{"id":22420,"date":"2026-02-14T17:31:20","date_gmt":"2026-02-14T17:31:20","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=22420"},"modified":"2026-02-25T18:03:48","modified_gmt":"2026-02-25T18:03:48","slug":"nouvelle-eruption-sur-la-comete-29p-schwassmann-wachmann","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/02\/14\/nouvelle-eruption-sur-la-comete-29p-schwassmann-wachmann\/","title":{"rendered":"Nouvelle \u00e9ruption sur la com\u00e8te 29P\/Schwassmann-Wachmann"},"content":{"rendered":"<p><strong>Des amateurs viennent \u00e0 nouveau d&#8217;enregistrer un spectaculaire sursaut d&#8217;\u00e9clat sur l&#8217;\u00e9tonnante com\u00e8te 29P\/Schwassmann-Wachmann.<\/strong><\/p>\n<h5>Impr\u00e9visible com\u00e8te :<\/h5>\n<p>L&#8217;histoire de la com\u00e8te 29P\/Schwassmann-Wachmann (\u00e9ph\u00e9m\u00e9rides <a href=\"https:\/\/astro.vanbuitenen.nl\/comet\/29\" target=\"_blank\" rel=\"noopener\">ici<\/a>) d\u00e9bute le 15 novembre 1927. Cette nuit-l\u00e0, deux astronomes allemands, F. Schwassmann et A. Wachmann d\u00e9couvrent un astre chevelu \u00e0 l\u2019<a href=\"https:\/\/www.physik.uni-hamburg.de\/hs.html\" target=\"_blank\" rel=\"noopener\">Observatoire de Hambourg<\/a>. Les calculs r\u00e9v\u00e8lent qu&#8217;il s&#8217;agit d&#8217;une grosse com\u00e8te d\u2019environ 60 kilom\u00e8tres de diam\u00e8tre qui orbite un peu au del\u00e0 de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/01\/28\/les-tres-belles-images-de-jupiter-au-plus-pres-de-la-terre\/\" target=\"_blank\" rel=\"noopener\">Jupiter<\/a>, avec une p\u00e9riode de 14,7 ans. Mais rapidement, l&#8217;astre chevelu intrigue : il montre de spectaculaires sursauts d&#8217;\u00e9clat, gagnant jusqu&#8217;\u00e0 cinq ou six <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitudes<\/a> en quelques semaines. En 2013, le ph\u00e9nom\u00e8ne a \u00e9t\u00e9 clairement mis en \u00e9vidence par <a href=\"https:\/\/www.damianpeach.com\/\" target=\"_blank\" rel=\"noopener\">Damian Peach<\/a> :<\/p>\n<figure id=\"attachment_14864\" aria-describedby=\"caption-attachment-14864\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/comet-1.jpg\" rel=\"lightbox[22420]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14864\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/comet-1-450x320.jpg\" alt=\"\" width=\"450\" height=\"320\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/comet-1-450x320.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/comet-1-1024x728.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/comet-1-768x546.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/comet-1.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14864\" class=\"wp-caption-text\">\u00c9volution de l&#8217;aspect de la com\u00e8te 29P\/S-W apr\u00e8s une \u00e9ruption en 2013. Un halo de particules glac\u00e9es s&#8217;\u00e9tend autour du noyau entre le 16\/06 et le 28\/07. \u00a9 Damian Peach<\/figcaption><\/figure>\n<p>Pour expliquer ces sursauts d\u2019\u00e9clat, les astronomes \u00e9voquent le <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Cryovolcan\" target=\"_blank\" rel=\"noopener\">cryovolcanisme<\/a>. Lorsque la surface gel\u00e9e du noyau de la com\u00e8te se fracture, elle laisse \u00e9chapper de la glace et des poussi\u00e8res. Un ph\u00e9nom\u00e8ne qui s\u2019observe \u00e9galement sur diverses lunes glac\u00e9es comme <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Ganym%C3%A8de_(lune)\" target=\"_blank\" rel=\"noopener\">Ganym\u00e8de<\/a> ou <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Encelade_(lune)\" target=\"_blank\" rel=\"noopener\">Encelade<\/a>. <!--more--><\/p>\n<h5>Nouvelle \u00e9ruption :<\/h5>\n<p>L\u2019astronome\u00a0<a href=\"https:\/\/britastro.org\/forums\/users\/richard-miles\" target=\"_blank\" rel=\"noopener\">Richard Miles<\/a> s\u2019int\u00e9resse depuis plusieurs ann\u00e9es au comportement de la com\u00e8te 29P\/S-W. Il a rassembl\u00e9 toutes les informations \u00e0 son sujet dans <a href=\"https:\/\/britastro.org\/node\/25120\" target=\"_blank\" rel=\"noopener\">Mission 29P<\/a>. On y apprend ainsi qu&#8217;une nouvelle \u00e9ruption vient de se produire. Et pas des moindres : c&#8217;est l&#8217;une des plus puissantes de ces 25 derni\u00e8res ann\u00e9es. La com\u00e8te est en effet devenue cent fois plus brillante, passant de la magnitude 17 \u00e0 la magnitude 12. C&#8217;est l&#8217;astrophotographe <a href=\"https:\/\/spaceweathergallery2.com\/indiv_upload.php?upload_id=230907\" target=\"_blank\" rel=\"noopener\">Eliot Herman<\/a> qui le premier a donn\u00e9 l&#8217;alerte le 10 f\u00e9vrier, suivi par d&#8217;autres amateurs :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/02\/comet-1.jpg\" rel=\"lightbox[22420]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-22421\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/02\/comet-1-450x367.jpg\" alt=\"\" width=\"450\" height=\"367\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/02\/comet-1-450x367.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/02\/comet-1-768x626.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/02\/comet-1.jpg 1011w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Chaque \u00e9ruption est pr\u00e9c\u00e9d\u00e9e d&#8217;une baisse d\u2019\u00e9clat de la com\u00e8te, signe que la cro\u00fbte du noyau est devenue herm\u00e9tique \u00e0 tout d\u00e9gazage. Quand la pression devient trop forte, la surface finit par c\u00e9der. Dans les semaines qui suivent, on peut alors observer autour du noyau de la com\u00e8te l&#8217;expansion d&#8217;un halo de particules glac\u00e9es (comme ce fut le cas en 2013, voir plus haut). Un spectacle que les astrophotographes bien \u00e9quip\u00e9s sont invit\u00e9s \u00e0 immortaliser.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/02\/07\/lexplosion-dune-comete-aurait-decime-des-peuples-amerindiens\/\" target=\"_blank\" rel=\"noopener\">L\u2019explosion d\u2019une com\u00e8te aurait d\u00e9cim\u00e9 des peuples Am\u00e9rindiens<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/28\/dans-le-ciel-de-la-palma-la-comete-leonard-fait-son-show\/\" target=\"_blank\" rel=\"noopener\">Dans le ciel de La Palma, la com\u00e8te Leonard fait son show<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/23\/en-avril-1066-le-retour-de-la-comete-de-halley-fut-exceptionnel\/\" target=\"_blank\" rel=\"noopener\">En 1066, le passage de la com\u00e8te de Halley fut exceptionnel<\/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>Des amateurs viennent \u00e0 nouveau d&#8217;enregistrer un spectaculaire sursaut d&#8217;\u00e9clat sur l&#8217;\u00e9tonnante com\u00e8te 29P\/Schwassmann-Wachmann. Impr\u00e9visible com\u00e8te : L&#8217;histoire de la com\u00e8te 29P\/Schwassmann-Wachmann (\u00e9ph\u00e9m\u00e9rides ici) d\u00e9bute le 15 novembre 1927. Cette nuit-l\u00e0, deux astronomes allemands, F. Schwassmann et A. Wachmann d\u00e9couvrent un astre chevelu \u00e0 l\u2019Observatoire de Hambourg. Les calculs r\u00e9v\u00e8lent qu&#8217;il s&#8217;agit d&#8217;une grosse com\u00e8te &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/02\/14\/nouvelle-eruption-sur-la-comete-29p-schwassmann-wachmann\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Nouvelle \u00e9ruption sur la com\u00e8te 29P\/Schwassmann-Wachmann<\/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":14864,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3928,3396,3929,3115],"class_list":["post-22420","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-29p-schwassmann-wachmann","tag-comete-29p-s-w","tag-eliot-herman","tag-richard-miles"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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