{"id":20681,"date":"2025-01-17T16:50:43","date_gmt":"2025-01-17T16:50:43","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=20681"},"modified":"2025-01-25T10:41:28","modified_gmt":"2025-01-25T10:41:28","slug":"observez-un-bel-alignement-planetaire-au-crepuscule","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/01\/17\/observez-un-bel-alignement-planetaire-au-crepuscule\/","title":{"rendered":"Observez un bel alignement plan\u00e9taire au cr\u00e9puscule"},"content":{"rendered":"<p><strong>Depuis quelques jours, les m\u00e9dias annoncent un nouvel alignement plan\u00e9taire. Mais combien de plan\u00e8tes pourrez-vous r\u00e9ellement voir ?\u00a0<\/strong><\/p>\n<h5>G\u00e9om\u00e9trie c\u00e9leste :<\/h5>\n<p>&#8220;Alignement plan\u00e9taire, un ph\u00e9nom\u00e8ne rare&#8221; : vous l&#8217;avez remarqu\u00e9, plusieurs m\u00e9dias relayent cette information. De quoi s&#8217;agit-il ? En raison de leur vitesse de r\u00e9volution (diff\u00e9rente pour chacune), les plan\u00e8tes se retrouvent r\u00e9guli\u00e8rement dans une m\u00eame portion de ciel. Comme elles se d\u00e9placent le long de <a href=\"https:\/\/www.stelvision.com\/astro\/ecliptique\/\" target=\"_blank\" rel=\"noopener\">l&#8217;\u00e9cliptique<\/a>, elles semblent &#8220;align\u00e9es&#8221; d&#8217;Est en Ouest. L&#8217;originalit\u00e9 de ces rendez-vous plan\u00e9taires d\u00e9pend du nombre d&#8217;astres concern\u00e9s et de leur \u00e9cart apparent. Voici ce que l&#8217;on observe au cr\u00e9puscule en ce d\u00e9but d&#8217;ann\u00e9e, immortalis\u00e9 par l&#8217;astrophotographe <a href=\"https:\/\/apod.nasa.gov\/apod\/ap250111.html\" target=\"_blank\" rel=\"noopener\">Dario Giannobile<\/a> :<\/p>\n<figure id=\"attachment_20683\" aria-describedby=\"caption-attachment-20683\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align3.jpg\" rel=\"lightbox[20681]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-20683\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align3-450x257.jpg\" alt=\"\" width=\"450\" height=\"257\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align3-450x257.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align3-1024x585.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align3-768x438.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align3.jpg 1051w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-20683\" class=\"wp-caption-text\">Alignement plan\u00e9taire photographi\u00e9 le 2 janvier 2025 depuis l&#8217;Etna. \u00a9 Dario Giannobile<\/figcaption><\/figure>\n<p>La situation \u00e9volue au fil des soirs : <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/03\/27\/depuis-les-philippines-la-lune-occulte-venus\/\" target=\"_blank\" rel=\"noopener\">V\u00e9nus<\/a> et <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/13\/saturne-dix-ans-dimagerie-depuis-un-balcon-lyonnais\/\" target=\"_blank\" rel=\"noopener\">Saturne<\/a> se rapprochent dans le ciel, et apr\u00e8s le 18 janvier, la plan\u00e8te aux anneaux sera la premi\u00e8re \u00e0 se coucher \u00e0 l&#8217;Ouest. Quant aux plan\u00e8tes les plus brillantes (<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/11\/11\/planete-mars-la-campagne-dobservations-est-lancee\/\" target=\"_blank\" rel=\"noopener\">Mars<\/a>, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/06\/19\/jupiter-lage-de-la-grande-tache-rouge-remis-en-cause\/\" target=\"_blank\" rel=\"noopener\">Jupiter<\/a> et V\u00e9nus), l&#8217;\u00e9cart apparent diminue entre elles. Ce qui nous donnera la disposition suivante le 21 janvier :<\/p>\n<figure id=\"attachment_20684\" aria-describedby=\"caption-attachment-20684\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align2.jpg\" rel=\"lightbox[20681]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-20684\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align2-450x213.jpg\" alt=\"\" width=\"450\" height=\"213\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align2-450x213.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align2-1024x485.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align2-768x364.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-20684\" class=\"wp-caption-text\">Aspect du ciel dans la soir\u00e9e du 21 janvier 2025. \u00a9 <a href=\"https:\/\/stellarium.org\/fr\/\" target=\"_blank\" rel=\"noopener\">Stellarium<\/a><\/figcaption><\/figure>\n<p><!--more--><\/p>\n<h5>Pour \u00eatre visible, il faut briller :<\/h5>\n<p>En th\u00e9orie, six plan\u00e8tes (et bient\u00f4t sept) sont observables. Mais attention, elles n&#8217;ont pas toutes le m\u00eame \u00e9clat. On peut facilement rep\u00e9rer Mars, Jupiter, V\u00e9nus et Saturne m\u00eame en ville. Il n&#8217;en est pas de m\u00eame pour <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/11\/15\/insolite-pointez-uranus-au-plus-pres-de-la-terre\/\" target=\"_blank\" rel=\"noopener\">Uranus<\/a> et <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/20\/comment-reperer-neptune-au-plus-pres-de-la-terre\/\" target=\"_blank\" rel=\"noopener\">Neptune<\/a>, trop peu brillantes, qui n\u00e9cessitent l&#8217;emploi d&#8217;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>. Notez que <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/05\/04\/mercure-devoile-son-impressionnante-queue-de-sodium\/\" target=\"_blank\" rel=\"noopener\">Mercure<\/a> viendra s&#8217;ajouter \u00e0 cette parade apr\u00e8s la mi-f\u00e9vrier, remontant de l&#8217;horizon Ouest pour s&#8217;intercaler entre V\u00e9nus et Saturne. Une sc\u00e8ne qui risque d&#8217;\u00eatre noy\u00e9e dans les lueurs du cr\u00e9puscule :<\/p>\n<figure id=\"attachment_20685\" aria-describedby=\"caption-attachment-20685\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align4.jpg\" rel=\"lightbox[20681]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-20685\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align4-450x302.jpg\" alt=\"\" width=\"450\" height=\"302\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align4-450x302.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align4-1024x688.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align4-768x516.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/align4.jpg 1243w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-20685\" class=\"wp-caption-text\">Disposition des plan\u00e8tes \u00e0 19 heures \u00e0 la fin du mois de f\u00e9vrier 2025. \u00a9 <a href=\"https:\/\/www.stelvision.com\/astro\/carte-ciel\/\" target=\"_blank\" rel=\"noopener\">Stelvision<\/a><\/figcaption><\/figure>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/10\/06\/leclatante-planete-venus-est-de-retour-en-soiree\/\" target=\"_blank\" rel=\"noopener\">L&#8217;\u00e9clatante plan\u00e8te V\u00e9nus est de retour en soir\u00e9e<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/01\/08\/mars-et-ses-lunes-quelques-jours-avant-lopposition\/\" target=\"_blank\" rel=\"noopener\">Mars et ses lunes, quelques jours avant l&#8217;opposition<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/11\/13\/jupiter-un-amateur-surprend-une-brillante-eruption\/\" target=\"_blank\" rel=\"noopener\">Jupiter : un amateur surprend une brillante \u00e9ruption<\/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>Depuis quelques jours, les m\u00e9dias annoncent un nouvel alignement plan\u00e9taire. Mais combien de plan\u00e8tes pourrez-vous r\u00e9ellement voir ?\u00a0 G\u00e9om\u00e9trie c\u00e9leste : &#8220;Alignement plan\u00e9taire, un ph\u00e9nom\u00e8ne rare&#8221; : vous l&#8217;avez remarqu\u00e9, plusieurs m\u00e9dias relayent cette information. De quoi s&#8217;agit-il ? En raison de leur vitesse de r\u00e9volution (diff\u00e9rente pour chacune), les plan\u00e8tes se retrouvent r\u00e9guli\u00e8rement dans &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/01\/17\/observez-un-bel-alignement-planetaire-au-crepuscule\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Observez un bel alignement plan\u00e9taire au cr\u00e9puscule<\/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":20708,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3145,90,116,140,3704,136,128,159],"class_list":["post-20681","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-alignement-planetaire","tag-jupiter","tag-mars","tag-mercure","tag-netune","tag-saturne","tag-uranus","tag-venus"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Observez un bel alignement plan\u00e9taire au cr\u00e9puscule<\/title>\n<meta name=\"description\" content=\"Depuis quelques jours, les m\u00e9dias annoncent un nouvel alignement plan\u00e9taire. 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