{"id":88513,"date":"2024-10-06T18:17:22","date_gmt":"2024-10-06T18:17:22","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/la-sonde-hera-bientot-en-route-pour-etudier-un-asteroide-devie-par-la-nasa"},"modified":"2024-10-06T19:32:09","modified_gmt":"2024-10-06T19:32:09","slug":"la-sonde-hera-bientot-en-route-pour-etudier-un-asteroide-devie-par-la-nasa","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/la-sonde-hera-bientot-en-route-pour-etudier-un-asteroide-devie-par-la-nasa","title":{"rendered":"La sonde Hera bient\u00f4t en route pour \u00e9tudier un ast\u00e9ro\u00efde d\u00e9vi\u00e9 par la Nasa"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>Percute\u0301 par un vaisseau de la Nasa pour de\u0301vier sa trajectoire, l&rsquo;aste\u0301roi\u0308de Dimorphos va de\u0301sormais e\u0302tre e\u0301tudie\u0301 par la sonde europe\u0301enne Hera, dont le lancement est pre\u0301vu lundi afin d&rsquo;apprendre comment prote\u0301ger l&rsquo;humanite\u0301 d&rsquo;une e\u0301ventuelle menace future.<\/p>\n<p>Dans un sce\u0301nario digne d&rsquo;Hollywood, le vaisseau de la mission Dart s&rsquo;e\u0301tait de\u0301libe\u0301re\u0301ment e\u0301crase\u0301 en 2022 sur l&rsquo;aste\u0301roi\u0308de Dimorphos, la Lune d&rsquo;un aste\u0301roi\u0308de plus grand nomme\u0301 Didymos.<\/p>\n<p>Cette mission test ine\u0301dite de de\u0301fense plane\u0301taire devait voir s&rsquo;il e\u0301tait possible de de\u0301vier sa trajectoire, au cas ou\u0300 un aste\u0301roi\u0308de menacerait un jour de frapper la Terre.<\/p>\n<p>On estime qu&rsquo;un objet de un kilome\u0300tre (de\u0301clenchant une catastrophe globale comme l&rsquo;extinction des dinosaures) s&rsquo;e\u0301crase sur la Terre tous les 500.000 ans, et un aste\u0301roi\u0308de de 140 m (le seuil d&rsquo;une catastrophe re\u0301gionale) tous les 20.000 ans.<\/p>\n<p>Parmi ces objets ge\u0301ocroiseurs, dont la plupart proviennent de la ceinture d&rsquo;aste\u0301roi\u0308des entre Mars et Jupiter, quasiment tous ceux de un kilome\u0300tre sont connus et aucun ne menace la Terre dans le sie\u0300cle a\u0300 venir.<\/p>\n<p>Aucune menace directe n&rsquo;a non plus e\u0301te\u0301 recense\u0301e pour ceux de 140 m. Mais seulement 40% d&rsquo;entre eux ont e\u0301te\u0301 identifie\u0301s.<\/p>\n<p>S&rsquo;il s&rsquo;agit donc d&rsquo;un risque naturel \u00ab\u00a0parmi les moins probables\u00a0\u00bb, on a \u00ab\u00a0l&rsquo;avantage de pouvoir mener des actions pour s&rsquo;en prote\u0301ger\u00a0\u00bb, a indique\u0301 lors d&rsquo;un point de presse Patrick Michel, responsable scientifique de la mission Hera de l&rsquo;Agence spatiale europe\u0301enne (ESA).<\/p>\n<p>Dimorphos, situe\u0301 a\u0300 quelque 11 millions de kilome\u0300tres de la Terre au moment de l&rsquo;impact, mesurait environ 160 m de diame\u0300tre et ne repre\u0301sentait aucun danger pour notre plane\u0300te.<\/p>\n<p>En le percutant, l&rsquo;appareil de la Nasa, de la taille d&rsquo;un gros re\u0301frige\u0301rateur, est parvenu a\u0300 le de\u0301placer en re\u0301duisant son orbite de 33 minutes.<\/p>\n<p>Mais on ne sait pas quels effets l&rsquo;impact a eu sur le petit aste\u0301roi\u0308de, ni me\u0302me quelle e\u0301tait sa structure interne avant celui-ci.<\/p>\n<p>Or si l&rsquo;expe\u0301rience Dart (Double Asteroid Redirection Test) a permis de de\u0301montrer la faisabilite\u0301 de la technique, il faut en savoir plus pour la valider et e\u0302tre capable de de\u0301terminer quelle e\u0301nergie serait ne\u0301cessaire le cas e\u0301che\u0301ant pour de\u0301vier effectivement un aste\u0301roi\u0308de menac\u0327ant.<\/p>\n<p>&#8211; Nanosatellites &#8211;<\/p>\n<p>Les simulations nume\u0301riques laissent penser que Dimorphos est un agglome\u0301rat de roches lie\u0301es entre elles par la gravite\u0301, un corps ayant tre\u0300s peu de re\u0301sistance dans lequel \u00ab\u00a0on s&rsquo;enfonce comme dans un sable sans cohe\u0301sion\u00a0\u00bb, avance M. Michel.<\/p>\n<p>\u00ab\u00a0La conse\u0301quence, c&rsquo;est qu&rsquo;au lieu de faire un crate\u0300re\u00a0\u00bb, Dart aurait \u00ab\u00a0comple\u0300tement de\u0301forme\u0301\u00a0\u00bb Dimorphos, ajoute-t-il.<\/p>\n<p>Mais il y a \u00ab\u00a0d&rsquo;autres possibilite\u0301s\u00a0\u00bb, les scientifiques ayant encore du mal a\u0300 comprendre ces corps a\u0300 la tre\u0300s faible gravite\u0301, \u00ab\u00a0dont le comportement de\u0301fie l&rsquo;intuition\u00a0\u00bb, selon M. Michel.<\/p>\n<p>D&rsquo;un cou\u0302t de 363 millions d&rsquo;euros et e\u0301quipe\u0301 de 12 instruments, Hera va embarquer avec lui deux nanosatellites, Juventas et Milani.<\/p>\n<p>Le premier va essayer de se poser sur Dimorphos, une premie\u0300re sur un objet aussi petit. Il est e\u0301quipe\u0301 d&rsquo;un radar basse fre\u0301quence et d&rsquo;un gravime\u0300tre pour sonder la structure de l&rsquo;aste\u0301roi\u0308de et mesurer son champ de gravite\u0301.<\/p>\n<p>Le deuxie\u0300me e\u0301tudiera la composition de Dimorphos a\u0300 l&rsquo;aide d&rsquo;une came\u0301ra multispectrale et d&rsquo;un de\u0301tecteur de poussie\u0300res.<\/p>\n<p>La sonde doit normalement e\u0302tre lance\u0301e lundi depuis Cap Canaveral (Etats-Unis), dans la coiffe d&rsquo;une fuse\u0301e Falcon 9. Mais une anomalie re\u0301cemment de\u0301tecte\u0301e sur le lanceur de SpaceX pourrait obliger a\u0300 reporter ce lancement.<\/p>\n<p>Dimanche les autorite\u0301s ame\u0301ricaines ont annonce\u0301 avoir autorise\u0301 le retour en vol du lanceur, \u00ab\u00a0uniquement pour la mission Hera pre\u0301vue le 7 octobre\u00a0\u00bb, du fait de l&rsquo;absence d&rsquo;un retour du lanceur vers la Terre qui \u00ab\u00a0limite les risques pour le public\u00a0\u00bb, selon un communique\u0301 de l&rsquo;Administration fe\u0301de\u0301rale de l&rsquo;aviation (FAA).<\/p>\n<p>La fene\u0302tre de tir court jusqu&rsquo;au 27 octobre. Apre\u0300s un survol de Mars l&rsquo;anne\u0301e prochaine, Hera arrivera pre\u0300s de Dimorphos en de\u0301cembre 2026, pour une dure\u0301e initiale de six mois.<\/p>\n<p>Au terme de sa mission, les responsables d&rsquo;Hera espe\u0300rent de\u0301ja\u0300 offrir a\u0300 la sonde une fin comparable a\u0300 celle de son ance\u0302tre Rosetta, qui avait explore\u0301 la come\u0300te Tchourioumov-Gue\u0301rassimenko entre 2014 et 2016, en la posant de\u0301licatement sur Dimorphos ou Didymos avant qu&rsquo;elle ne s&rsquo;e\u0301teigne.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la C\u00f4te d&rsquo;Ivoire, suivez Africa-Press<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Percute\u0301 par un vaisseau de la Nasa pour de\u0301vier sa trajectoire, l&rsquo;aste\u0301roi\u0308de Dimorphos va de\u0301sormais e\u0302tre e\u0301tudie\u0301 par la sonde europe\u0301enne Hera, dont le lancement est pre\u0301vu lundi afin d&rsquo;apprendre comment prote\u0301ger l&rsquo;humanite\u0301 d&rsquo;une e\u0301ventuelle menace future. Dans un sce\u0301nario digne d&rsquo;Hollywood, le vaisseau de la mission Dart s&rsquo;e\u0301tait de\u0301libe\u0301re\u0301ment e\u0301crase\u0301 [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":88512,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[29],"class_list":["post-88513","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>La sonde Hera bient\u00f4t en route pour \u00e9tudier un ast\u00e9ro\u00efde d\u00e9vi\u00e9 par la Nasa - C\u00f4te d&#039;Ivoire<\/title>\n<meta name=\"description\" content=\"Percute\u0301 par un vaisseau de la Nasa pour de\u0301vier sa trajectoire, 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