{"id":21687,"date":"2025-09-27T10:07:02","date_gmt":"2025-09-27T10:07:02","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=21687"},"modified":"2025-10-07T16:43:21","modified_gmt":"2025-10-07T16:43:21","slug":"la-prometteuse-comete-lemmon-est-de-plus-en-plus-belle","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/09\/27\/la-prometteuse-comete-lemmon-est-de-plus-en-plus-belle\/","title":{"rendered":"La prometteuse com\u00e8te Lemmon est de plus en plus belle"},"content":{"rendered":"<p><strong>C&#8217;est la com\u00e8te \u00e0 ne pas manquer ! C\/2025 A6 (Lemmon) devient de plus en plus brillante, et le spectacle est d\u00e9j\u00e0 au rendez-vous.<\/strong><\/p>\n<h5>Surprise automnale :<\/h5>\n<p>On n&#8217;ose pas encore trop y croire, mais la com\u00e8te C\/2025 A6 (Lemmon) pourrait faire tourner la t\u00eate des astronomes d&#8217;ici quelques semaines. La preuve avec cette superbe image r\u00e9alis\u00e9e par <a href=\"https:\/\/app.astrobin.com\/i\/lsnen5\" target=\"_blank\" rel=\"noopener\">Julien De Winter<\/a> le 26 septembre avec une lunette <a href=\"https:\/\/www.astronome.fr\/lunettes-astronomiques\/3128-lunette-askar-fra600-f56.html\" target=\"_blank\" rel=\"noopener\">ASKAR FRA600<\/a> et plus d&#8217;une heure de poses cumul\u00e9es. On constate que le<a href=\"https:\/\/www.aeronomie.be\/fr\/encyclopedie\/vent-solaire-flux-particules-chargees-sechappant-soleil\" target=\"_blank\" rel=\"noopener\"> vent solaire<\/a> produit d\u00e9j\u00e0 d&#8217;importantes perturbations dans la queue de plasma :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet5.jpg\" rel=\"lightbox[21687]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21688\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet5-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet5-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet5-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet5-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet5.jpg 1502w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Pourtant, l&#8217;astre chevelu est encore loin : son passage au plus pr\u00e8s de la Terre (0,68\u00a0<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Unit%C3%A9_astronomique\" target=\"_blank\" rel=\"noopener\">UA<\/a>) n&#8217;est pas pr\u00e9vu avant le 21 octobre, et le <a href=\"https:\/\/fr.wikipedia.org\/wiki\/P%C3%A9rih%C3%A9lie\" target=\"_blank\" rel=\"noopener\">p\u00e9rih\u00e9lie<\/a> se produira le 8 novembre. Initialement, la luminosit\u00e9 de la com\u00e8te devait atteindre la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 10. Mais l&#8217;astre chevelu est beaucoup plus actif que pr\u00e9vu, obligeant les astronomes \u00e0 revoir leurs pr\u00e9visions. Il y a un mois, <a href=\"http:\/\/www.aerith.net\/comet\/catalog\/2025A6\/2025A6.html\" target=\"_blank\" rel=\"noopener\">Seiichi Yoshida<\/a> pr\u00e9voyait une magnitude maximale de 4. Valeur que <a href=\"https:\/\/cometografia.es\/cometas-visibles\/?\" target=\"_blank\" rel=\"noopener\">Pepe Chambo<\/a> fixe d\u00e9sormais \u00e0 2 !<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet2.jpg\" rel=\"lightbox[21687]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21689\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet2-450x263.jpg\" alt=\"\" width=\"450\" height=\"263\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet2-450x263.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet2-1024x600.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet2-768x450.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet2.jpg 1163w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Une chose est certaine : si l&#8217;astre chevelu ne se d\u00e9sint\u00e8gre pas en s&#8217;approchant du Soleil dans les semaines \u00e0 venir, il va faire le buzz !<\/p>\n<h5>Com\u00e8te au Nord :<\/h5>\n<p>Actuellement, C\/2025 A6 (Lemmon) est observable en fin de nuit dans le <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Lynx_(constellation)\" target=\"_blank\" rel=\"noopener\">Lynx<\/a>. Comme l&#8217;explique <a href=\"https:\/\/starwalk.space\/fr\/news\/c2025-a6-lemmon-next-comet-visible-from-earth-2025\" target=\"_blank\" rel=\"noopener\">Star Walk<\/a>, la com\u00e8te va filer en direction du <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Serpent_(constellation)\" target=\"_blank\" rel=\"noopener\">Serpent<\/a> en passant par le <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Bouvier_(constellation)\" target=\"_blank\" rel=\"noopener\">Bouvier<\/a>. Le 16 octobre, elle sera juste \u00e0 c\u00f4t\u00e9 de <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Alpha_Canum_Venaticorum\" target=\"_blank\" rel=\"noopener\">Cor Caroli<\/a>, la c\u00e9l\u00e8bre \u00e9toile double des <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Chiens_de_chasse\" target=\"_blank\" rel=\"noopener\">Chiens de Chasse<\/a> :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet3.jpg\" rel=\"lightbox[21687]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21690\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet3-450x244.jpg\" alt=\"\" width=\"450\" height=\"244\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet3-450x244.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet3-1024x555.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet3-768x416.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet3.jpg 1076w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Pour localiser la com\u00e8te avec son smartphone, on peut aussi t\u00e9l\u00e9charger une application comme <a href=\"https:\/\/stellarium.org\/fr\/\" target=\"_blank\" rel=\"noopener\">Stellarium<\/a>. Actuellement de magnitude 7, l&#8217;astre chevelu est rep\u00e9rable aux <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/11\/13\/les-yeux-de-hibou-detonnantes-jumelles\/\" target=\"_blank\" rel=\"noopener\">jumelles<\/a>. Si tout se passe bien, sa d\u00e9tection \u00e0 l&#8217;\u0153il nu ne devrait pas poser de probl\u00e8me fin octobre. Voil\u00e0 un joli spectacle qui s&#8217;annonce !<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/03\/14\/splendeurs-dans-le-sillage-de-la-comete-12p-pons-brooks\/\" target=\"_blank\" rel=\"noopener\">Splendeurs dans le sillage de la com\u00e8te 12P\/Pons-Brooks<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/09\/02\/la-comete-nishimura-assaillie-par-le-vent-solaire\/\" target=\"_blank\" rel=\"noopener\">La com\u00e8te Nishimura assaillie par le vent solaire<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/01\/29\/les-exocometes-sont-nombreuses-autour-des-etoiles\/\" target=\"_blank\" rel=\"noopener\">Les exocom\u00e8tes sont nombreuses autour des \u00e9toiles<\/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>\u00a0et sur\u00a0<a href=\"https:\/\/bsky.app\/profile\/cielmania.bsky.social\" target=\"_blank\" rel=\"noopener\">Bluesky<\/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>C&#8217;est la com\u00e8te \u00e0 ne pas manquer ! C\/2025 A6 (Lemmon) devient de plus en plus brillante, et le spectacle est d\u00e9j\u00e0 au rendez-vous. Surprise automnale : On n&#8217;ose pas encore trop y croire, mais la com\u00e8te C\/2025 A6 (Lemmon) pourrait faire tourner la t\u00eate des astronomes d&#8217;ici quelques semaines. La preuve avec cette superbe &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/09\/27\/la-prometteuse-comete-lemmon-est-de-plus-en-plus-belle\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La prometteuse com\u00e8te Lemmon est de plus en plus belle<\/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":21688,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3813,93,3843,618],"class_list":["post-21687","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-c-2025-a6-lemmon","tag-comete","tag-julien-de-winter","tag-vent-solaire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La prometteuse com\u00e8te Lemmon est de plus en plus belle<\/title>\n<meta name=\"description\" content=\"C&#039;est la com\u00e8te \u00e0 ne pas manquer ! 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