{"id":2011,"date":"2015-03-02T06:18:39","date_gmt":"2015-03-02T06:18:39","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2011"},"modified":"2015-03-08T10:04:07","modified_gmt":"2015-03-08T10:04:07","slug":"c2015-d1-la-comete-qui-defie-le-soleil-et-les-astronomes","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/02\/c2015-d1-la-comete-qui-defie-le-soleil-et-les-astronomes\/","title":{"rendered":"C\/2015 D1, la com\u00e8te qui d\u00e9fie le Soleil et les astronomes"},"content":{"rendered":"<p>Le 18 f\u00e9vrier dernier, une com\u00e8te a fait son apparition dans le champ du coronographe de l&#8217;observatoire solaire <a title=\"Soho\" href=\"http:\/\/sohowww.nascom.nasa.gov\/\" target=\"_blank\">SOHO<\/a>. \u00a0Fruit d&#8217;une collaboration entre l&#8217;<a title=\"ESA\" href=\"http:\/\/www.esa.int\/fre\/ESA_in_your_country\/France\" target=\"_blank\">ESA<\/a> et la <a title=\"NASA\" href=\"http:\/\/www.nasa.gov\/\" target=\"_blank\">NASA<\/a>, \u00a0SOHO (<em>SOlar and Heliospheric Observatory)<\/em> observe l&#8217;activit\u00e9 solaire en continu depuis son lancement le 4 d\u00e9cembre 1995.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/soho.jpg\" rel=\"lightbox[2011]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-2012\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/soho-450x323.jpg\" alt=\"soho\" width=\"450\" height=\"323\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/soho-450x323.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/soho-1024x735.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/soho.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Il dispose notamment d&#8217;un coronographe Lasco (<em>Large Angle and Spectrometric Coronagraph<\/em>) dont le disque occulteur masque notre \u00e9toile, ne laissant voir que les r\u00e9gions environnantes pour y suivre le d\u00e9veloppement des <a title=\"En vid\u00e9o : 5 ans d\u2019images du Soleil avec l\u2019observatoire SDO\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/19\/en-video-5-ans-dimages-du-soleil-avec-sdo\/\" target=\"_blank\">\u00e9ruptions solaires<\/a>\u00a0(image ci-dessus).<\/p>\n<p><!--more-->Cet instrument s&#8217;est \u00e9galement r\u00e9v\u00e9l\u00e9 \u00eatre un redoutable d\u00e9tecteur de <a title=\"Swan et Lovejoy, deux com\u00e8tes qui se ressemblent\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/24\/swan-et-lovejoy-deux-cometes-qui-se-ressemblent\/\" target=\"_blank\">com\u00e8tes<\/a>, plus de 2800 \u00e0 ce jour\u00a0! Ces astres chevelus sont pour la plupart des membres du groupe de Kreutz, des morceaux d&#8217;une ancienne com\u00e8te g\u00e9ante bris\u00e9e qui circulent sur des orbites dont le p\u00e9rih\u00e9lie est tr\u00e8s proche du <a title=\"20 mars : ne manquez pas l\u2019\u00e9clipse partielle de Soleil\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/28\/20-mars-ne-manquez-pas-leclipse-partielle-de-soleil\/\" target=\"_blank\">Soleil<\/a>. La plupart de ces morceaux com\u00e9taires finissent vaporis\u00e9s \u00e0 proximit\u00e9 de notre \u00e9toile ou plongent dedans.<\/p>\n<p>La 2875 \u00e8me com\u00e8te d\u00e9couverte dans le champ du coronographe Lasco le 19 f\u00e9vrier dernier (com\u00e8te nomm\u00e9e C\/2015 D1) a \u00e9chapp\u00e9 \u00e0 la fournaise solaire malgr\u00e9 un passage \u00e0 3,5 millions de kilom\u00e8tres de notre \u00e9toile\u00a0; elle poursuit sa route \u00e0 travers la constellation de <a title=\"Androm\u00e8de et P\u00e9gase\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/08\/22\/andromede-pegase\/\" target=\"_blank\">P\u00e9gase <\/a>apr\u00e8s un bref passage \u00e0 proximit\u00e9 du tandem <a title=\"Les plan\u00e8tes V\u00e9nus et Mars s\u2019alignent au cr\u00e9puscule\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/23\/les-planetes-venus-et-mars-salignent-au-crepuscule\/\" target=\"_blank\">Mars-V\u00e9nus<\/a>.<\/p>\n<p>En reconstituant son orbite les <a title=\"Lumi\u00e8re rouge pour les astronomes\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\">astronomes <\/a>ont eu la surprise de constater que cette com\u00e8te ne fait pas partie du groupe de Kreutz ou d&#8217;aucun autre groupe de com\u00e8tes. C\/2015 D1 est une com\u00e8te solitaire, comme c&#8217;est le cas chaque ann\u00e9e pour quelques-uns des nombreux astres chevelus d\u00e9couverts.<\/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 18 f\u00e9vrier dernier, une com\u00e8te a fait son apparition dans le champ du coronographe de l&#8217;observatoire solaire SOHO. \u00a0Fruit d&#8217;une collaboration entre l&#8217;ESA et la NASA, \u00a0SOHO (SOlar and Heliospheric Observatory) observe l&#8217;activit\u00e9 solaire en continu depuis son lancement le 4 d\u00e9cembre 1995. Il dispose notamment d&#8217;un coronographe Lasco (Large Angle and Spectrometric Coronagraph) &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/02\/c2015-d1-la-comete-qui-defie-le-soleil-et-les-astronomes\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">C\/2015 D1, la com\u00e8te qui d\u00e9fie le Soleil et les astronomes<\/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":2012,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[870,93,868,392,523,869,486,760,97],"class_list":["post-2011","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-c2015-d1","tag-comete","tag-coronographe","tag-eruption-solaire","tag-esa","tag-groupe-de-kreutz","tag-nasa","tag-soho","tag-soleil"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\/2015 D1, la com\u00e8te qui d\u00e9fie le Soleil et les astronomes<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/02\/c2015-d1-la-comete-qui-defie-le-soleil-et-les-astronomes\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\/2015 D1, la com\u00e8te qui d\u00e9fie le Soleil et les astronomes\" \/>\n<meta property=\"og:description\" content=\"Le 18 f\u00e9vrier dernier, une com\u00e8te a fait son apparition dans le champ du coronographe de l&#8217;observatoire solaire SOHO. \u00a0Fruit d&#8217;une collaboration entre l&#8217;ESA et la NASA, \u00a0SOHO (SOlar and Heliospheric Observatory) observe l&#8217;activit\u00e9 solaire en continu depuis son lancement le 4 d\u00e9cembre 1995. 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