{"id":18770,"date":"2023-12-13T12:36:47","date_gmt":"2023-12-13T12:36:47","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=18770"},"modified":"2023-12-30T16:56:38","modified_gmt":"2023-12-30T16:56:38","slug":"betelgeuse-une-occultation-riche-en-surprises","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/12\/13\/betelgeuse-une-occultation-riche-en-surprises\/","title":{"rendered":"B\u00e9telgeuse : une occultation riche en surprises"},"content":{"rendered":"<p><strong>Les astronomes font un premier bilan de l&#8217;occultation de B\u00e9telgeuse par l&#8217;ast\u00e9ro\u00efde (319) Leona qui s&#8217;est produite le 12 d\u00e9cembre.<\/strong><\/p>\n<h5>\u00c9v\u00e9nement astronomique :<\/h5>\n<p>Ils se souviendront de cette nuit du 12 d\u00e9cembre. Leurs t\u00e9lescopes point\u00e9s vers B\u00e9telgeuse, amateurs et professionnels ont guett\u00e9 l&#8217;\u00e9clipse de <em>\u03b1 Orionis<\/em>. La principale \u00e9toile de la\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/23\/en-images-la-majestueuse-constellation-dorion\/\" target=\"_blank\" rel=\"noopener\">constellation d\u2019Orion<\/a> devait en effet \u00eatre cach\u00e9e pendant une dizaine de secondes par l&#8217;ast\u00e9ro\u00efde (319) Leona. La plupart des observateurs, des habitu\u00e9s d&#8217;occultations d&#8217;\u00e9toiles par des ast\u00e9ro\u00efdes, s&#8217;\u00e9taient positionn\u00e9s \u00e0 l&#8217;int\u00e9rieur d&#8217;une bande de visibilit\u00e9 allant du Mexique jusqu&#8217;\u00e0 l&#8217;Ouest de la Chine. Pour une fois, leur cible \u00e9tait particuli\u00e8rement brillante, ce qui a n\u00e9cessit\u00e9 quelques adaptations. Certains ont opt\u00e9 pour des masques \u00e0 l&#8217;avant du t\u00e9lescope de fa\u00e7on \u00e0 ne pas saturer le capteur de leur cam\u00e9ra :<\/p>\n<figure id=\"attachment_18772\" aria-describedby=\"caption-attachment-18772\" style=\"width: 447px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult2.jpg\" rel=\"lightbox[18770]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-18772\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult2-447x450.jpg\" alt=\"\" width=\"447\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult2-447x450.jpg 447w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult2-1017x1024.jpg 1017w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult2-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult2-768x774.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult2-1525x1536.jpg 1525w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult2.jpg 1536w\" sizes=\"auto, (max-width: 447px) 100vw, 447px\" \/><\/a><figcaption id=\"caption-attachment-18772\" class=\"wp-caption-text\">Masque \u00e0 l&#8217;avant d&#8217;un t\u00e9lescope pour diminuer l&#8217;\u00e9clat de B\u00e9telgeuse. \u00a9 <a href=\"https:\/\/www.facebook.com\/photo\/?fbid=10230889120361881&amp;set=pcb.10230889103681464\" target=\"_blank\" rel=\"noopener\">Claudio Costa<\/a><\/figcaption><\/figure>\n<p>Rappelons que (319) Leona est un ast\u00e9ro\u00efde mesurant environ 70X60 km. De <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 14, il circule entre les orbites de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/11\/08\/une-nouvelle-grotte-photographiee-sur-mars\/\" target=\"_blank\" rel=\"noopener\">Mars<\/a> et <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/11\/29\/jupiter-le-declin-de-la-grande-tache-rouge-en-images\/\" target=\"_blank\" rel=\"noopener\">Jupiter<\/a>. Il fut d\u00e9couvert \u00e0 l\u2019<a href=\"https:\/\/www.oca.eu\/fr\/\" target=\"_blank\" rel=\"noopener\">Observatoire de Nice<\/a> en 1891 par l&#8217;astronome Auguste Charlois.<!--more--><\/p>\n<h5>Premiers r\u00e9sultats, premi\u00e8res surprises :<\/h5>\n<p>Les astronomes ont commenc\u00e9 \u00e0 partager leurs r\u00e9sultats sur la page de l&#8217;<em>International Occultation Timing Association<\/em> (<a href=\"https:\/\/call4obs.iota-es.de\/observations-of-the-occultation-of-betelgeuse-by-319-leona?\" target=\"_blank\" rel=\"noopener\">IOTA<\/a>). Il va falloir prendre le temps de d\u00e9pouiller ces mesures, mais on peut d\u00e9j\u00e0 faire quelques constatations :<\/p>\n<ul>\n<li>Tous les observateurs ont assist\u00e9 au mieux \u00e0 une baisse d&#8217;\u00e9clat de B\u00e9telgeuse, mais l&#8217;\u00e9toile est toujours rest\u00e9e visible \u00e0 l&#8217;\u0153il nu. On devrait donc plut\u00f4t parler de transit de (319) Leona devant <em>\u03b1 Orionis\u00a0<\/em>puisque l&#8217;ast\u00e9ro\u00efde n&#8217;est jamais parvenu \u00e0 masquer compl\u00e8tement l&#8217;\u00e9toile :<\/li>\n<\/ul>\n<figure id=\"attachment_18773\" aria-describedby=\"caption-attachment-18773\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult3.jpg\" rel=\"lightbox[18770]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18773 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult3-450x249.jpg\" alt=\"\" width=\"450\" height=\"249\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult3-450x249.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult3-1024x567.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult3-768x425.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult3-672x372.jpg 672w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult3-1038x576.jpg 1038w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult3.jpg 1155w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-18773\" class=\"wp-caption-text\">Variation de l&#8217;\u00e9clat de B\u00e9telgeuse durant le transit de (319) Leona. \u00a9 <a href=\"https:\/\/www.facebook.com\/photo?fbid=850158920446224&amp;set=a.125874146208042\" target=\"_blank\" rel=\"noopener\">Sebastian Voltmer<\/a><\/figcaption><\/figure>\n<ul>\n<li>Lorsque des astronomes observent des occultations, ils se r\u00e9partissent dans la largeur (et un peu au del\u00e0) de la bande de visibilit\u00e9 du ph\u00e9nom\u00e8ne. La largeur de cette bande est calcul\u00e9e \u00e0 partir des dimensions (connues ou estim\u00e9es) de l&#8217;ast\u00e9ro\u00efde occulteur. Chacun peut ainsi mesurer une &#8220;corde&#8221;, qui correspond \u00e0 la longueur de l&#8217;ast\u00e9ro\u00efde vu depuis son emplacement. Malgr\u00e9 tout, le 12 d\u00e9cembre, plusieurs astronomes plac\u00e9s dans la moiti\u00e9 Nord de la bande de visibilit\u00e9 ont fait une observation n\u00e9gative. Curieusement, ils n&#8217;ont pas eu droit \u00e0 une baisse d&#8217;\u00e9clat de B\u00e9telgeuse :<\/li>\n<\/ul>\n<figure id=\"attachment_18783\" aria-describedby=\"caption-attachment-18783\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/cloud.jpg\" rel=\"lightbox[18770]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18783 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/cloud-450x219.jpg\" alt=\"\" width=\"450\" height=\"219\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/cloud-450x219.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/cloud-1024x498.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/cloud-768x374.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/cloud.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-18783\" class=\"wp-caption-text\">Position des observateurs dans la bande de visibilit\u00e9 au Sud de l&#8217;Espagne.<\/figcaption><\/figure>\n<ul>\n<li>Enfin, rappelons que l&#8217;objectif de cette mission \u00e9tait d\u2019obtenir des informations sur la localisation des \u00e9normes <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-convection-hors-norme-betelgeuse-23272\/\" target=\"_blank\" rel=\"noopener\">cellules convectives<\/a> de l&#8217;\u00e9toile. Leur pr\u00e9sence devrait se traduire par des diff\u00e9rences de luminosit\u00e9 \u00e0 la surface de l&#8217;astre. Mais pour l&#8217;instant, les courbes photom\u00e9triques ne r\u00e9v\u00e8lent aucune anomalie :<\/li>\n<\/ul>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult4.jpg\" rel=\"lightbox[18770]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-18774\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult4-450x224.jpg\" alt=\"\" width=\"450\" height=\"224\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult4-450x224.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult4-1024x510.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult4-768x383.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult4-1536x765.jpg 1536w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/occult4.jpg 1554w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Le d\u00e9pouillement de l&#8217;ensemble des donn\u00e9es acquises fera l&#8217;objet de publications ult\u00e9rieures, mais il semble qu&#8217;il nous reste encore beaucoup \u00e0 apprendre sur B\u00e9telgeuse et (319) Leona. En tout cas, ce rendez-vous c\u00e9leste aura \u00e9t\u00e9 une nouvelle fois l&#8217;occasion d&#8217;une belle coop\u00e9ration entre amateurs et professionnels.<\/p>\n<p style=\"text-align: center\">Merci \u00e0 <strong>St\u00e9phane Neveu<\/strong> (<a href=\"https:\/\/saf-astronomie.fr\/techniques-astronomie-amateur\/\" target=\"_blank\" rel=\"noopener\">Commission des Techniques en Astronomie Amateur<\/a> de la <a href=\"https:\/\/saf-astronomie.fr\/\" target=\"_blank\" rel=\"noopener\">SAF<\/a>) pour sa relecture et ses suggestions.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/12\/07\/loccultation-de-betelgeuse-sannonce-exceptionnelle\/\" target=\"_blank\" rel=\"noopener\">L\u2019occultation de B\u00e9telgeuse s\u2019annonce exceptionnelle<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/03\/16\/conseils-realisez-votre-premiere-photo-de-la-nebuleuse-dorion\/\" target=\"_blank\" rel=\"noopener\">Comment r\u00e9aliser votre premi\u00e8re photo de la n\u00e9buleuse d\u2019Orion<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/05\/05\/la-constellation-dorion-se-couche-depuis-les-iles-andaman\/\" target=\"_blank\" rel=\"noopener\">La constellation d\u2019Orion se couche depuis les \u00eeles Andaman<\/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>Les astronomes font un premier bilan de l&#8217;occultation de B\u00e9telgeuse par l&#8217;ast\u00e9ro\u00efde (319) Leona qui s&#8217;est produite le 12 d\u00e9cembre. \u00c9v\u00e9nement astronomique : Ils se souviendront de cette nuit du 12 d\u00e9cembre. Leurs t\u00e9lescopes point\u00e9s vers B\u00e9telgeuse, amateurs et professionnels ont guett\u00e9 l&#8217;\u00e9clipse de \u03b1 Orionis. La principale \u00e9toile de la\u00a0constellation d\u2019Orion devait en effet &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/12\/13\/betelgeuse-une-occultation-riche-en-surprises\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">B\u00e9telgeuse : une occultation riche en surprises<\/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":18771,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[344,3498,106,3497],"class_list":["post-18770","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-betelgeuse","tag-iota","tag-occultation","tag--orionis"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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