{"id":12847,"date":"2024-04-05T12:00:00","date_gmt":"2024-04-05T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/la-mission-proba-3-va-inaugurer-la-voltige-de-satellites"},"modified":"2024-04-06T12:19:46","modified_gmt":"2024-04-06T12:19:46","slug":"la-mission-proba-3-va-inaugurer-la-voltige-de-satellites","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/la-mission-proba-3-va-inaugurer-la-voltige-de-satellites","title":{"rendered":"La mission Proba-3 va inaugurer la voltige de satellites"},"content":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>Un vol d\u2019une infime pre\u0301cision, au millime\u0300tre pre\u0300s, entre deux satellites, a\u0300 plus de 60.000 km de la Terre: c\u2019est le de\u0301fi de la mission Proba-3 pour observer la couronne du Soleil avec un luxe de de\u0301tails, pre\u0301sente\u0301e a\u0300 la presse mercredi a\u0300 Anvers (Belgique). La couronne, cette \u201catmosphe\u0300re\u201d du Soleil, de\u0301fie encore largement la compre\u0301hension. Invisible a\u0300 l\u2019\u0153il nu comme avec de simples te\u0301lescopes, aveugle\u0301s par la brillance de l\u2019astre, elle s\u2019e\u0301tend sur une e\u0301paisseur de plusieurs millions de kilome\u0300tres. Seule une e\u0301clipse totale de Soleil par la Lune en a re\u0301ve\u0301le\u0301 l\u2019existence aux premiers astronomes, avant qu\u2019un Franc\u0327ais, Bernard Lyot, n\u2019invente au 20e sie\u0300cle le premier coronographe, en disposant l\u2019e\u0301quivalent d\u2019un disque lunaire dans un te\u0301lescope. Cette invention a fait flore\u0300s et la mission Proba-3 de l\u2019Agence spatiale europe\u0301enne (ESA) va la de\u0301cliner de fac\u0327on innovante. En septembre prochain, une fuse\u0301e indienne va la\u0302cher dans l\u2019espace deux satellites qui travailleront en tandem pendant deux ans, en circulant sur une orbite hautement elliptique, une boucle faisant passer les engins de quelque 600 km d\u2019altitude jusqu\u2019a\u0300 60.000 km de la Terre. E\u0301quipe\u0301 d\u2019un large bouclier d\u20191,40 me\u0300tre de diame\u0300tre, le premier satellite jouera le ro\u0302le de la Lune en occultant l\u2019astre solaire. Il sera suivi de pre\u0300s par le second satellite, portant le coronographe ASPIICS, qui pourra ainsi observer la couronne solaire, dans la pe\u0301nombre cre\u0301e\u0301e par l\u2019occulteur. L\u2019ope\u0301ration demandera une pre\u0301cision encore jamais atteinte dans un tel exercice de vol en formation, effectue\u0301 a\u0300 144 me\u0300tres de distance. Une distance qui sera respecte\u0301e au millime\u0300tre pre\u0300s pour une observation optimale, la\u0300 ou\u0300 celle d\u2019une mission expe\u0301rimentale pre\u0301ce\u0301dente, PRISMA il y a plus de dix ans, atteignait le de\u0301cime\u0300tre. La mission a un double inte\u0301re\u0302t, astronomique et technologique. D\u2019abord observer la couronne solaire dans son ensemble, et ainsi comple\u0301menter les observations des deux sondes Solar Orbiter et Parker Solar Probe, explique a\u0300 l\u2019AFP Raphae\u0308l Rougeot, inge\u0301nieur syste\u0300mes a\u0300 l\u2019ESA et spe\u0301cialiste du coronographe ASPIICS. \u2013 De\u0301monstration technologique \u2013<\/strong> Avec cet instrument, \u201con espe\u0300re pouvoir observer la couronne solaire tre\u0300s proche du Soleil\u201d, dit-il. Et ainsi aider a\u0300 percer l\u2019e\u0301nigme de la tempe\u0301rature de ce milieu tre\u0300s peu dense qui se mesure en million de degre\u0301s alors qu\u2019elle plafonne en-dessous, a\u0300 la surface du Soleil, a\u0300 seulement 6.000 degre\u0301s. Ce phe\u0301nome\u0300ne est \u201cencore mal compris et peut-e\u0302tre lie\u0301 a\u0300 des phe\u0301nome\u0300nes magne\u0301tiques\u201d, selon Raphae\u0308l Rougeot. Tout comme la physique voulant que la couronne soit la source du vent solaire \u201cet surtout des e\u0301jections de masse coronale, ces gigantesques vagues de plasma et de champs magne\u0301tiques qui peuvent avoir des impacts sur la Terre et son environnement\u201d, poursuit l\u2019inge\u0301nieur. Des e\u0301ve\u0300nements pouvant endommager satellites et installations terrestres. Proba-3 est aussi une mission de de\u0301monstration technologique, explique Damien Galano, responsable du projet a\u0300 l\u2019ESA. Le vol en formation permet \u201cdans le principe de +construire+ des syste\u0300mes de grande taille avec plusieurs e\u0301le\u0301ments se\u0301pare\u0301s\u201d, explique-t-il a\u0300 l\u2019AFP. Comme imagine\u0301 par exemple dans des avant-projets d\u2019interfe\u0301rome\u0301trie spatiale ou de te\u0301lescope rayon X a\u0300 longue focale. Plus prosai\u0308quement, rele\u0300ve l\u2019expert, mai\u0302triser le vol en formation c\u2019est aussi \u201cavoir des capteurs et algorithmes a\u0300 bord permettant la navigation, le guidage et le contro\u0302le de la position relative entre diffe\u0301rents objets\u201d. Le tout de fac\u0327on automatise\u0301e et autonome. Pour Proba-3, il s\u2019agit notamment d\u2019un capteur optique a\u0300 reconnaissance d\u2019image et surtout un capteur laser qui fournira une mesure de distance pre\u0301cise entre les deux satellites. A charge pour le satellite occulteur de re\u0301gler finement la distance le se\u0301parant de son satellite suiveur gra\u0302ce a\u0300 un syste\u0300me de micropropulsion. De telles technologies pourraient a\u0300 terme trouver une application pour des services en orbite, pour re\u0301parer ou assembler des syste\u0300mes, ou les retirer de l\u2019espace, pre\u0301cise Damien Galano. La mission Proba-3 est le fruit, pour le compte de l\u2019ESA, d\u2019une collaboration de 14 pays, mene\u0301e par le groupe de technologie espagnol Sener et du belge Spacebel, avec l\u2019implication d\u2019Airbus qui a construit les plateforme-satellites et de l\u2019entreprise ame\u0301ricaine Redwire qui a inte\u0301gre\u0301 tous les e\u0301le\u0301ments. Pour plus d’informations et d’analyses sur la S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. Un vol d\u2019une infime pre\u0301cision, au millime\u0300tre pre\u0300s, entre deux satellites, a\u0300 plus de 60.000 km de la Terre: c\u2019est le de\u0301fi de la mission Proba-3 pour observer la couronne du Soleil avec un luxe de de\u0301tails, pre\u0301sente\u0301e a\u0300 la presse mercredi a\u0300 Anvers (Belgique). La couronne, cette \u201catmosphe\u0300re\u201d […]<\/p>\n","protected":false},"author":82,"featured_media":12846,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-12847","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"yoast_head":"\nLa mission Proba-3 va inaugurer la voltige de satellites - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"Un vol d\u2019une infime pre\u0301cision, au millime\u0300tre pre\u0300s, entre deux satellites, a\u0300 plus de 60.000 km de la Terre: c\u2019est le ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/la-mission-proba-3-va-inaugurer-la-voltige-de-satellites\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La mission Proba-3 va inaugurer la voltige de satellites\" \/>\n<meta property=\"og:description\" content=\"Un vol d\u2019une infime pre\u0301cision, au millime\u0300tre pre\u0300s, entre deux satellites, a\u0300 plus de 60.000 km de la Terre: c\u2019est le ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/la-mission-proba-3-va-inaugurer-la-voltige-de-satellites\" \/>\n<meta property=\"og:site_name\" content=\"S\u00e3o Tom\u00e9 e Pr\u00edncipe\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-05T12:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-06T12:19:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/sao-tome-e-principe\/sites\/59\/2024\/04\/sm_1712389391.419173.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/la-mission-proba-3-va-inaugurer-la-voltige-de-satellites#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/la-mission-proba-3-va-inaugurer-la-voltige-de-satellites\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/sao-tome-e-principe\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"La mission Proba-3 va inaugurer la voltige de satellites\",\"datePublished\":\"2024-04-05T12:00:00+00:00\",\"dateModified\":\"2024-04-06T12:19:46+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/la-mission-proba-3-va-inaugurer-la-voltige-de-satellites\"},\"wordCount\":833,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/la-mission-proba-3-va-inaugurer-la-voltige-de-satellites#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/sao-tome-e-principe\/sites\/59\/2024\/04\/sm_1712389391.419173.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-S\u00e3o Tom\u00e9 e Pr\u00edncipe\",\"S\u00e3o Tom\u00e9 e Pr\u00edncipe\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/la-mission-proba-3-va-inaugurer-la-voltige-de-satellites#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/la-mission-proba-3-va-inaugurer-la-voltige-de-satellites\",\"url\":\"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/la-mission-proba-3-va-inaugurer-la-voltige-de-satellites\",\"name\":\"La mission Proba-3 va inaugurer la voltige de satellites - 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