{"id":11789,"date":"2020-04-07T06:11:45","date_gmt":"2020-04-07T06:11:45","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11789"},"modified":"2020-04-18T10:33:33","modified_gmt":"2020-04-18T10:33:33","slug":"la-prometteuse-comete-atlas-sest-elle-desintegree","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/04\/07\/la-prometteuse-comete-atlas-sest-elle-desintegree\/","title":{"rendered":"La prometteuse com\u00e8te Atlas s&#8217;est-elle d\u00e9sint\u00e9gr\u00e9e ?"},"content":{"rendered":"<p><strong>Attendue comme l&#8217;astre chevelu le plus brillant depuis deux d\u00e9cennies, la com\u00e8te Atlas donne des signes de faiblesse ces derni\u00e8res nuits.<\/strong><\/p>\n<p>D\u00e9couverte fin 2019, la com\u00e8te C\/2019 Y4 (Atlas) \u00e9tait sur les l\u00e8vres de tous les astronomes. Sa\u00a0 taille d\u00e9mesur\u00e9e (une chevelure de 720.000 kilom\u00e8tres de diam\u00e8tre le 24 mars et une queue de gaz et de poussi\u00e8re longue de 3,3 millions de kilom\u00e8tres d\u00e9but avril) ainsi que l&#8217;augmentation r\u00e9guli\u00e8re de sa luminosit\u00e9 laissaient esp\u00e9rer un beau spectacle. Avec une orbite tr\u00e8s similaire \u00e0 celle de la \u00ab grande com\u00e8te de 1844 \u00bb, C\/2019 Y4 aurait m\u00eame pu atteindre la luminosit\u00e9 de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/04\/01\/venus-va-a-la-rencontre-des-pleiades-comme-il-y-a-huit-ans\/\" target=\"_blank\" rel=\"noopener noreferrer\">V\u00e9nus<\/a> au mois de mai.<\/p>\n<figure id=\"attachment_11790\" aria-describedby=\"caption-attachment-11790\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas.jpg\" rel=\"lightbox[11789]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11790\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas-450x250.jpg\" alt=\"\" width=\"450\" height=\"250\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas-450x250.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas-1024x569.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas-768x427.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas-672x372.jpg 672w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas-1038x576.jpg 1038w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas.jpg 1130w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-11790\" class=\"wp-caption-text\">Les derni\u00e8res images de la com\u00e8te Atlas montrent un allongement de son noyau qui laisse pr\u00e9sager de sa d\u00e9sint\u00e9gration. \u00a9 Ningbo Education Xinjiang Telescope<\/figcaption><\/figure>\n<p>Malheureusement il semble que l&#8217;aspect de la com\u00e8te se soit modifi\u00e9 ces derni\u00e8res nuits, laissant pr\u00e9sager une possible fragmentation de son noyau.<!--more--><\/p>\n<p>Sur sa page Facebook, L&#8217;astronome amateur <a href=\"https:\/\/www.facebook.com\/patrick.sogorb.5\" target=\"_blank\" rel=\"noopener noreferrer\">Patrick Sogorb<\/a> \u00e9crivait il y a quelques heures : <em>il semble qu&#8217;un \u00e9v\u00e9nement majeur se soit pass\u00e9 sur la com\u00e8te C\/2019 Y4 (Atlas). Depuis quelques jours, la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener noreferrer\">magnitude<\/a> diminue au lieu d&#8217;augmenter, et les r\u00e9sidus astrom\u00e9triques augmentent (6 arcs\/sec aujourd&#8217;hui). Deux messages de &#8220;<a href=\"http:\/\/www.astronomerstelegram.org\/?read=13620\" target=\"_blank\" rel=\"noopener noreferrer\">The Astronomer&#8217;s Telegram<\/a>&#8221; indiquent que le noyau n&#8217;est plus ponctuel, mais allong\u00e9 d&#8217;environ 3 arcs\/sec, ce qui est la preuve que le noyau se d\u00e9sagr\u00e8ge&#8230; Le grand spectacle du mois prochain ne sera peut-\u00eatre pas aussi beau que pr\u00e9vu<\/em>.<\/p>\n<figure id=\"attachment_11791\" aria-describedby=\"caption-attachment-11791\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas2.jpg\" rel=\"lightbox[11789]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11791\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas2-450x306.jpg\" alt=\"\" width=\"450\" height=\"306\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas2-450x306.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas2.jpg 730w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-11791\" class=\"wp-caption-text\">La com\u00e8te Atlas photographi\u00e9e le 28 mars. \u00a9 Tim Connolly<\/figcaption><\/figure>\n<p>Un sc\u00e9nario qu&#8217;avait d\u00e9j\u00e0 envisag\u00e9 Karl Battams (de l&#8217;<a href=\"https:\/\/www.nrl.navy.mil\/\" target=\"_blank\" rel=\"noopener noreferrer\"><em>US Naval Research Laboratory<\/em><\/a>) sur le site <a href=\"https:\/\/spaceweather.com\/\" target=\"_blank\" rel=\"noopener noreferrer\"><em>SpaceWeather.com<\/em><\/a> : <em>je ne serais pas surpris de voir la com\u00e8te Atlas commencer \u00e0 s&#8217;estomper rapidement et peut-\u00eatre m\u00eame se d\u00e9sint\u00e9grer avant d&#8217;atteindre le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/02\/06\/le-soleil-se-couche-sur-le-desert-datacama\/\" target=\"_blank\" rel=\"noopener noreferrer\">Soleil<\/a>. J&#8217;esp\u00e8re sinc\u00e8rement me tromper, mais son comportement rappelle beaucoup celui de la <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-bref-comete-elenin-disparu-33844\/\" target=\"_blank\" rel=\"noopener noreferrer\">com\u00e8te Elenin<\/a> il y a quelques ann\u00e9es&#8230;<\/em><\/p>\n<p><iframe loading=\"lazy\" title=\"com\u00e8te C2019 Y4 ATLAS 3h20 en 30 secondes avril 2020\" width=\"474\" height=\"356\" src=\"https:\/\/www.youtube.com\/embed\/nSZ2E8uSPto?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Attendue de pied ferme en octobre 2011 comme une com\u00e8te spectaculaire, Elenin avait en effet \u00e9t\u00e9 victime d&#8217;une \u00e9ruption solaire fatale qui avait bris\u00e9 son noyau deux mois plus t\u00f4t. Une m\u00e9saventure que vient \u00e9galement de conna\u00eetre la com\u00e8te interstellaire\u00a0 <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/comete-interstellaire-comete-interstellaire-2i-borisov-fragmentee-80210\/\" target=\"_blank\" rel=\"noopener noreferrer\">2I\/Borisov<\/a>&#8230;<\/p>\n<h5><strong>Mise \u00e0 jour du 14 avril<\/strong><\/h5>\n<p>On a d\u00e9sormais la certitude que la com\u00e8te s&#8217;est bris\u00e9e en plusieurs morceaux :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas-1.jpg\" rel=\"lightbox[11789]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-11839\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas-1-450x444.jpg\" alt=\"\" width=\"450\" height=\"444\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas-1-450x444.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/atlas-1.jpg 719w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/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>Attendue comme l&#8217;astre chevelu le plus brillant depuis deux d\u00e9cennies, la com\u00e8te Atlas donne des signes de faiblesse ces derni\u00e8res nuits. D\u00e9couverte fin 2019, la com\u00e8te C\/2019 Y4 (Atlas) \u00e9tait sur les l\u00e8vres de tous les astronomes. Sa\u00a0 taille d\u00e9mesur\u00e9e (une chevelure de 720.000 kilom\u00e8tres de diam\u00e8tre le 24 mars et une queue de gaz &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/04\/07\/la-prometteuse-comete-atlas-sest-elle-desintegree\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La prometteuse com\u00e8te Atlas s&#8217;est-elle d\u00e9sint\u00e9gr\u00e9e ?<\/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":11790,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2802,2801],"class_list":["post-11789","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-c-2019-y4-atlas","tag-comete-atlas"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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