{"id":12540,"date":"2020-09-30T08:15:30","date_gmt":"2020-09-30T08:15:30","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=12540"},"modified":"2020-10-13T09:24:31","modified_gmt":"2020-10-13T09:24:31","slug":"polymele-mission-dobservation-exceptionnelle-au-senegal","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/30\/polymele-mission-dobservation-exceptionnelle-au-senegal\/","title":{"rendered":"Polym\u00e8le : mission d&#8217;observation exceptionnelle au S\u00e9n\u00e9gal"},"content":{"rendered":"<p><strong>Une coop\u00e9ration internationale a permis d&#8217;observer avec succ\u00e8s une occultation d&#8217;\u00e9toile par Polym\u00e8le. Cet ast\u00e9ro\u00efde doit \u00eatre survol\u00e9 par une sonde en 2027.\u00a0\u00a0<\/strong><\/p>\n<h5>Des Troyens pour Lucy :<\/h5>\n<p>En octobre 2021, la NASA a pr\u00e9vu de lancer <a href=\"https:\/\/www.nasa.gov\/content\/goddard\/lucy-overview\" target=\"_blank\" rel=\"noopener noreferrer\">Lucy<\/a>. Cette sonde doit survoler pas moins de six ast\u00e9ro\u00efdes entre 2027 et 2033. Si Donaldjohanson est un membre de <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-ceinture-asteroides-6358\/\" target=\"_blank\" rel=\"noopener noreferrer\">la ceinture principale<\/a>, les cinq autres sont des <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/planetes-asteroide-troyen-13533\/\" target=\"_blank\" rel=\"noopener noreferrer\">ast\u00e9ro\u00efdes troyens<\/a>. Ces derniers se situent aux points de Lagrange L4 et L5 de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/23\/la-sonde-juno-immortalise-lombre-de-io-sur-jupiter\/\" target=\"_blank\" rel=\"noopener noreferrer\">Jupiter<\/a>.<\/p>\n<figure id=\"attachment_12548\" aria-describedby=\"caption-attachment-12548\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/troy.jpg\" rel=\"lightbox[12540]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12548\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/troy-450x307.jpg\" alt=\"\" width=\"450\" height=\"307\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/troy-450x307.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/troy-1024x699.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/troy-768x524.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/troy.jpg 1386w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12548\" class=\"wp-caption-text\">Trajectoire de la sonde am\u00e9ricaine Lucy. \u00a9 Southwest Research Institute<\/figcaption><\/figure>\n<p>Lucy ira successivement \u00e0 la rencontre de <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/asteroides-asteroide-eurybates-sera-survole-lucy-lune-79159\/\" target=\"_blank\" rel=\"noopener noreferrer\">3548-Eurybate<\/a> (dont on a d\u00e9couvert une lune en janvier 2020), 15094-Polym\u00e8le, 11351-Leucos, 21900-Oros et 617-Patrocle-M\u00e9n\u00e9tios (un autre ast\u00e9ro\u00efde double).<!--more--><\/p>\n<h5>Des occultations tr\u00e8s utiles :<\/h5>\n<p>Une mani\u00e8re \u00e9l\u00e9gante d&#8217;en savoir un peu plus sur un ast\u00e9ro\u00efde avant d&#8217;aller lui rendre visite consiste \u00e0 observer son passage devant une \u00e9toile. En mesurant la dur\u00e9e d&#8217;occultation de l&#8217;\u00e9toile depuis diff\u00e9rents endroits on peut d\u00e9terminer la forme et l&#8217;alb\u00e9do (l&#8217;\u00e9clat) de l&#8217;ast\u00e9ro\u00efde (lire \u00e9galement <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/22\/pour-new-horizons-les-astronomes-traquent-2014-mu69\/\" target=\"_blank\" rel=\"noopener noreferrer\">Pour New Horizons, les astronomes traquent 2014 MU69<\/a>). Ce fut le cas pour Polym\u00e8le dans la nuit du 23 au 24 septembre. Un ph\u00e9nom\u00e8ne qui n&#8217;\u00e9tait observable que depuis les environs de la ville s\u00e9n\u00e9galaise\u00a0 de Kaolack.<\/p>\n<figure id=\"attachment_7951\" aria-describedby=\"caption-attachment-7951\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/06\/mu69.jpg\" rel=\"lightbox[12540]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-7951\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/06\/mu69-450x296.jpg\" alt=\"\" width=\"450\" height=\"296\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/06\/mu69-450x296.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/06\/mu69-768x506.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/06\/mu69.jpg 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-7951\" class=\"wp-caption-text\">En 2017 des astronomes avaient observ\u00e9 des occultations d&#8217;\u00e9toiles par 2014 MU69, un petit corps rocheux qu&#8217;a survol\u00e9 deux ans plus tard la sonde New Horizons. \u00a9 J. Jewell<\/figcaption><\/figure>\n<h5>Une premi\u00e8re au S\u00e9n\u00e9gal :<\/h5>\n<p>L&#8217;Afrique de l&#8217;Ouest semble port\u00e9e par un vent de d\u00e9veloppement astronomique. Apr\u00e8s le Burkina Faso et son astrophysicienne <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/03\/08\/lafrique-de-louest-a-sa-premiere-astrophysicienne\/\" target=\"_blank\" rel=\"noopener noreferrer\">Marie Korsaga<\/a>, c&#8217;est le S\u00e9n\u00e9gal qui a lev\u00e9 les yeux vers le ciel.\u00a0 L&#8217;observation de cette occultation \u00e9tait parrain\u00e9e par la NASA qui a envoy\u00e9 1,5 tonne de mat\u00e9riel dont 19 t\u00e9lescopes. La mission a \u00e9t\u00e9 financ\u00e9e en grande partie par l&#8217;<a href=\"https:\/\/www.ird.fr\/\" target=\"_blank\" rel=\"noopener noreferrer\">IRD<\/a> et le <a href=\"https:\/\/www.cnrs.fr\/fr\/page-daccueil\" target=\"_blank\" rel=\"noopener noreferrer\">CNRS<\/a>. Une \u00e9quipe franco belge de six chercheurs s&#8217;est rendue sur place pour travailler avec une trentaine d&#8217;astronomes s\u00e9n\u00e9galais. Trois jours de pr\u00e9paration et de r\u00e9p\u00e9tition avant la nuit de l&#8217;occultation, du 23 au 24 septembre.<\/p>\n<p>Jusqu&#8217;\u00e0 la derni\u00e8re minute des pluies diluviennes ont laiss\u00e9 craindre le pire. Finalement l&#8217;un des trois sites sur lesquels se sont r\u00e9partis les observateurs a b\u00e9n\u00e9fici\u00e9 d&#8217;une m\u00e9t\u00e9o cl\u00e9mente. Le groupe a pu enregistrer en vid\u00e9o l&#8217;extinction de l&#8217;\u00e9toile pendant un peu plus d&#8217;une seconde par Polym\u00e8le, distant de plus de 700 millions de kilom\u00e8tres.<\/p>\n<figure id=\"attachment_12558\" aria-describedby=\"caption-attachment-12558\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/courbe2.jpg\" rel=\"lightbox[12540]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12558\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/courbe2-450x375.jpg\" alt=\"\" width=\"450\" height=\"375\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/courbe2-450x375.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/courbe2-768x640.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/courbe2.jpg 820w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12558\" class=\"wp-caption-text\">Exemple de simulation de l&#8217;occultation d&#8217;une \u00e9toile par un petit ast\u00e9ro\u00efde. La courbe de lumi\u00e8re et ses oscillations sont donn\u00e9es en rouge. Cr\u00e9dit : Observatoire de Paris, Lesia<\/figcaption><\/figure>\n<h5>Bilan tr\u00e8s positif :<\/h5>\n<p>Comme le souligne\u00a0le Coordonnateur de la Mission <a href=\"https:\/\/www.youtube.com\/watch?v=jPjSBxEHDeA\" target=\"_blank\" rel=\"noopener noreferrer\">Maram Ka\u00efr\u00e9<\/a>, pr\u00e9sident de l\u2019<a href=\"https:\/\/www.facebook.com\/astronomiesenegal\/\" target=\"_blank\" rel=\"noopener noreferrer\">ASPA<\/a> (Association S\u00e9n\u00e9galaise pour la Promotion de l\u2019Astronomie) et auteur des clich\u00e9s ci-dessous, &#8220;<em>cette mission a \u00e9t\u00e9 une tr\u00e8s belle collaboration entre les scientifiques s\u00e9n\u00e9galais et le membres de l&#8217;\u00e9quipe franco-belge. Les riches \u00e9changes lors des journ\u00e9es de pr\u00e9paration ont permis de tisser des liens durables entre les scientifiques qui ne peuvent qu&#8217;\u00eatre b\u00e9n\u00e9fiques au d\u00e9veloppement de la coop\u00e9ration entre les diff\u00e9rents pays<\/em>.&#8221;<\/p>\n<div id='gallery-1' class='gallery galleryid-12540 gallery-columns-3 gallery-size-thumbnail'><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/30\/polymele-mission-dobservation-exceptionnelle-au-senegal\/sen1\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/sen1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/30\/polymele-mission-dobservation-exceptionnelle-au-senegal\/sen2\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/sen2-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/30\/polymele-mission-dobservation-exceptionnelle-au-senegal\/sen3\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/sen3-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/30\/polymele-mission-dobservation-exceptionnelle-au-senegal\/sen4\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/sen4-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/30\/polymele-mission-dobservation-exceptionnelle-au-senegal\/sen5\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/sen5-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/30\/polymele-mission-dobservation-exceptionnelle-au-senegal\/sen6\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/sen6-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-1-12547\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-1-12547'>\n\t\t\t\tMission d&#8217;observation au S\u00e9n\u00e9gal. \u00a9 Maram Ka\u00efr\u00e9\n\t\t\t\t<\/figcaption><\/figure>\n\t\t<\/div>\n\n<ul>\n<li>Composition de l&#8217;\u00e9quipe s\u00e9n\u00e9galaise : Maram Ka\u00efr\u00e9, Lat Tabara Sow, Baidy Demba Diop, Omar Diou, Dembo Diakhite, Di\u00e8ne Ndiaye, Labaly Toure, Mactar Faye, Diogoye Diouf, Gualbert Seraphin Dorego, Abdoulaye Ba, Modou Jamal Mbaye, Mansour Sylla, Thierno Diop, Riad Kawar, Mamadou Balde, Abdoulaye Sow, Cheikh Ab Niang, Alarba Kande, Thierno Ba Thier, Marame Ngom, Mohamadou Ndiaye, Ilam Mee Loubane, Aissata Thiam, Samba Guorgui Mane, Omar Marigo, Makhoudia Fall, Mor Cisse.<\/li>\n<li>Composition de l&#8217;\u00e9quipe franco-belge : David Baratoux, Francois Colas, Sylvain Bouley, Katrien Kolenberg, Mamadou N&#8217;Diaye, Eric Lagadec.<\/li>\n<\/ul>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Une coop\u00e9ration internationale a permis d&#8217;observer avec succ\u00e8s une occultation d&#8217;\u00e9toile par Polym\u00e8le. Cet ast\u00e9ro\u00efde doit \u00eatre survol\u00e9 par une sonde en 2027.\u00a0\u00a0 Des Troyens pour Lucy : En octobre 2021, la NASA a pr\u00e9vu de lancer Lucy. Cette sonde doit survoler pas moins de six ast\u00e9ro\u00efdes entre 2027 et 2033. Si Donaldjohanson est un &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/30\/polymele-mission-dobservation-exceptionnelle-au-senegal\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Polym\u00e8le : mission d&#8217;observation exceptionnelle au S\u00e9n\u00e9gal<\/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":12541,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[240,90,486,2921],"class_list":["post-12540","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-asteroide","tag-jupiter","tag-nasa","tag-polymele"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Polym\u00e8le : mission d&#039;observation exceptionnelle au S\u00e9n\u00e9gal<\/title>\n<meta name=\"description\" content=\"Une coop\u00e9ration internationale a permis d&#039;observer avec succ\u00e8s une occultation d&#039;\u00e9toile par Polym\u00e8le. 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