{"id":2289,"date":"2015-03-23T20:43:50","date_gmt":"2015-03-23T20:43:50","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2289"},"modified":"2015-03-29T06:47:29","modified_gmt":"2015-03-29T06:47:29","slug":"explosion-dune-etoile-dans-la-constellation-du-sagittaire","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/23\/explosion-dune-etoile-dans-la-constellation-du-sagittaire\/","title":{"rendered":"Explosion d&#8217;une \u00e9toile dans la constellation du Sagittaire"},"content":{"rendered":"<p>Une nouvelle \u00e9toile serait-elle n\u00e9e dans le <a title=\"Mars et le Sagittaire\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/10\/31\/mars-sagittaire\/\" target=\"_blank\">Sagittaire\u00a0<\/a>? C&#8217;est ce que pourrait laisser penser l&#8217;observation de cette constellation o\u00f9 brille un astre de magnitude 4,4 qui n&#8217;y \u00e9tait pas avant.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova5.jpg\" rel=\"lightbox[2289]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-2295\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova5-450x364.jpg\" alt=\"nova5\" width=\"450\" height=\"364\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova5-450x364.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova5-1024x829.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova5.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Il s&#8217;agit en r\u00e9alit\u00e9 d&#8217;une nova, une \u00e9toile qui augmente brutalement d&#8217;\u00e9clat pendant quelques jours. Elle a \u00e9t\u00e9 remarqu\u00e9e pour la premi\u00e8re fois par l&#8217;astronome amateur australien John Seach le 15 mars.<\/p>\n<p><!--more-->Sa luminosit\u00e9 continue de cro\u00eetre depuis sa d\u00e9couverte, faisant de <em>nova Sagittarii<\/em> 2015 n\u00b02 la plus brillante nova observ\u00e9e depuis 2 ans.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova3.jpg\" rel=\"lightbox[2289]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-2293\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova3-450x273.jpg\" alt=\"nova3\" width=\"450\" height=\"273\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova3-450x273.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova3.jpg 759w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Pour 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>, une nova appara\u00eet lorsqu&#8217;une \u00e9toile se rapproche trop pr\u00e8s d&#8217;une naine blanche, un compagnon stellaire qui lui arrache alors de l&#8217;hydrog\u00e8ne et de l&#8217;h\u00e9lium. En tombant sur la naine blanche, ces gaz comprim\u00e9s et surchauff\u00e9s d\u00e9clenchent une violente explosion, provoquant un bref (quelques jours) mais intense sursaut d&#8217;\u00e9clat (jusqu&#8217;\u00e0 10 magnitudes!).<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova21.jpg\" rel=\"lightbox[2289]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-2298\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova21-450x450.jpg\" alt=\"nova2\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova21-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova21-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/nova21.jpg 900w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Vous pouvez tenter de rep\u00e9rer cette nova assez basse sur l&#8217;horizon avec une paire de jumelles un peu avant l&#8217;aube.<\/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>Une nouvelle \u00e9toile serait-elle n\u00e9e dans le Sagittaire\u00a0? C&#8217;est ce que pourrait laisser penser l&#8217;observation de cette constellation o\u00f9 brille un astre de magnitude 4,4 qui n&#8217;y \u00e9tait pas avant. Il s&#8217;agit en r\u00e9alit\u00e9 d&#8217;une nova, une \u00e9toile qui augmente brutalement d&#8217;\u00e9clat pendant quelques jours. Elle a \u00e9t\u00e9 remarqu\u00e9e pour la premi\u00e8re fois par l&#8217;astronome &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/23\/explosion-dune-etoile-dans-la-constellation-du-sagittaire\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Explosion d&#8217;une \u00e9toile dans la constellation du Sagittaire<\/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":2294,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[496,89,192,922,921],"class_list":["post-2289","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-constellation-du-sagittaire","tag-etoile","tag-magnitude","tag-naine-blanche","tag-nova"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Explosion d&#039;une \u00e9toile dans la constellation du Sagittaire<\/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\/23\/explosion-dune-etoile-dans-la-constellation-du-sagittaire\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Explosion d&#039;une \u00e9toile dans la constellation du Sagittaire\" \/>\n<meta property=\"og:description\" content=\"Une nouvelle \u00e9toile serait-elle n\u00e9e dans le Sagittaire\u00a0? C&#8217;est ce que pourrait laisser penser l&#8217;observation de cette constellation o\u00f9 brille un astre de magnitude 4,4 qui n&#8217;y \u00e9tait pas avant. Il s&#8217;agit en r\u00e9alit\u00e9 d&#8217;une nova, une \u00e9toile qui augmente brutalement d&#8217;\u00e9clat pendant quelques jours. 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