{"id":17269,"date":"2023-01-21T14:50:27","date_gmt":"2023-01-21T14:50:27","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=17269"},"modified":"2023-01-26T17:27:30","modified_gmt":"2023-01-26T17:27:30","slug":"comete-ztf-ce-quen-pense-lastronome-alan-hale","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/21\/comete-ztf-ce-quen-pense-lastronome-alan-hale\/","title":{"rendered":"Com\u00e8te ZTF : ce qu&#8217;en pense l&#8217;astronome Alan Hale"},"content":{"rendered":"<p><strong>Alors que les m\u00e9dias s&#8217;emballent avec l&#8217;arriv\u00e9e de la com\u00e8te C\/2022 E3 (ZTF), l&#8217;astronome Alan Hale nous rappelle ce qu&#8217;il en est exactement.<\/strong><\/p>\n<h5>Un nom accroch\u00e9 au firmament :<\/h5>\n<p>Si vous aimez les astres chevelus, le nom d&#8217;Alan Hale (lire sa <a href=\"http:\/\/www.earthriseinstitute.org\/ahbio.html\" target=\"_blank\" rel=\"noopener\">biographie<\/a> en anglais) vous dit forc\u00e9ment quelque chose. Le 23 juillet 1995, cet astronome am\u00e9ricain d\u00e9couvrait (ind\u00e9pendamment de l&#8217;amateur <a href=\"https:\/\/skyandtelescope.org\/astronomy-news\/people-places-and-events\/thomas-bopp-1949-2018\/\" target=\"_blank\" rel=\"noopener\">Thomas Bopp<\/a>, d\u00e9c\u00e9d\u00e9 en 2018), la com\u00e8te <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/04\/02\/printemps-1997-la-comete-hale-bopp-illumine-le-ciel\/\" target=\"_blank\" rel=\"noopener\">C\/1995 O1<\/a>. Celle qui devint la plus brillante com\u00e8te du XXe si\u00e8cle fut visible pendant 18 mois \u00e0 l&#8217;\u0153il nu, atteignant la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> -1 lors de son passage au p\u00e9rih\u00e9lie en avril 1997 :<\/p>\n<figure id=\"attachment_15738\" aria-describedby=\"caption-attachment-15738\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp.jpg\" rel=\"lightbox[17269]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15738\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp-450x258.jpg\" alt=\"\" width=\"450\" height=\"258\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp-450x258.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp-1024x588.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp-768x441.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp.jpg 1106w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15738\" class=\"wp-caption-text\">La com\u00e8te Hale-Bopp d\u00e9ploie ses deux queues au printemps 1997. \u00a9 Jerry Lodriguss<\/figcaption><\/figure>\n<p>Dans un <a href=\"https:\/\/www.facebook.com\/alan.hale.18400\/posts\/pfbid02GXQnLPF8vsifYJS5nWjvRT4NvAyG8y9CJfhzCWfV4DvvLiT2XTR6ZeijCox6xhtdl\" target=\"_blank\" rel=\"noopener\">long message<\/a> post\u00e9 sur Facebook, Alan Hale rappelle quelques v\u00e9rit\u00e9s scientifiques sur la com\u00e8te C\/2022 E3 (ZTF), loin de tout sensationnalisme.<!--more--><\/p>\n<h5>L&#8217;avis d&#8217;un sp\u00e9cialiste :<\/h5>\n<p>Ayant observ\u00e9 visuellement plusieurs centaines de com\u00e8tes au cours des cinq derni\u00e8res d\u00e9cennies, A. Hale peut l\u00e9gitimement revendiquer le titre d&#8217;expert en com\u00e8tes. Voici un r\u00e9sum\u00e9 de son message :<\/p>\n<p><em>&#8220;Beaucoup d&#8217;entre vous ont probablement vu des reportages sur une com\u00e8te lumineuse qui est maintenant pr\u00eate \u00e0 appara\u00eetre dans notre ciel nocturne<\/em> (il s&#8217;agit de C\/2022 E3 ZTF)<em>.<\/em><em> Des gros titres comme \u00abRare com\u00e8te verte qui traverse le ciel\u00bb ou \u00ab\u00c9v\u00e9nement qui arrive une fois dans une civilisation\u00bb ont fleuri un peu partout. Pour ceux que \u00e7a int\u00e9resse, voici quelques pr\u00e9cisions :<\/em><\/p>\n<figure id=\"attachment_17271\" aria-describedby=\"caption-attachment-17271\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/hale.jpg\" rel=\"lightbox[17269]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-17271\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/hale-450x367.jpg\" alt=\"\" width=\"450\" height=\"367\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/hale-450x367.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/hale-768x626.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/hale.jpg 884w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-17271\" class=\"wp-caption-text\">L&#8217;astronome Alan Hale est un grand sp\u00e9cialiste des com\u00e8tes. Avec Thomas Bopp, il a d\u00e9couvert la plus brillante com\u00e8te du XXe si\u00e8cle, C\/1995 O1. \u00a9 Dave Thomas<\/figcaption><\/figure>\n<ul>\n<li><em>Les com\u00e8tes ne sont pas rares. \u00c0 tout moment, en moyenne, environ une demi-douzaine peuvent \u00eatre d\u00e9tect\u00e9es visuellement avec des t\u00e9lescopes. La plupart de ces objets sont peu spectaculaires. La com\u00e8te C\/2022 E3 (ZTF) est un peu plus int\u00e9ressante car elle pourrait devenir visible \u00e0 l&#8217;\u0153il nu pour certaines personnes. Des observateurs situ\u00e9s sous un bon ciel de campagne, qui savent exactement o\u00f9 chercher et quoi chercher&#8230; <\/em>En clair, des astronomes amateurs.<\/li>\n<\/ul>\n<h5>Une com\u00e8te assez banale :<\/h5>\n<ul>\n<li><em>Concernant la couleur verte, elle provient de l&#8217;excitation du carbone diatomique \u00e9mis par la com\u00e8te quand elle est touch\u00e9e par le vent solaire. Presque toutes les com\u00e8tes contiennent du carbone et pr\u00e9sentent donc cette coloration en s&#8217;approchant du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/10\/26\/au-rajasthan-on-a-vu-le-soleil-se-coucher-partiellement-eclipse\/\" target=\"_blank\" rel=\"noopener\">Soleil<\/a>. Il n&#8217;y a l\u00e0 rien d&#8217;exceptionnel.<\/em><\/li>\n<\/ul>\n<figure id=\"attachment_17272\" aria-describedby=\"caption-attachment-17272\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet-1.jpg\" rel=\"lightbox[17269]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-17272\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet-1-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet-1-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet-1-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet-1-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet-1.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-17272\" class=\"wp-caption-text\">C\/2022 E3 (ZTF) pr\u00e9sente la couleur verte des com\u00e8tes proches du Soleil. \u00a9 Michael J\u00e4ger<\/figcaption><\/figure>\n<ul>\n<li><em>\u00c0 propos de cet \u00e9v\u00e9nement qui arrive \u00abune fois dans une civilisation\u00bb : les calculs les plus r\u00e9cents indiquent que la com\u00e8te ZTF est revenue pour la derni\u00e8re fois il y a environ 47.000 ans. Certes, c&#8217;\u00e9tait \u00e0 peu pr\u00e8s l&#8217;\u00e9poque des N\u00e9andertaliens. Mais encore une fois, cela n&#8217;a rien d&#8217;inhabituel : il y a de nombreuses autres com\u00e8tes qui ont des p\u00e9riodes orbitales aussi longues. Quant aux N\u00e9andertaliens, il n&#8217;ont probablement pas observ\u00e9 le pr\u00e9c\u00e9dent passage de ZTF, si elle ne s&#8217;est pas plus approch\u00e9e de la Terre.<\/em><\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" title=\"Com\u00e8te C2022 E3 ZTF: Tout savoir pour l&#039;observer (et surtout la photographier!)\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/JC_GyeQslx4?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<div class=\"mceTemp\"><\/div>\n<p><strong>En conclusion, on peut dire que C\/2022 E3 (ZTF) sera une belle com\u00e8te pour les observateurs exp\u00e9riment\u00e9s munis d&#8217;un <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/11\/peut-on-choisir-son-premier-telescope-sans-se-tromper\/\" target=\"_blank\" rel=\"noopener\">t\u00e9lescope<\/a>. Le grand public ne la verra pas directement, mais chacun pourra admirer les images r\u00e9alis\u00e9es par des astrophotographes comme <a href=\"https:\/\/twitter.com\/Komet123Jager?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor\" target=\"_blank\" rel=\"noopener\">Michael J\u00e4ger<\/a> ou <a href=\"https:\/\/cometografia.es\/\" target=\"_blank\" rel=\"noopener\">Jos\u00e9 J. Chamb\u00f3 Bris<\/a>.<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/12\/carte_comete.jpg\" rel=\"lightbox[17269]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-17167\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/12\/carte_comete-450x338.jpg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/12\/carte_comete-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/12\/carte_comete-768x576.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/12\/carte_comete.jpg 1024w\" 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\/2022\/02\/07\/lexplosion-dune-comete-aurait-decime-des-peuples-amerindiens\/\" target=\"_blank\" rel=\"noopener\">L\u2019explosion d\u2019une com\u00e8te aurait d\u00e9cim\u00e9 des peuples Am\u00e9rindiens<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/28\/dans-le-ciel-de-la-palma-la-comete-leonard-fait-son-show\/\" target=\"_blank\" rel=\"noopener\">Dans le ciel de La Palma, la com\u00e8te Leonard fait son show<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/23\/en-avril-1066-le-retour-de-la-comete-de-halley-fut-exceptionnel\/\" target=\"_blank\" rel=\"noopener\">En 1066, le passage de la com\u00e8te de Halley fut exceptionnel<\/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>Alors que les m\u00e9dias s&#8217;emballent avec l&#8217;arriv\u00e9e de la com\u00e8te C\/2022 E3 (ZTF), l&#8217;astronome Alan Hale nous rappelle ce qu&#8217;il en est exactement. Un nom accroch\u00e9 au firmament : Si vous aimez les astres chevelus, le nom d&#8217;Alan Hale (lire sa biographie en anglais) vous dit forc\u00e9ment quelque chose. Le 23 juillet 1995, cet astronome &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/21\/comete-ztf-ce-quen-pense-lastronome-alan-hale\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Com\u00e8te ZTF : ce qu&#8217;en pense l&#8217;astronome Alan Hale<\/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":17270,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3356,3337,1441,93,3250,895],"class_list":["post-17269","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-alan-hale","tag-c-2022-e3-ztf","tag-carbone-diatomique","tag-comete","tag-jose-j-chambo-bris","tag-michael-jager"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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