{"id":21769,"date":"2025-10-12T15:40:13","date_gmt":"2025-10-12T15:40:13","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=21769"},"modified":"2025-10-22T09:07:57","modified_gmt":"2025-10-22T09:07:57","slug":"la-comete-lemmon-est-desormais-observable-en-soiree","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/10\/12\/la-comete-lemmon-est-desormais-observable-en-soiree\/","title":{"rendered":"La com\u00e8te Lemmon est d\u00e9sormais observable en soir\u00e9e"},"content":{"rendered":"<p><strong>Apr\u00e8s son passage sous la Grande Ourse, la com\u00e8te C\/2025 A6 (Lemmon) devient d\u00e9sormais observable \u00e0 la tomb\u00e9e de la nuit.\u00a0<\/strong><\/p>\n<h5>La vedette du mois :<\/h5>\n<p>La com\u00e8te Lemmon mobilise d\u00e9sormais la communaut\u00e9 astronomique. Les astrophotographes, bien s\u00fbr, comme <a href=\"https:\/\/www.facebook.com\/photo?fbid=10235568390007788&amp;set=a.1291482844604\" target=\"_blank\" rel=\"noopener\">Petr Hor\u00e1lek<\/a>, qui a immortalis\u00e9 C\/2025 A6 malgr\u00e9 la lumi\u00e8re de la Lune :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon4.jpg\" rel=\"lightbox[21769]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21772\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon4-450x450.jpg\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon4-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon4-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon4-768x768.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon4.jpg 1000w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>D&#8217;autres, comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/10\/07\/spectacle-la-comete-lemmon-du-cote-de-la-galaxie-ngc-3184\/\" target=\"_blank\" rel=\"noopener\">St\u00e9phane Vetter<\/a> ou <a href=\"https:\/\/www.facebook.com\/photo\/?fbid=10162418383424032&amp;set=a.10150155509129032\" target=\"_blank\" rel=\"noopener\">Roger Menard<\/a>, ont fait le choix de la photographier avec leur t\u00e9lescope. Il y a m\u00eame certains irr\u00e9ductibles qui la dessinent ! \u00c0 l&#8217;\u00e9poque des cam\u00e9ras et des appareils photos num\u00e9riques, ils continuent d&#8217;utiliser des crayons, \u00e0 la mani\u00e8re de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/12\/17\/la-lune-en-couleurs-letonnant-dessin-de-lucien-rudaux\/\" target=\"_blank\" rel=\"noopener\">Lucien Rudaux<\/a>. C&#8217;est le cas par exemple de <a href=\"https:\/\/www.facebook.com\/photo?fbid=2557311581293784&amp;set=gm.2594506080719838&amp;idorvanity=123943134442824\" target=\"_blank\" rel=\"noopener\">David Graham<\/a>, qui a saisi de nombreux jets de gaz et de poussi\u00e8re en train de s&#8217;\u00e9chapper du noyau de l&#8217;astre chevelu :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon3.jpg\" rel=\"lightbox[21769]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21771\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon3-321x450.jpg\" alt=\"\" width=\"321\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon3-321x450.jpg 321w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon3-731x1024.jpg 731w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon3-768x1075.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon3.jpg 857w\" sizes=\"auto, (max-width: 321px) 100vw, 321px\" \/><\/a><\/p>\n<p>Son travail rappelle celui men\u00e9 en 2023 par l&#8217;astrodessinatrice Leonor Ana Hernandez sur la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/27\/la-comete-ztf-croquee-par-une-astrodessinatrice\/\" target=\"_blank\" rel=\"noopener\">com\u00e8te ZTF<\/a>.<\/p>\n<h5>Com\u00e8te du soir :<\/h5>\n<p>D\u00e9sormais, la com\u00e8te Lemmon, dont l&#8217;\u00e9clat continue d&#8217;augmenter, est observable en d\u00e9but de nuit \u00e9galement. Comme elle est assez basse au-dessus de l&#8217;horizon Nord, je vous conseille d&#8217;utiliser une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/11\/13\/les-yeux-de-hibou-detonnantes-jumelles\/\" target=\"_blank\" rel=\"noopener\">paire de jumelles<\/a> pour la rep\u00e9rer plus facilement. La carte ci-dessous vous montre sa trajectoire, que j&#8217;ai ajout\u00e9e sur un fond du ciel nocturne fourni par <a href=\"https:\/\/stellarium-web.org\/\" target=\"_blank\" rel=\"noopener\">Stellarium<\/a> :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon5.jpg\" rel=\"lightbox[21769]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21775\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon5-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon5-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon5-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon5-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/lemmon5.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Apr\u00e8s \u00eatre pass\u00e9e sous la <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Grande_Ourse\" target=\"_blank\" rel=\"noopener\">Grande Ourse<\/a>, elle file en direction du <a href=\"https:\/\/www.ciel-de-nuit.com\/constellation-du-bouvier\" target=\"_blank\" rel=\"noopener\">Bouvier<\/a>. Le 16 octobre, elle sera facile \u00e0 trouver, 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\u00a0<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Chiens_de_chasse\" target=\"_blank\" rel=\"noopener\">Chiens de Chasse<\/a>. Et comme nous nous dirigeons vers la Nouvelle Lune (le 21), toutes les conditions sont r\u00e9unies pour admirer la belle voyageuse !<\/p>\n<h5>\u00c0 savoir :<\/h5>\n<p>C\/2025 A6 a \u00e9t\u00e9 d\u00e9couverte le 3 janvier 2025 \u00e0 l\u2019<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Observatoire_du_mont_Lemmon\" target=\"_blank\" rel=\"noopener\">Observatoire du Mont Lemmon<\/a>\u00a0avec une\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a>\u00a0de 21,6. Nomm\u00e9e CCNG6P2 dans un premier temps, elle a re\u00e7u sa d\u00e9signation d\u00e9finitive une fois sa nature com\u00e9taire confirm\u00e9e. Les astronomes ont calcul\u00e9 que sa p\u00e9riode orbitale est d\u2019environ 1372 ans. 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>) est fix\u00e9 au 21 octobre, et le\u00a0<a href=\"https:\/\/fr.wikipedia.org\/wiki\/P%C3%A9rih%C3%A9lie\" target=\"_blank\" rel=\"noopener\">p\u00e9rih\u00e9lie<\/a> au 8 novembre. Depuis sa d\u00e9couverte, la com\u00e8te fait preuve d&#8217;une importante activit\u00e9 de d\u00e9gazage. Les astronomes ont donc revu r\u00e9guli\u00e8rement \u00e0 la hausse sa courbe d&#8217;\u00e9clat pr\u00e9visionnel. Elle devrait avoir une magnitude comprise entre 2 et 3 \u00e0 la fin du mois d&#8217;octobre.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/comet5.jpg\" rel=\"lightbox[21769]\"><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>Mais attention, n&#8217;esp\u00e9rez pas voir aux jumelles ce que les photographies nous montrent : les capteurs num\u00e9riques font des miracles !<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/09\/27\/la-prometteuse-comete-lemmon-est-de-plus-en-plus-belle\/\" target=\"_blank\" rel=\"noopener\">La prometteuse com\u00e8te Lemmon est de plus en plus belle<\/a><\/li>\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<\/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>Apr\u00e8s son passage sous la Grande Ourse, la com\u00e8te C\/2025 A6 (Lemmon) devient d\u00e9sormais observable \u00e0 la tomb\u00e9e de la nuit.\u00a0 La vedette du mois : La com\u00e8te Lemmon mobilise d\u00e9sormais la communaut\u00e9 astronomique. Les astrophotographes, bien s\u00fbr, comme Petr Hor\u00e1lek, qui a immortalis\u00e9 C\/2025 A6 malgr\u00e9 la lumi\u00e8re de la Lune : D&#8217;autres, comme &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/10\/12\/la-comete-lemmon-est-desormais-observable-en-soiree\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La com\u00e8te Lemmon est d\u00e9sormais observable en soir\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":21775,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3813,3849,3538],"class_list":["post-21769","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-c-2025-a6-lemmon","tag-comete-lemmon","tag-stellarium"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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