{"id":19176,"date":"2024-03-17T17:26:29","date_gmt":"2024-03-17T17:26:29","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=19176"},"modified":"2024-04-07T08:26:25","modified_gmt":"2024-04-07T08:26:25","slug":"surveillez-betelgeuse-sa-luminosite-decroit-de-nouveau","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/03\/17\/surveillez-betelgeuse-sa-luminosite-decroit-de-nouveau\/","title":{"rendered":"Surveillez B\u00e9telgeuse, sa luminosit\u00e9 d\u00e9cro\u00eet de nouveau !"},"content":{"rendered":"<p><strong>B\u00e9telgeuse conna\u00eet une nouvelle baisse de luminosit\u00e9 depuis la fin du mois de janvier. Que nous pr\u00e9pare la plus c\u00e9l\u00e8bre superg\u00e9ante rouge ?<\/strong><\/p>\n<h5>Vedette impr\u00e9visible :<\/h5>\n<p>S&#8217;il y a une \u00e9toile que tout le monde conna\u00eet, c&#8217;est bien B\u00e9telgeuse. Elle fait r\u00e9guli\u00e8rement l&#8217;actualit\u00e9, que ce soit en \u00e9tant <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/12\/13\/betelgeuse-une-occultation-riche-en-surprises\/\" target=\"_blank\" rel=\"noopener\">occult\u00e9e par un ast\u00e9ro\u00efde<\/a>, ou lorsqu&#8217;elle est victime d&#8217;un <a href=\"https:\/\/www.futura-sciences.com\/sciences\/breves\/etoile-baisse-luminosite-betelgeuse-haute-resolution-comme-vous-ne-avez-jamais-vue-8893\/\" target=\"_blank\" rel=\"noopener\">grand obscurcissement<\/a>. Depuis environ deux mois, celle qui symbolise l\u2019une des \u00e9paules du chasseur <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/05\/10\/a-pompei-une-mosaique-illustre-le-mythe-dorion-et-du-scorpion\/\" target=\"_blank\" rel=\"noopener\">Orion<\/a> perd de nouveau lentement de son \u00e9clat, 1\/2 <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> pour \u00eatre pr\u00e9cis. Pas \u00e9tonnant pour une variable semi-r\u00e9guli\u00e8re, mais l&#8217;astre n&#8217;avait pas autant baiss\u00e9 depuis deux ans. Que faut-il en penser ?<\/p>\n<p>https:\/\/twitter.com\/_NotreEspace_\/status\/1768875869555056738<\/p>\n<p>Cet astre devrait finir par exploser en <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-supernova-60\/\" target=\"_blank\" rel=\"noopener\">supernova<\/a>, devenant visible en plein jour ! Un spectacle qui peut avoir lieu la nuit prochaine comme dans 100.000 ans (lire <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/etoile-il-passe-betelgeuse-satellite-meteo-tout-vu-79164\/#betelgeuse-sa-baisse-de-luminosite-decryptee-par-s\" target=\"_blank\" rel=\"noopener\">l\u2019avis de l\u2019astrophysicienne Sylvie Vauclair<\/a>). \u00c0 moins que cela ne soit d\u00e9j\u00e0 fait : c&#8217;est ce que sugg\u00e8re <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/etoile-si-etoile-betelgeuse-avait-deja-explose-supernova-109470\/\" target=\"_blank\" rel=\"noopener\">une \u00e9quipe internationale d&#8217;astrophysiciens<\/a>. Quoi qu&#8217;il en soit, les sautes d\u2019humeur de cette \u00e9toile g\u00e9ante rouge sont connues depuis longtemps. On en trouve la trace dans les r\u00e9cits que se transmettent les Aborig\u00e8nes d\u2019Australie (lire sur <a href=\"https:\/\/arxiv.org\/abs\/1808.01862\" target=\"_blank\" rel=\"noopener noreferrer\">arXiv<\/a>).<\/p>\n<figure id=\"attachment_11121\" aria-describedby=\"caption-attachment-11121\" style=\"width: 300px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/orion2.jpg\" rel=\"lightbox[19176]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11121\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/orion2-300x450.jpg\" alt=\"\" width=\"300\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/orion2-300x450.jpg 300w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/orion2-768x1151.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/orion2-683x1024.jpg 683w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/orion2.jpg 1001w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-11121\" class=\"wp-caption-text\">Un autre regard sur la n\u00e9buleuse d&#8217;Orion. Notez la couleur orang\u00e9e de B\u00e9telgeuse.\u00a0 \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p><!--more--><\/p>\n<h5>\u00c9toile sous surveillance :<\/h5>\n<p>Les variabilistes sont sp\u00e9cialis\u00e9s dans la mesure des modifications de luminosit\u00e9 des <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-etoile-variable-301\/\" target=\"_blank\" rel=\"noopener\">\u00e9toiles variables<\/a>. La plupart sont regroup\u00e9s au sein de l&#8217;<a href=\"https:\/\/www.aavso.org\/\" target=\"_blank\" rel=\"noopener\">AAVSO<\/a>, l&#8217;association am\u00e9ricaine des observateurs d&#8217;\u00e9toiles variables, fond\u00e9e en 1911. Ils proc\u00e8dent par comparaisons visuelles avec des \u00e9toiles voisines de magnitude connue. Avec de l&#8217;entra\u00eenement, ils parviennent \u00e0 d\u00e9celer des variations de 1\/10\u00e8me de magnitude ! Les membres de l&#8217;association vont d\u00e9sormais surveiller l&#8217;\u00e9paule d&#8217;Orion avec beaucoup d&#8217;attention :<\/p>\n<figure id=\"attachment_18743\" aria-describedby=\"caption-attachment-18743\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse2.jpg\" rel=\"lightbox[19176]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-18743\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse2-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse2-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse2-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse2-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-18743\" class=\"wp-caption-text\">B\u00e9telgeuse est l&#8217;une des plus brillantes \u00e9toiles du ciel. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Mais comme B\u00e9telgeuse est l&#8217;une des plus brillantes \u00e9toiles du ciel, sa surveillance est une activit\u00e9 accessible \u00e0 tous, rien qu&#8217;avec les deux yeux. Voil\u00e0 pourquoi <em><a href=\"https:\/\/skyandtelescope.org\/astronomy-news\/is-betelgeuse-fading-again\/?\" target=\"_blank\" rel=\"noopener\">Sky and Telescope<\/a><\/em> nous explique comment s&#8217;y prendre en faisant des comparaisons d&#8217;\u00e9clat avec Procyon et Ald\u00e9baran. Une activit\u00e9 qui peut m\u00eame se d\u00e9rouler en ville, o\u00f9 ces trois astres restent encore visibles malgr\u00e9 la <a href=\"https:\/\/www.futura-sciences.com\/sciences\/questions-reponses\/espace-quest-ce-pollution-lumineuse-12\/\" target=\"_blank\" rel=\"noopener\">pollution lumineuse<\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/12\/13\/betelgeuse-une-occultation-riche-en-surprises\/\" target=\"_blank\" rel=\"noopener\">B\u00e9telgeuse : une occultation riche en surprises<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/03\/16\/conseils-realisez-votre-premiere-photo-de-la-nebuleuse-dorion\/\" target=\"_blank\" rel=\"noopener\">Comment r\u00e9aliser votre premi\u00e8re photo de la n\u00e9buleuse d\u2019Orion<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/05\/05\/la-constellation-dorion-se-couche-depuis-les-iles-andaman\/\" target=\"_blank\" rel=\"noopener\">La constellation d\u2019Orion se couche depuis les \u00eeles Andaman<\/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>.<\/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>B\u00e9telgeuse conna\u00eet une nouvelle baisse de luminosit\u00e9 depuis la fin du mois de janvier. Que nous pr\u00e9pare la plus c\u00e9l\u00e8bre superg\u00e9ante rouge ? Vedette impr\u00e9visible : S&#8217;il y a une \u00e9toile que tout le monde conna\u00eet, c&#8217;est bien B\u00e9telgeuse. Elle fait r\u00e9guli\u00e8rement l&#8217;actualit\u00e9, que ce soit en \u00e9tant occult\u00e9e par un ast\u00e9ro\u00efde, ou lorsqu&#8217;elle est &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/03\/17\/surveillez-betelgeuse-sa-luminosite-decroit-de-nouveau\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Surveillez B\u00e9telgeuse, sa luminosit\u00e9 d\u00e9cro\u00eet de nouveau !<\/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":19177,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[344,3548,354,980,403],"class_list":["post-19176","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-betelgeuse","tag-brice-haziza","tag-constellation-dorion","tag-geante-rouge","tag-supernova"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Surveillez B\u00e9telgeuse, sa luminosit\u00e9 d\u00e9cro\u00eet de nouveau !<\/title>\n<meta name=\"description\" content=\"B\u00e9telgeuse conna\u00eet une nouvelle baisse de luminosit\u00e9 depuis la fin du mois de janvier. 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