{"id":15309,"date":"2021-12-28T08:49:51","date_gmt":"2021-12-28T08:49:51","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15309"},"modified":"2023-01-25T16:16:12","modified_gmt":"2023-01-25T16:16:12","slug":"dans-le-ciel-de-la-palma-la-comete-leonard-fait-son-show","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/28\/dans-le-ciel-de-la-palma-la-comete-leonard-fait-son-show\/","title":{"rendered":"Dans le ciel de La Palma, la com\u00e8te Leonard fait son show"},"content":{"rendered":"<p><strong>Continuant de s&#8217;approcher du Soleil, la com\u00e8te C\/2021 A1 (Leonard) offre un spectacle \u00e9tonnant depuis l&#8217;\u00eele de La Palma aux Canaries.<\/strong><\/p>\n<h5>Entre volcan et ciel \u00e9toil\u00e9 :<\/h5>\n<p>On a beaucoup parl\u00e9 de La Palma ces derniers mois. C&#8217;est en effet sur cette \u00eele de l&#8217;archipel des Canaries qu&#8217;est entr\u00e9 en \u00e9ruption le <a href=\"https:\/\/www.futura-sciences.com\/planete\/actualites\/volcan-eruption-cumbre-vieja-noel-calme-habitants-palma-5243\/\" target=\"_blank\" rel=\"noopener\">Cumbre Vieja<\/a>. En activit\u00e9 depuis le 19 septembre 2021, le volcan s&#8217;est \u00e9teint un peu avant No\u00ebl. Mais les volcanologues ne sont pas les seuls \u00e0 fr\u00e9quenter cette \u00eele. Les astronomes y ont mis en service depuis 2007 le plus grand t\u00e9lescope optique du monde. Il s&#8217;agit du <a href=\"http:\/\/www.gtc.iac.es\/\" target=\"_blank\" rel=\"noopener\"><em>Gran Telescopio Canarias<\/em><\/a> construit \u00e0 2.400 m\u00e8tres d\u2019altitude :<\/p>\n<figure id=\"attachment_3950\" aria-describedby=\"caption-attachment-3950\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/10\/gtc21.jpg\" rel=\"lightbox[15309]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-3950\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/10\/gtc21-450x252.jpg\" alt=\"\" width=\"450\" height=\"252\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/10\/gtc21-450x252.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/10\/gtc21-1024x574.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/10\/gtc21.jpg 1605w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-3950\" class=\"wp-caption-text\">Le Gran Tecan est construit au sommet de l&#8217;\u00eele de La Palma. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Cet instrument g\u00e9ant (300 tonnes monture comprise) fait partie de l\u2019<em><a href=\"https:\/\/www.iac.es\/en\/observatorios-de-canarias\/roque-de-los-muchachos-observatory\" target=\"_blank\" rel=\"noopener\">Observatoire del Roque de los Muchachos<\/a><\/em>. Sous une coupole de 32 m\u00e8tres de diam\u00e8tre, son miroir primaire est compos\u00e9 de 36 miroirs hexagonaux. La surface collectrice totale est de 75,7 m\u00b2, soit l\u2019\u00e9quivalent d\u2019un miroir sph\u00e9rique de 10,4 m\u00e8tres de diam\u00e8tre.<!--more--><\/p>\n<h5>Com\u00e8te dans un ciel d&#8217;encre :<\/h5>\n<p>Au-dessus des nuages, loin de toute <a href=\"https:\/\/www.futura-sciences.com\/sciences\/questions-reponses\/espace-quest-ce-pollution-lumineuse-12\/\" target=\"_blank\" rel=\"noopener\">pollution lumineuse<\/a>, les astronomes vont cueillir les \u00e9toiles chaque nuit d\u00e9gag\u00e9e. Outre les observateurs professionnels, le sommet de La Palma attire aussi les astrophotographes comme <a href=\"https:\/\/www.voltmer.de\/\" target=\"_blank\" rel=\"noopener\">Sebastian Voltmer<\/a>. Le 26 d\u00e9cembre, ce dernier a r\u00e9alis\u00e9 un magnifique clich\u00e9 de la com\u00e8te C\/2021 A1 (Leonard) :<\/p>\n<figure id=\"attachment_15310\" aria-describedby=\"caption-attachment-15310\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comete_leonard.jpg\" rel=\"lightbox[15309]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15310\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comete_leonard-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comete_leonard-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comete_leonard-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comete_leonard-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comete_leonard.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15310\" class=\"wp-caption-text\">Spectaculaire image de la com\u00e8te C\/2021 A1 (Leonard) r\u00e9alis\u00e9e le 26 d\u00e9cembre depuis l&#8217;\u00eele de La Palma dans l&#8217;archipel des Canaries. \u00a9 <a href=\"https:\/\/www.facebook.com\/SebastianVoltmerPhotography\/\" target=\"_blank\" rel=\"noopener\">Sebastian Voltmer Photography<\/a><\/figcaption><\/figure>\n<p>\u00c0 cette occasion, il a pu immortaliser ce qu&#8217;on appelle un &#8220;\u00e9v\u00e9nement de d\u00e9connexion&#8221; dans la queue de plasma, dont la longueur totale d\u00e9passe les 30\u00b0 ! Explication de ce ph\u00e9nom\u00e8ne sur le site de l&#8217;<a href=\"https:\/\/www.aeronomie.be\/fr\/encyclopedie\/comete-gaz-cometaire-formation-queue-plasma\" target=\"_blank\" rel=\"noopener\">Institut Royal d&#8217;A\u00e9ronomie Spatiale de Belgique<\/a>. Quelques heures plus tard, l&#8217;astrophotographe n&#8217;a pas manqu\u00e9 le passage de la com\u00e8te au-dessus de la coupole du Gran Tecan :<\/p>\n<figure id=\"attachment_15318\" aria-describedby=\"caption-attachment-15318\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comete_leonard-1.jpg\" rel=\"lightbox[15309]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15318\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comete_leonard-1-450x301.jpg\" alt=\"\" width=\"450\" height=\"301\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comete_leonard-1-450x301.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comete_leonard-1-768x514.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comete_leonard-1.jpg 868w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15318\" class=\"wp-caption-text\">La com\u00e8te C\/2021 A1 (Leonard) de passage au-dessus de la coupole du Gran Tecan pendant le weekend de No\u00ebl. \u00a9<a href=\"https:\/\/www.facebook.com\/SebastianVoltmerPhotography\/\" target=\"_blank\" rel=\"noopener\"> Sebastian Voltmer Photography<\/a><\/figcaption><\/figure>\n<p>C\/2021 A1 est sous surveillance depuis le 3 janvier 2021, date de sa d\u00e9couverte par l\u2019astronome <a href=\"https:\/\/catalina.lpl.arizona.edu\/person\/greg-leonard\" target=\"_blank\" rel=\"noopener\">Greg Leonard<\/a>. Apr\u00e8s son passage au plus pr\u00e8s de la Terre (35 millions de kilom\u00e8tres) le 12 d\u00e9cembre, la com\u00e8te poursuit son chemin en direction du Soleil (le p\u00e9rih\u00e9lie est pr\u00e9vu le 3 janvier 2022). L&#8217;astre chevelu devrait donc continuer \u00e0 r\u00e9galer les observateurs d&#8217;Europe du Sud pendant les nuits \u00e0 venir. En esp\u00e9rant qu&#8217;elle ne se d\u00e9sint\u00e8gre pas dans la chaleur solaire, sort qu&#8217;ont connu d&#8217;autres com\u00e8tes dans le pass\u00e9, comme par exemple <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/04\/20\/le-telescope-hubble-le-confirme-la-comete-atlas-sest-brisee\/\" target=\"_blank\" rel=\"noopener\">C\/2019 Y4 (Atlas)<\/a> l&#8217;ann\u00e9e derni\u00e8re.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/12\/28\/une-comete-permet-de-dater-la-mort-dune-imperatrice-byzantine\/\" target=\"_blank\" rel=\"noopener\">Une com\u00e8te permet de dater la mort d\u2019une imp\u00e9ratrice byzantine<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/09\/la-comete-c-2020-m3-atlas-traverse-le-coeur-dorion\/\" target=\"_blank\" rel=\"noopener\">La com\u00e8te C\/2020 M3 (Atlas) traverse le c\u0153ur d\u2019Orion<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/08\/25\/la-comete-neowise-immortalisee-par-le-telescope-hubble\/\" target=\"_blank\" rel=\"noopener\">La com\u00e8te Neowise immortalis\u00e9e par le t\u00e9lescope Hubble<\/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>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/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>Continuant de s&#8217;approcher du Soleil, la com\u00e8te C\/2021 A1 (Leonard) offre un spectacle \u00e9tonnant depuis l&#8217;\u00eele de La Palma aux Canaries. Entre volcan et ciel \u00e9toil\u00e9 : On a beaucoup parl\u00e9 de La Palma ces derniers mois. C&#8217;est en effet sur cette \u00eele de l&#8217;archipel des Canaries qu&#8217;est entr\u00e9 en \u00e9ruption le Cumbre Vieja. En &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/28\/dans-le-ciel-de-la-palma-la-comete-leonard-fait-son-show\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Dans le ciel de La Palma, la com\u00e8te Leonard fait son show<\/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":15310,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2965,1061,3152],"class_list":["post-15309","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-comete-c-2021-a1-leonard","tag-ile-de-la-palma","tag-sebastian-voltmer"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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