{"id":10142,"date":"2019-01-20T06:07:36","date_gmt":"2019-01-20T06:07:36","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=10142"},"modified":"2019-02-04T17:43:02","modified_gmt":"2019-02-04T17:43:02","slug":"a-t-on-definitivement-perdu-le-rover-martien-opportunity","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/01\/20\/a-t-on-definitivement-perdu-le-rover-martien-opportunity\/","title":{"rendered":"A-t-on d\u00e9finitivement perdu le rover martien Opportunity ?"},"content":{"rendered":"<p><strong>Sur Mars le rover Opportunity n\u2019a plus donn\u00e9 signe de vie depuis l\u2019\u00e9t\u00e9 dernier, mais la NASA esp\u00e8re encore renouer le contact.<\/strong><\/p>\n<p>Lorsque Opportunity a atterri dans la r\u00e9gion de <em>Meridiani Planum<\/em> sur la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/02\/16\/mars-express-survole-pole-nord-de-planete-rouge\/\" target=\"_blank\" rel=\"noopener\">Plan\u00e8te rouge<\/a>\u00a0(si ch\u00e8re \u00e0 <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/02\/26\/traces-de-lastronome-camille-flammarion\/\" target=\"_blank\" rel=\"noopener\">Camille Flammarion<\/a> et <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/11\/27\/percival-lowell-lhomme-qui-aimait-trop-la-planete-mars\/\" target=\"_blank\" rel=\"noopener\">Percival Lowell<\/a>) en janvier 2004, la dur\u00e9e initiale de son activit\u00e9 \u00e9tait de 90 jours. 15 ann\u00e9es plus tard la mission reste un succ\u00e8s retentissant m\u00eame si le rover a envoy\u00e9 son dernier signal en juin 2018, juste avant l&#8217;apparition d&#8217;une gigantesque <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/07\/05\/comment-tempete-sable-transforme-planete-mars\/\" target=\"_blank\" rel=\"noopener\">temp\u00eate<\/a>, la plus grande \u00e0 laquelle le rover ait \u00e9t\u00e9 confront\u00e9.<\/p>\n<figure id=\"attachment_9419\" aria-describedby=\"caption-attachment-9419\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars.jpg\" rel=\"lightbox[10142]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-9419\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-9419\" class=\"wp-caption-text\">Changements d\u2019aspect \u00e0 la surface de Mars en raison d\u2019une temp\u00eate de sable. Le clich\u00e9 de r\u00e9f\u00e9rence \u00e0 gauche a \u00e9t\u00e9 pris dans le pass\u00e9 par Mars Global Surveyor, celui de droite le 28 juin 2018 par l&#8217;astrophotographe anglais Damian Peach. \u00a9 NASA\/Damian Peach<\/figcaption><\/figure>\n<p>Les astronomes ont estim\u00e9 que ce ph\u00e9nom\u00e8ne m\u00e9t\u00e9orologique avait affect\u00e9 une superficie d&#8217;environ 41 millions de kilom\u00e8tres carr\u00e9s, l&#8217;\u00e9quivalent de la Russie et de l\u2019Am\u00e9rique du Nord r\u00e9unies.<!--more--><\/p>\n<p>Opportunity est actuellement stationn\u00e9 au milieu de la vall\u00e9e de la Pers\u00e9v\u00e9rance sur le bord du crat\u00e8re Endeavour. La travers\u00e9e de cette zone \u00e9tait tr\u00e8s attendue par les plan\u00e9tologues qui souhaitaient examiner de plus\u00a0 pr\u00e8s des chenaux qui ont \u00e9t\u00e9 creus\u00e9s par la glace, l\u2019eau ou le vent. Malheureusement, le rover pourrait ne jamais terminer son voyage\u00a0: l&#8217;\u00e9norme temp\u00eate de poussi\u00e8re de l&#8217;\u00e9t\u00e9 dernier a fait chuter la quantit\u00e9 de lumi\u00e8re solaire n\u00e9cessaire au bon fonctionnement d\u2019Opportunity, et le rover est entr\u00e9 en hibernation.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/3b1DxICZbGc\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p style=\"text-align: left\"><em>En 2015 la NASA avait pr\u00e9sent\u00e9 une vid\u00e9o de 8 minutes permettant de revivre en acc\u00e9l\u00e9r\u00e9 les 11 ann\u00e9es de cette incroyable aventure sur Mars. Les images provenaient des cam\u00e9ras panoramiques et de navigation.<\/em><\/p>\n<p>La NASA esp\u00e9rait qu&#8217;une fois la temp\u00eate de poussi\u00e8re termin\u00e9e, les panneaux fonctionneraient \u00e0 nouveau et que le rover recommencerait \u00e0 \u00e9mettre un signal, comme cela s&#8217;\u00e9tait d\u00e9j\u00e0 produit par le pass\u00e9. Mais cette fois-ci Opportunity est rest\u00e9 d\u00e9sesp\u00e9r\u00e9ment muet malgr\u00e9 les \u00e9coutes permanentes du r\u00e9seau DSN (<a href=\"https:\/\/deepspace.jpl.nasa.gov\/\" target=\"_blank\" rel=\"noopener\"><em>Deep Space Network<\/em><\/a>), un ensemble d&#8217;antennes radio r\u00e9parties dans le monde entier qui permettent \u00e0 un vaisseau spatial de communiquer avec la Terre. Opportunity est r\u00e9guli\u00e8rement survol\u00e9 par MRO (<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/02\/15\/insolite-le-rover-martien-curiosity-vu-par-lorbiteur-mro\/\" target=\"_blank\" rel=\"noopener\"><em>Mars Reconnaissance Orbiter<\/em><\/a>), mais la r\u00e9solution des images ne permet pas de savoir si le mutisme du rover est li\u00e9 \u00e0 un probl\u00e8me de poussi\u00e8re sur ses panneaux solaires ou s&#8217;il y a autre chose.<\/p>\n<figure id=\"attachment_10147\" aria-describedby=\"caption-attachment-10147\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/01\/DSN.jpg\" rel=\"lightbox[10142]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10147\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/01\/DSN-450x325.jpg\" alt=\"\" width=\"450\" height=\"325\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/01\/DSN-450x325.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/01\/DSN-768x555.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/01\/DSN-1024x740.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/01\/DSN.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-10147\" class=\"wp-caption-text\">Les antennes du Deep Space Network esp\u00e8rent entendre la &#8220;voix&#8221; d&#8217;Opportunity. \u00a9 NASA<\/figcaption><\/figure>\n<p>Le temps presse maintenant\u00a0: l&#8217;automne arrive sur Mars et sera suivi d&#8217;un hiver tr\u00e8s rigoureux dans quelques mois avec des temp\u00e9ratures qui pourront descendre jusqu&#8217;\u00e0 -96 \u00b0 C. C&#8217;est d&#8217;ailleurs sans doute ce froid extr\u00eame qui est \u00e0 l&#8217;origine de la perte d&#8217;un autre rover en 2010, Spirit. Si Opportunity ne donne plus aucun signe de vie, les plan\u00e9tologues se souviendront de son exceptionnelle long\u00e9vit\u00e9 et de son incroyable aventure\u00a0: son compteur kilom\u00e9trique est bloqu\u00e9 \u00e0 45,16 km ce qui reste un exploit remarquable \u00e0 tous points de vue. Sans oublier les autres missions en cours sur le sol martien, <a href=\"https:\/\/www.futura-sciences.com\/sciences\/breves\/mars-curiosity-decouvre-etrange-objet-brillant-mars-238\/\" target=\"_blank\" rel=\"noopener\">Curiosity<\/a> et <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronautique-insight-sismometre-seis-ete-teste-succes-41109\/\" target=\"_blank\" rel=\"noopener\">InSight<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Sur Mars le rover Opportunity n\u2019a plus donn\u00e9 signe de vie depuis l\u2019\u00e9t\u00e9 dernier, mais la NASA esp\u00e8re encore renouer le contact. Lorsque Opportunity a atterri dans la r\u00e9gion de Meridiani Planum sur la Plan\u00e8te rouge\u00a0(si ch\u00e8re \u00e0 Camille Flammarion et Percival Lowell) en janvier 2004, la dur\u00e9e initiale de son activit\u00e9 \u00e9tait de 90 &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/01\/20\/a-t-on-definitivement-perdu-le-rover-martien-opportunity\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">A-t-on d\u00e9finitivement perdu le rover martien Opportunity ?<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":1700,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[780,2627,116,771,776,115],"class_list":["post-10142","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-cratere-endeavour","tag-deep-space-network","tag-mars","tag-mro","tag-opportunity","tag-planete-rouge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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