{"id":15027,"date":"2021-11-10T13:56:05","date_gmt":"2021-11-10T13:56:05","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15027"},"modified":"2021-11-15T17:16:33","modified_gmt":"2021-11-15T17:16:33","slug":"le-11-novembre-une-etoile-va-seteindre-pendant-20-secondes","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/10\/le-11-novembre-une-etoile-va-seteindre-pendant-20-secondes\/","title":{"rendered":"Le 11 novembre, une \u00e9toile va s&#8217;\u00e9teindre pendant 20 secondes"},"content":{"rendered":"<p><strong>Le 11 novembre avant l&#8217;aube, la lumi\u00e8re d&#8217;une \u00e9toile dans la constellation du Triangle sera masqu\u00e9e par le passage d&#8217;un ast\u00e9ro\u00efde.<\/strong><\/p>\n<h5>Des occultations tr\u00e8s utiles :<\/h5>\n<p>Le 11 novembre 2021, avant que le jour ne se l\u00e8ve en Europe, de nombreux astronomes seront derri\u00e8re leur t\u00e9lescope. Un peu avant 4 heures, ils guetteront l&#8217;extinction de l&#8217;\u00e9toile UCAC4 616-007599. Cet astre de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 11,7 est situ\u00e9 dans la constellation du Triangle. Il sera occult\u00e9 par l&#8217;ast\u00e9ro\u00efde 2002 TC 302 pendant une vingtaine de secondes au maximum. Observer l&#8217;extinction d&#8217;une \u00e9toile est une mani\u00e8re \u00e9l\u00e9gante d&#8217;en savoir un peu plus sur l&#8217;ast\u00e9ro\u00efde auquel on ne peut pas rendre visite.<\/p>\n<figure id=\"attachment_15029\" aria-describedby=\"caption-attachment-15029\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/occ2.jpg\" rel=\"lightbox[15027]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15029\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/occ2-450x414.jpg\" alt=\"\" width=\"450\" height=\"414\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/occ2-450x414.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/occ2.jpg 456w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15029\" class=\"wp-caption-text\">L&#8217;observation d&#8217;une occultation d&#8217;\u00e9toile par un ast\u00e9ro\u00efde permet de r\u00e9v\u00e9ler la forme de ce dernier. Chaque trait correspond \u00e0 la mesure de lumi\u00e8re obtenue par un observateur. Les astronomes se r\u00e9partissent sur une ligne perpendiculaire \u00e0 la trajectoire de l&#8217;ombre de l&#8217;ast\u00e9ro\u00efde pour en d\u00e9finir le contour. \u00a9 IOTA<\/figcaption><\/figure>\n<p>En mesurant la dur\u00e9e d\u2019occultation de l\u2019\u00e9toile depuis diff\u00e9rents endroits, on peut d\u00e9terminer la forme (voir ci-dessus) et l\u2019alb\u00e9do (l\u2019\u00e9clat) de ce corps c\u00e9leste. En 2014, les astronomes avaient par exemple \u00e9tudi\u00e9 trois occultations d&#8217;\u00e9toiles par<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/22\/pour-new-horizons-les-astronomes-traquent-2014-mu69\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u00a02014 MU69<\/a>. <!--more--><\/p>\n<h5>Un ast\u00e9ro\u00efde accompagn\u00e9 d&#8217;une lune ?<\/h5>\n<p>L&#8217;ast\u00e9ro\u00efde 2002 TC 302 a \u00e9t\u00e9 d\u00e9couvert il y a une vingtaine d&#8217;ann\u00e9es par le programme <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Near_Earth_Asteroid_Tracking\" target=\"_blank\" rel=\"noopener\">NEAT<\/a>. C&#8217;est un objet massif qui fait partie de la <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-ceinture-kuiper-3865\/\" target=\"_blank\" rel=\"noopener\">ceinture de Kuiper<\/a>. D&#8217;une taille estim\u00e9e \u00e0 580 km de long lors de sa d\u00e9couverte, 2002 TC 302 pourrait presque faire partie de la famille des <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-planete-naine-5149\/\" target=\"_blank\" rel=\"noopener\">plan\u00e8tes naines<\/a>. Mais si cet ast\u00e9ro\u00efde intrigue tant les astronomes, c&#8217;est qu&#8217;il cache un myst\u00e8re. Lorsqu&#8217;il a \u00e9t\u00e9 observ\u00e9 au cours d&#8217;une occultation d&#8217;\u00e9toile en janvier 2018, il ne mesurait plus que 500 kilom\u00e8tres ! On a alors avanc\u00e9 l&#8217;id\u00e9e que 2002 TC 302 pourrait \u00eatre accompagn\u00e9 d&#8217;une petite lune qui tournerait autour. Soit les deux astres sont accol\u00e9s, soit la petite lune est invisible quand elle se trouve devant ou derri\u00e8re l&#8217;ast\u00e9ro\u00efde.<\/p>\n<figure id=\"attachment_15032\" aria-describedby=\"caption-attachment-15032\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/occ3.jpg\" rel=\"lightbox[15027]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15032\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/occ3-450x338.jpg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/occ3-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/occ3-768x576.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/occ3.jpg 1024w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15032\" class=\"wp-caption-text\">Trajectoire de l&#8217;ombre de l&#8217;ast\u00e9ro\u00efde 2002 TC 302 en Europe et en Am\u00e9rique au cours de l&#8217;occultation de l&#8217;\u00e9toile UCAC4 616-007599 durant la seconde partie de la nuit du 11 novembre 2021 en Europe. Cartes et infos sur<a href=\"https:\/\/www.asteroidoccultation.com\/2021_11\/1111_84522_78628.htm\" target=\"_blank\" rel=\"noopener\"> Asteroidoccultation.com<\/a><\/figcaption><\/figure>\n<p>Autant dire que les mesures r\u00e9alis\u00e9es au cours de l&#8217;occultation du 11 novembre 2021 sont particuli\u00e8rement attendues. R\u00e9ponse la nuit prochaine pour les observateurs situ\u00e9s en Europe et en Am\u00e9rique, en leur souhaitant un ciel d\u00e9gag\u00e9 !<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/09\/22\/2021-sg-linquietant-asteroide-que-personne-na-vu-arriver\/\" target=\"_blank\" rel=\"noopener\">2021 SG, l&#8217;inqui\u00e9tant ast\u00e9ro\u00efde que personne n&#8217;a vu arriver<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/03\/23\/interview-michel-ory-astronome-amateur-et-chasseur-de-cometes\/\" target=\"_blank\" rel=\"noopener\">Interview : Michel Ory, chasseur de com\u00e8tes (et d&#8217;ast\u00e9ro\u00efdes)<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/02\/24\/linstrument-sphere-devoile-la-surface-de-lasteroide-pallas\/\" target=\"_blank\" rel=\"noopener\">L&#8217;instrument SPHERE d\u00e9voile la surface de l&#8217;ast\u00e9ro\u00efde Pallas<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/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>Le 11 novembre avant l&#8217;aube, la lumi\u00e8re d&#8217;une \u00e9toile dans la constellation du Triangle sera masqu\u00e9e par le passage d&#8217;un ast\u00e9ro\u00efde. Des occultations tr\u00e8s utiles : Le 11 novembre 2021, avant que le jour ne se l\u00e8ve en Europe, de nombreux astronomes seront derri\u00e8re leur t\u00e9lescope. Un peu avant 4 heures, ils guetteront l&#8217;extinction de &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/10\/le-11-novembre-une-etoile-va-seteindre-pendant-20-secondes\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Le 11 novembre, une \u00e9toile va s&#8217;\u00e9teindre pendant 20 secondes<\/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":15028,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3126,3127,3128],"class_list":["post-15027","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-asteroide-2002-tc-302","tag-constellation-du-triangle","tag-etoile-ucac4-616-007599"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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