{"id":515,"date":"2014-03-19T09:50:55","date_gmt":"2014-03-19T08:50:55","guid":{"rendered":"http:\/\/sophia.estec.esa.int\/gtoc_portal\/?page_id=515"},"modified":"2016-02-19T19:15:33","modified_gmt":"2016-02-19T18:15:33","slug":"next-edition","status":"publish","type":"page","link":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/?page_id=515","title":{"rendered":"GTOC 7 &#8211; Multi-spacecraft exploration of the asteroid belt"},"content":{"rendered":"<p style=\"font-size: 13.63636302947998px; line-height: 21px;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-466\" style=\"font-size: 13.63636302947998px; line-height: 21px;\" src=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/12\/imgres.jpg\" alt=\"imgres\" width=\"110\" height=\"111\" srcset=\"https:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/12\/imgres.jpg 224w, https:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2012\/12\/imgres-150x150.jpg 150w\" sizes=\"auto, (max-width: 110px) 100vw, 110px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-520\" src=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/03\/sapienza_logo-280x300.jpg\" alt=\"sapienza_logo\" width=\"101\" height=\"108\" srcset=\"https:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/03\/sapienza_logo-280x300.jpg 280w, https:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/03\/sapienza_logo.jpg 454w\" sizes=\"auto, (max-width: 101px) 100vw, 101px\" \/><span style=\"font-size: 12pt;\">This edition was organised by Lorenzo Casalino of the Turin Polytechnic and Guido Colasurdo of the\u00a0<a href=\"http:\/\/www.uniroma1.it\/\">Universit\u00e0 di Roma &#8220;Sapienza&#8221;<\/a>. The problem statement was released to the community on the 20th May 2014.<\/span><\/p>\n<h5>In a nutshell<\/h5>\n<p>A mother spacecraft is sent to the main asteroid belt and carries three low-thrust probes that need to be release<span style=\"font-size: 12pt;\">d at appropriate times and gather science on as many asteroid as possibl<\/span>e before returning to the mother spacecraft to deliver their findings.<\/p>\n<ul>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/09\/gtoc7_registered_teams.pdf\">List of registered teams<\/a><\/li>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/09\/gtoc7_problem_description.pdf\">Problem Statement<\/a><\/li>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/09\/gtoc7_asteroids_data.txt\">Problem data<\/a><\/li>\n<li>Requested output file format &#8211; <a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/09\/gtoc7_solution_format_mother.txt\">Mother<\/a>, <a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/09\/gtoc7_solution_format_probe.txt\">Probe<\/a><\/li>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/wp-content\/uploads\/2014\/09\/gtoc7_ranks.pdf\">Final rankings<\/a><\/li>\n<li><a href=\"http:\/\/areeweb.polito.it\/gtoc\/\">Web site\u00a0from the organizers<\/a><\/li>\n<li><a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/?page_id=575\">Solution methods<\/a><\/li>\n<li>Workshop in Rome (March 2015) &#8211; <a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/?page_id=707\">Presentations<\/a><\/li>\n<\/ul>\n<h5>The Winners<\/h5>\n<p>Led by Anastassios Petropoulos, the team from Jet Propulsion Laboratory (JPL) won this edition. For the first time the same team gets the third victory in a GTOC.<\/p>\n<h5>The\u00a0Workshop<\/h5>\n<p>The GTOC7 workshop was\u00a0 held in Rome on Friday March 6, 2015. &#8211; <a href=\"http:\/\/sophia.estec.esa.int\/gtoc_portal\/?page_id=707\">Presentations<\/a><\/p>\n<h5>Curiosities<\/h5>\n<p>The longest single asteroid sequence valid for a probe and found during the competition had length 14.<\/p>\n<p>It is debated if a sequence\u00a0of length 15 exists.<\/p>\n<p>A very\u00a0competitive solution was found by JPL using an Ant Colony Optimization approach. Eventually a different\u00a0solution turned out to be better and was thus submitted.<\/p>\n<p>The winning solution from JPL is\u00a0visualized below:<\/p>\n<p><iframe loading=\"lazy\" title=\"NASA \/ JPL winning solution to the GTOC7 problem\" width=\"660\" height=\"371\" src=\"https:\/\/www.youtube.com\/embed\/bXTebp6rLFk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>After an initial phase where all possible target asteroids are shown, only the ones that are visited by one of the daughters remain. The Earth orbit is visualized in blue, the mother spacecarft in purple and each one of the daughter as a cross of the same color as the asetroid it will visit.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This edition was organised by Lorenzo Casalino of the Turin Polytechnic and Guido Colasurdo of the\u00a0Universit\u00e0 di Roma &#8220;Sapienza&#8221;. The problem statement was released to the community on the 20th May 2014. In a nutshell A mother spacecraft is sent to the main asteroid belt and carries three low-thrust probes that need to be released &hellip; <a href=\"https:\/\/sophia.estec.esa.int\/gtoc_portal\/?page_id=515\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">GTOC 7 &#8211; Multi-spacecraft exploration of the asteroid belt<\/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-515","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=\/wp\/v2\/pages\/515","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=515"}],"version-history":[{"count":33,"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=\/wp\/v2\/pages\/515\/revisions"}],"predecessor-version":[{"id":793,"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=\/wp\/v2\/pages\/515\/revisions\/793"}],"wp:attachment":[{"href":"https:\/\/sophia.estec.esa.int\/gtoc_portal\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}