{"id":21728,"date":"2025-10-08T14:13:57","date_gmt":"2025-10-08T14:13:57","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=21728"},"modified":"2025-10-14T15:37:58","modified_gmt":"2025-10-14T15:37:58","slug":"rarissime-ganymede-la-lune-de-jupiter-va-occulter-une-etoile","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/10\/08\/rarissime-ganymede-la-lune-de-jupiter-va-occulter-une-etoile\/","title":{"rendered":"Rarissime : Ganym\u00e8de, la lune de Jupiter, va occulter une \u00e9toile"},"content":{"rendered":"<p><strong>Le 14 octobre 2025 avant l&#8217;aube, Ganym\u00e8de, une lune de Jupiter, doit occulter une \u00e9toile de magnitude 7,5. Un spectacle rarissime.<\/strong><\/p>\n<h5>Satellite galil\u00e9en :<\/h5>\n<p>Tout comme les satellites<a href=\"https:\/\/www.pedagogie.ac-nice.fr\/svt\/productions\/systeme-solaire\/io.htm\" target=\"_blank\" rel=\"noopener\"> Io<\/a>, <a href=\"https:\/\/www.pedagogie.ac-nice.fr\/svt\/productions\/systeme-solaire\/europe.htm\" target=\"_blank\" rel=\"noopener\">Europe<\/a> et <a href=\"https:\/\/www.pedagogie.ac-nice.fr\/svt\/productions\/systeme-solaire\/callisto.htm\" target=\"_blank\" rel=\"noopener\">Callisto<\/a>, Ganym\u00e8de a \u00e9t\u00e9 observ\u00e9 pour la premi\u00e8re fois par <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/06\/galilee-le-savant-qui-a-ouvert-nos-yeux-sur-lunivers\/\" target=\"_blank\" rel=\"noopener\">Galil\u00e9e<\/a> en 1610. Cette lune fut ensuite \u00e9tudi\u00e9e de pr\u00e8s par les sondes <a href=\"https:\/\/science.nasa.gov\/mission\/pioneer-10\/\" target=\"_blank\" rel=\"noopener\">Pioneer 10<\/a> (d\u00e9cembre 1973), puis<a href=\"https:\/\/science.nasa.gov\/mission\/voyager\/\" target=\"_blank\" rel=\"noopener\"> Voyager<\/a> (1979) et <a href=\"https:\/\/science.nasa.gov\/mission\/galileo\/\" target=\"_blank\" rel=\"noopener\">Galileo<\/a> (1995-2002). On a d\u00e9couvert sur un tiers de sa surface des r\u00e9gions sombres tr\u00e8s anciennes fortement crat\u00e9ris\u00e9es. Quant au reste, il est constitu\u00e9 de zones plus claires et plus jeunes travers\u00e9es par de profonds sillons :<\/p>\n<p><iframe loading=\"lazy\" title=\"Juno Flies Past the Moon Ganymede and Jupiter, With Music by Vangelis\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/CC7OJ7gFLvE?start=1&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Il est fort probable qu&#8217;un oc\u00e9an sal\u00e9 se cache \u00e0 100 kilom\u00e8tres de profondeur. L&#8217;ensemble pourrait alors repr\u00e9senter une quantit\u00e9 d\u2019eau sup\u00e9rieure \u00e0 celle des oc\u00e9ans terrestres !<!--more--><\/p>\n<h5>Occultation rarissime :<\/h5>\n<p>Le 14 octobre un peu avant cinq heures du matin, Ganym\u00e8de (<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 5) doit occulter l&#8217;\u00e9toile HIP 37442 (magnitude 7,5). Un ph\u00e9nom\u00e8ne exceptionnel, surtout si l&#8217;on tient compte de la luminosit\u00e9 de l&#8217;\u00e9toile, comme le rappelle <a href=\"http:\/\/josselin.desmars.free.fr\/work\/\" target=\"_blank\" rel=\"noopener\">Josselin Desmars<\/a> :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym1.jpg\" rel=\"lightbox[21728]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21730\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym1-450x335.jpg\" alt=\"\" width=\"450\" height=\"335\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym1-450x335.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym1.jpg 677w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>\u00c0 cette occasion, l&#8217;Observatoire de Paris (<a href=\"https:\/\/observatoiredeparis.psl.eu\/\" target=\"_blank\" rel=\"noopener\">OBSPM-PSL<\/a>) organise avec la <a href=\"https:\/\/saf-astronomie.fr\/\" target=\"_blank\" rel=\"noopener\">SAF<\/a> une nouvelle Action Pluriannuelle Incitative. Cette API est destin\u00e9e \u00e0 associer astronomes amateurs et professionnels. Les volontaires peuvent consulter <a href=\"https:\/\/gemini.obspm.fr\/20250609-occultation-ganymede\/\" target=\"_blank\" rel=\"noopener\">la page d\u00e9di\u00e9e \u00e0 cette occultation<\/a>. Ils y trouveront, entre autres, une <a href=\"https:\/\/lesia.obspm.fr\/lucky-star\/occ.php?p=146057\" target=\"_blank\" rel=\"noopener\">carte interactive<\/a> qui leur permettra de conna\u00eetre les conditions de visibilit\u00e9 pour leur site d&#8217;observation :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/occult2.jpg\" rel=\"lightbox[21728]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21765\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/occult2-450x204.jpg\" alt=\"\" width=\"450\" height=\"204\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/occult2-450x204.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/occult2-768x348.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/occult2.jpg 1002w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Les r\u00e9sultats de cette campagne devraient notamment permettre de mieux pr\u00e9parer les futurs survols de la lune par les sondes <a href=\"https:\/\/www.esa.int\/Science_Exploration\/Space_Science\/Juice\" target=\"_blank\" rel=\"noopener\">Juice<\/a> (ESA) et <a href=\"https:\/\/science.nasa.gov\/mission\/europa-clipper\/\" target=\"_blank\" rel=\"noopener\">Europa Clipper<\/a> (NASA).<\/p>\n<h5>Spectacle pour tous :<\/h5>\n<p>M\u00eame pour les simples curieux, le ph\u00e9nom\u00e8ne est tr\u00e8s int\u00e9ressant (et tr\u00e8s facile) \u00e0 suivre. En effet, une simple longue-vue ou un petit t\u00e9lescope suffisent pour cette observation. La seconde partie de la nuit du 13 au 14 octobre 2025, vous trouverez Jupiter \u00e0 proximit\u00e9 de la Lune (images <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\/ganym3.jpg\" rel=\"lightbox[21728]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21732\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym3-450x255.jpg\" alt=\"\" width=\"450\" height=\"255\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym3-450x255.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym3-1024x580.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym3-768x435.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym3.jpg 1242w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Dans un instrument astronomique, trois des quatre satellites de Jupiter seront visibles, Io passant derri\u00e8re la plan\u00e8te gazeuse. Commencez donc \u00e0 observer vers 4 heures 30 (heure de Paris) pour suivre le rapprochement de l&#8217;\u00e9toile HIP 37442 puis sa disparition derri\u00e8re le satellite jovien :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym4.jpg\" rel=\"lightbox[21728]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21733\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym4-450x260.jpg\" alt=\"\" width=\"450\" height=\"260\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym4-450x260.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym4-1024x592.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym4-768x444.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/10\/ganym4.jpg 1246w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/12\/13\/betelgeuse-une-occultation-riche-en-surprises\/\" target=\"_blank\" rel=\"noopener\">B\u00e9telgeuse : une occultation riche en surprises<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/05\/18\/loccultation-de-jupiter-que-vous-navez-pas-vue\/\" target=\"_blank\" rel=\"noopener\">L\u2019occultation de Jupiter que vous n\u2019avez pas vue<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/12\/08\/en-images-loccultation-de-la-planete-mars-par-la-pleine-lune\/\" target=\"_blank\" rel=\"noopener\">En images : l\u2019occultation de la plan\u00e8te Mars par la Pleine Lune<\/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>Le 14 octobre 2025 avant l&#8217;aube, Ganym\u00e8de, une lune de Jupiter, doit occulter une \u00e9toile de magnitude 7,5. Un spectacle rarissime. Satellite galil\u00e9en : Tout comme les satellites Io, Europe et Callisto, Ganym\u00e8de a \u00e9t\u00e9 observ\u00e9 pour la premi\u00e8re fois par Galil\u00e9e en 1610. Cette lune fut ensuite \u00e9tudi\u00e9e de pr\u00e8s par les sondes Pioneer &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/10\/08\/rarissime-ganymede-la-lune-de-jupiter-va-occulter-une-etoile\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Rarissime : Ganym\u00e8de, la lune de Jupiter, va occulter une \u00e9toile<\/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":21763,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[414,3846,90,3847,106,3328],"class_list":["post-21728","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-ganymede","tag-hip-37442","tag-jupiter","tag-obspm_psl","tag-occultation","tag-saf"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Rarissime : Ganym\u00e8de, la lune de Jupiter, va occulter une \u00e9toile<\/title>\n<meta name=\"description\" content=\"Le 14 octobre 2025 avant l&#039;aube, Ganym\u00e8de, une lune de Jupiter, doit occulter une \u00e9toile de magnitude 7,5. 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