{"id":23114,"date":"2026-08-13T14:26:04","date_gmt":"2026-08-13T14:26:04","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=23114"},"modified":"2026-08-13T14:26:04","modified_gmt":"2026-08-13T14:26:04","slug":"la-comete-220p-mcnaught-prend-de-court-les-astronomes","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/08\/13\/la-comete-220p-mcnaught-prend-de-court-les-astronomes\/","title":{"rendered":"La com\u00e8te 220P\/McNaught prend de court les astronomes"},"content":{"rendered":"<p><strong>Pour la seconde fois en quelques semaines, la com\u00e8te 220P\/McNaught a connu une brusque augmentation de luminosit\u00e9.<\/strong><\/p>\n<h5>Astre chevelu impr\u00e9visible :<\/h5>\n<p>On ne s&#8217;ennuie pas en observant la com\u00e8te 220P\/McNaught (param\u00e8tres sur <a href=\"https:\/\/astro.vanbuitenen.nl\/comet\/220\" target=\"_blank\" rel=\"noopener\">Astro.Vanbuitenen<\/a>). Elle vient de conna\u00eetre une seconde \u00e9ruption (entre le 4 et le 5 ao\u00fbt), qui a multipli\u00e9 sa luminosit\u00e9 par environ 650. La fois pr\u00e9c\u00e9dente, fin mai, la luminosit\u00e9 avait \u00e9t\u00e9 multipli\u00e9e par 7000 !\u00a0 Bien connu, le responsable de ces sursauts d&#8217;\u00e9clat est le <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Cryovolcan\" target=\"_blank\" rel=\"noopener\">cryovolcanisme<\/a>. Lorsque la surface gel\u00e9e de l&#8217;astre chevelu devient herm\u00e9tique \u00e0 tout d\u00e9gazage, elle finit par c\u00e9der sous la pression. Le noyau se fracture, laissant \u00e9chapper de la glace et des poussi\u00e8res. On observe alors une brutale augmentation d&#8217;\u00e9clat et l\u2019expansion d\u2019un halo de particules glac\u00e9es. C\u2019est bien ce qu\u2019a photographi\u00e9 <a href=\"https:\/\/www.facebook.com\/photo\/?fbid=27992805820330068&amp;set=gm.2885956801574763&amp;idorvanity=123943134442824\" target=\"_blank\" rel=\"noopener\">Nirmal Paul<\/a> :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/08\/comet2.jpg\" rel=\"lightbox[23114]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-23116\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/08\/comet2-450x428.jpg\" alt=\"\" width=\"450\" height=\"428\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/08\/comet2-450x428.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/08\/comet2-1024x974.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/08\/comet2-768x730.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/08\/comet2.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Visible actuellement dans la <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Baleine_(constellation)\" target=\"_blank\" rel=\"noopener\">constellation de la Baleine<\/a> (non loin de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/07\/13\/insolite-la-station-spatiale-du-cote-de-saturne\/\" target=\"_blank\" rel=\"noopener\">Saturne<\/a>), l&#8217;astre chevelu est d\u00e9sormais observable avec une simple paire de jumelles. Son d\u00e9couvreur n&#8217;est autre que <a href=\"https:\/\/en.wikipedia.org\/wiki\/Robert_H._McNaught\" target=\"_blank\" rel=\"noopener\">Robert H. McNaught<\/a>. Cet astronome scotto-australien n&#8217;en est pas \u00e0 son coup d&#8217;essai, puisqu&#8217;on lui doit notamment la <a href=\"https:\/\/www.eso.org\/public\/switzerland-fr\/images\/mc_naught42\/?lang\" target=\"_blank\" rel=\"noopener\">Grande com\u00e8te C2006\/P1<\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/06\/06\/deces-de-alan-hale-co-decouvreur-de-la-comete-hale-bopp\/\" target=\"_blank\" rel=\"noopener\">Co-d\u00e9couvreur de la com\u00e8te Hale-Bopp, Alan Hale est d\u00e9c\u00e9d\u00e9<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/05\/14\/spectacle-la-comete-c-2025-r3-panstarrs-du-cote-dorion\/\" target=\"_blank\" rel=\"noopener\">Spectacle : la com\u00e8te C\/2025 R3 (PANSTARRS) du c\u00f4t\u00e9 d\u2019Orion<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/08\/27\/comete-interstellaire-3i-atlas-les-explications-dadrien-coffinet\/\" target=\"_blank\" rel=\"noopener\">Com\u00e8te interstellaire 3I\/ATLAS : les explications d\u2019Adrien Coffinet<\/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>Pour la seconde fois en quelques semaines, la com\u00e8te 220P\/McNaught a connu une brusque augmentation de luminosit\u00e9. Astre chevelu impr\u00e9visible : On ne s&#8217;ennuie pas en observant la com\u00e8te 220P\/McNaught (param\u00e8tres sur Astro.Vanbuitenen). Elle vient de conna\u00eetre une seconde \u00e9ruption (entre le 4 et le 5 ao\u00fbt), qui a multipli\u00e9 sa luminosit\u00e9 par environ 650. &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/08\/13\/la-comete-220p-mcnaught-prend-de-court-les-astronomes\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La com\u00e8te 220P\/McNaught prend de court 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":23115,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[4004,93,4005,4006],"class_list":["post-23114","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-220p-mcnaught","tag-comete","tag-nirmal-paul","tag-robert-h-mcnaught"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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