{"id":20227,"date":"2024-10-01T16:39:39","date_gmt":"2024-10-01T16:39:39","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=20227"},"modified":"2024-10-11T15:26:50","modified_gmt":"2024-10-11T15:26:50","slug":"surprise-une-nouvelle-comete-sannonce-spectaculaire","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/10\/01\/surprise-une-nouvelle-comete-sannonce-spectaculaire\/","title":{"rendered":"Surprise ! Une nouvelle com\u00e8te s&#8217;annonce spectaculaire !"},"content":{"rendered":"<p><strong>Alors qu&#8217;on attend l&#8217;arriv\u00e9e de la com\u00e8te C\/2023 A3 Tsuchinshan-ATLAS, un nouvel astre chevelu tr\u00e8s prometteur vient d&#8217;\u00eatre d\u00e9couvert.\u00a0<\/strong><\/p>\n<h5>M\u00e0j du 02\/10\/24 :<\/h5>\n<p>La com\u00e8te A11bP7I s&#8217;appelle d\u00e9sormais C\/2024 S1 (ATLAS).<\/p>\n<h5>Surprise c\u00e9leste :<\/h5>\n<p>Depuis quelques semaines, on ne parle que de la com\u00e8te C\/2023 A3 Tsuchinshan-ATLAS. D\u00e9j\u00e0 belle depuis l&#8217;h\u00e9misph\u00e8re Sud, elle passera dans quelques jours entre le Soleil et la Terre. Puis ce sera au tour des observateurs de l&#8217;h\u00e9misph\u00e8re Nord de se r\u00e9galer, car elle devrait gagner en luminosit\u00e9. Je vous renvoie vers les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/30\/ephemerides-le-ciel-du-mois-doctobre-2024\/\" target=\"_blank\" rel=\"noopener\">\u00e9ph\u00e9m\u00e9rides d&#8217;octobre 2024<\/a> pour tout savoir sur l&#8217;arriv\u00e9e de cette belle voyageuse :<\/p>\n<figure id=\"attachment_20194\" aria-describedby=\"caption-attachment-20194\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/adyer.jpg\" rel=\"lightbox[20227]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-20194 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/adyer-450x299.jpg\" alt=\"\" width=\"450\" height=\"299\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/adyer-450x299.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/adyer-1024x680.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/adyer-768x510.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/adyer-1536x1019.jpg 1536w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/adyer.jpg 2048w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-20194\" class=\"wp-caption-text\">Superbe clich\u00e9 de la com\u00e8te C\/2023 A3 Tsuchinshan-ATLAS r\u00e9alis\u00e9 le 27 septembre 2024 par l&#8217;astrophotographe <a href=\"https:\/\/www.facebook.com\/photo?fbid=10229172458794919&amp;set=a.2892555351830\" target=\"_blank\" rel=\"noopener\">Alan Dyer<\/a> depuis Bryce Canyon dans le Sud de l\u2019Utah (USA).<\/figcaption><\/figure>\n<p>Et voil\u00e0 qu&#8217;une nouvelle com\u00e8te tr\u00e8s prometteuse entre en sc\u00e8ne ! D\u00e9couverte elle aussi par le r\u00e9seau de surveillance <a href=\"https:\/\/atlas.fallingstar.com\/\" target=\"_blank\" rel=\"noopener\">ATLAS<\/a>, elle porte le matricule provisoire <span style=\"text-decoration: underline\"><strong>A11bP7I<\/strong><\/span> (lire sur <a href=\"https:\/\/cobs.si\/news\/archive\/a-big-new-sungrazing-comet\/\" target=\"_blank\" rel=\"noopener\">COBS<\/a>). Et le moins qu&#8217;on puisse dire, c&#8217;est qu&#8217;elle pourrait nous offrir un superbe spectacle&#8230;<!--more--><\/p>\n<h5>Les&#8221;sungrazer&#8221;, des astres spectaculaires :<\/h5>\n<p><strong><span style=\"text-decoration: underline\">A11bP7I<\/span><\/strong> fait partie du groupe de Kreutz, du nom de l\u2019astronome allemand Heinrich Kreutz qui en confirma l\u2019existence en 1901. Ce groupe est constitu\u00e9 de petits astres chevelus (restes de la dislocation probable d\u2019une com\u00e8te g\u00e9ante au XIIe si\u00e8cle) qui s\u2019aventurent r\u00e9guli\u00e8rement \u00e0 proximit\u00e9 du Soleil. Ce groupe compte par exemple <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/12\/21\/c2011-w3-lovejoy-letonnante-comete-de-decembre-2011\/\" target=\"_blank\" rel=\"noopener\">C\/2011 W3 Lovejoy<\/a>, qui illumina le ciel en d\u00e9cembre 2011 :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/12\/eso2.jpg\" rel=\"lightbox[20227]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4404\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/12\/eso2-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/12\/eso2-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/12\/eso2-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/12\/eso2.jpg 1280w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Dans cette famille de \u201c<em>sungrazer<\/em>\u201d (parce qu&#8217;elles <a href=\"https:\/\/lesia.obspm.fr\/perso\/jacques-crovisier\/promenade\/pro_comete_sungrazers.html\" target=\"_blank\" rel=\"noopener\">rasent le Soleil<\/a>), on trouve surtout la c\u00e9l\u00e8bre <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-comete-ikeya-seki-6216\/\" target=\"_blank\" rel=\"noopener\">C\/1965 S1 (Ikeya-Seki)<\/a>. En 1965, elle atteignit une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> de -10, devenant visible en plein jour avec une queue de 45 degr\u00e9s ! Pour <strong><span style=\"text-decoration: underline\">A11bP7I<\/span><\/strong> (infos et cartes <a href=\"http:\/\/astro.vanbuitenen.nl\/comet\/A11bP7I\" target=\"_blank\" rel=\"noopener\">ici<\/a>), les astronomes envisagent une magnitude autour de -6 au moment du p\u00e9rih\u00e9lie (le 28 octobre 2024), soit un \u00e9clat sup\u00e9rieur \u00e0 <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/07\/10\/pointez-leclatante-venus-et-admirez-son-croissant\/\" target=\"_blank\" rel=\"noopener\">V\u00e9nus<\/a>. Un spectacle comparable \u00e0 celui offert par la com\u00e8te <a href=\"https:\/\/www.eso.org\/public\/switzerland-fr\/images\/mc_naught42\/?lang\" target=\"_blank\" rel=\"noopener\">McNaught<\/a> en janvier 2007.<\/p>\n<h5>Deux grandes com\u00e8tes, comme en 1996 :<\/h5>\n<p>L&#8217;arriv\u00e9e surprise de\u00a0 <span style=\"text-decoration: underline\"><strong>A11bP7I<\/strong><\/span>, alors que tout le monde guette C\/2023 A3 Tsuchinshan-ATLAS, nous renvoie en 1996. Cette ann\u00e9e-l\u00e0, tandis que les astronomes surveillaient l\u2019arriv\u00e9e de la com\u00e8te <a title=\"Souvenir de Hale-Bopp\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/07\/souvenir-hale-bopp\/\" target=\"_blank\" rel=\"noopener\">Hale-Bopp<\/a>, la com\u00e8te <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/25\/printemps-1996-la-comete-hyakutake-fait-le-spectacle\/\" target=\"_blank\" rel=\"noopener\">Hyakutake<\/a> passa \u00e0 15 millions de kilom\u00e8tres de la Terre, seulement deux mois apr\u00e8s sa d\u00e9couverte :<\/p>\n<figure id=\"attachment_316\" aria-describedby=\"caption-attachment-316\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/05\/comet.jpg\" rel=\"lightbox[20227]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-316\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/05\/comet-450x337.jpg\" alt=\"\" width=\"450\" height=\"337\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/05\/comet-450x337.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/05\/comet-1024x768.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/05\/comet.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-316\" class=\"wp-caption-text\">La com\u00e8te Hyakutake au printemps 1996, avec au premier plan un observateur au t\u00e9lescope de 1 m\u00e8tre de Puimichel. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Sa trajectoire au voisinage de notre plan\u00e8te fut l\u2019une des plus rasantes des deux cent derni\u00e8res ann\u00e9es. Avec son \u00e9clat de\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> -1 et sa queue qui se d\u00e9ployait sur 70 degr\u00e9s dans le ciel, Hyakutake \u00e9tait la plus belle com\u00e8te observable depuis longtemps. Un an plus tard, Hale-Bopp allait lui ravir la vedette&#8230;<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/06\/26\/la-comete-13p-olbers-revient-nous-rendre-visite\/\" target=\"_blank\" rel=\"noopener\">La com\u00e8te 13P\/Olbers revient nous rendre visite<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/02\/12\/la-comete-12p-pons-brooks-devoile-ses-charmes\/\" target=\"_blank\" rel=\"noopener\">12P\/Pons-Brooks nous d\u00e9voile ses charmes<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/09\/02\/la-comete-nishimura-assaillie-par-le-vent-solaire\/\" target=\"_blank\" rel=\"noopener\">La com\u00e8te Nishimura assaillie par le vent solaire<\/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 qu&#8217;on attend l&#8217;arriv\u00e9e de la com\u00e8te C\/2023 A3 Tsuchinshan-ATLAS, un nouvel astre chevelu tr\u00e8s prometteur vient d&#8217;\u00eatre d\u00e9couvert.\u00a0 M\u00e0j du 02\/10\/24 : La com\u00e8te A11bP7I s&#8217;appelle d\u00e9sormais C\/2024 S1 (ATLAS). Surprise c\u00e9leste : Depuis quelques semaines, on ne parle que de la com\u00e8te C\/2023 A3 Tsuchinshan-ATLAS. D\u00e9j\u00e0 belle depuis l&#8217;h\u00e9misph\u00e8re Sud, elle passera dans &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/10\/01\/surprise-une-nouvelle-comete-sannonce-spectaculaire\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Surprise ! Une nouvelle com\u00e8te s&#8217;annonce spectaculaire !<\/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":20228,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3642,3643,3636,3558,869],"class_list":["post-20227","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-a11bp7i","tag-c-1965-s1-ikeya-seki","tag-comete-c-2023-a3-tsuchinshan-atlas","tag-comete-sungrazer","tag-groupe-de-kreutz"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Surprise ! 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