes Spatiales. The problem statement was released to the community on the 2nd of March 2009.<\/p>\n<h5>In a nutshell<\/h5>\n<p>A spacecraft has to visit as many Near Earth Asteroids as possible by performing fast consecutive fly-bys to finally randezvous with a NEA. The objective function is the number of asteroid visited. Secondary performance indices, to break ties, are the final spacecraft mass and total time of flight.<\/p>\n<ul>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/11\/gtoc4_registered_teams.pdf\">List of registered teams\u00a0<\/a><\/li>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/11\/gtoc4_problem_description.pdf\">Problem statement<\/a><\/li>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/11\/gtoc4_problem_data.txt\">Problem data<\/a><\/li>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/11\/gtoc4_solution_format.txt\">Requested output file format<\/a><\/li>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/11\/ACT-RPT-MAD-GTOC4-ranks.pdf\">Final rankings<\/a><\/li>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/11\/gtoc4_summary_of_results.pdf\">Summary of the results<\/a><\/li>\n<li><a href=\"https:\/\/web.archive.org\/web\/20100916063356\/http:\/\/cct.cnes.fr\/cct02\/gtoc4\/index.htm\">Original Web site<\/a>\u00a0(from the web archives)<\/li>\n<li><a href=\"http:\/\/www.esa.int\/Our_Activities\/Operations\/Global_Trajectory_Optimisation_Competition\">Announecment on ESA portal<\/a><\/li>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/11\/MAD_GTOC4_workshop.jpeg\">Group Picture<\/a><\/li>\n<\/ul>\n<h5>The Winners<\/h5>\n<p>Led by Ilia S. Grigoriev, this edition was won by the team from Moscow State University with a trajectory visiting 44 asteroids in less than ten years.<\/p>\n<h5>Curiosities<\/h5>\n<p>Scientists would not agree, before this edition of GTOC, on how many asteroids could be encountered during a low-thrust interplanetary mission. The number 44 (in 10 years) appeared to scientific community as a positive surprise.<\/p>\n<p>The second ranked trajectory, from the Aerospace Corporation, also visited 44 asteroid but had its secondary objective (mass) lower.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This edition was organised by Bertrand Regis of the Centre National d\u2019Etudes Spatiales. The problem statement was released to the community on the 2nd of March 2009. In a nutshell A spacecraft has to visit as many Near Earth Asteroids as possible by performing fast consecutive fly-bys to finally randezvous with a NEA. The objective &hellip; <a href=\"https:\/\/sophia.estec.esa.int\/gtoc_portal\/?page_id=23\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">GTOC 4 &#8211; Asteroids billiard<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-23","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=\/wp\/v2\/pages\/23","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23"}],"version-history":[{"count":26,"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=\/wp\/v2\/pages\/23\/revisions"}],"predecessor-version":[{"id":692,"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=\/wp\/v2\/pages\/23\/revisions\/692"}],"wp:attachment":[{"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}