{"id":14974,"date":"2021-11-13T10:51:45","date_gmt":"2021-11-13T10:51:45","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=14974"},"modified":"2021-11-26T17:48:34","modified_gmt":"2021-11-26T17:48:34","slug":"la-comete-leonard-pourrait-devenir-la-plus-brillante-de-lannee","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/13\/la-comete-leonard-pourrait-devenir-la-plus-brillante-de-lannee\/","title":{"rendered":"La com\u00e8te Leonard pourrait devenir la plus brillante de l&#8217;ann\u00e9e"},"content":{"rendered":"<p><strong>La com\u00e8te C\/2021 A1 (Leonard) continue de s&#8217;approcher de la Terre et pourrait nous offrir un beau spectacle au mois de d\u00e9cembre.<\/strong><\/p>\n<h5>Une ann\u00e9e pour nous rejoindre :<\/h5>\n<p>Le 3 janvier 2021, l\u2019astronome <a href=\"https:\/\/catalina.lpl.arizona.edu\/person\/greg-leonard\" target=\"_blank\" rel=\"noopener\">Greg Leonard<\/a>\u00a0a d\u00e9couvert une com\u00e8te de\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 19 sur des images r\u00e9alis\u00e9es \u00e0 l\u2019<a href=\"https:\/\/skycenter.arizona.edu\/\" target=\"_blank\" rel=\"noopener\">Observatoire du Mont Lemmon<\/a> en Arizona. L\u2019astre chevelu , enregistr\u00e9 sous le matricule C\/2021 A1 (Leonard), se trouvait alors dans les Chiens de Chasse. Cette constellation circumpolaire (proche de l&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/31\/astuce-comment-reperer-la-celebre-etoile-polaire\/\" target=\"_blank\" rel=\"noopener\">\u00e9toile Polaire<\/a>, elle ne se couche jamais pour les observateurs fran\u00e7ais) est surtout connue pour h\u00e9berger la superbe galaxie <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/05\/07\/messier-51-la-superbe-galaxie-des-chiens-de-chasse\/\" target=\"_blank\" rel=\"noopener\">Messier 51<\/a>.<\/p>\n<figure id=\"attachment_12208\" aria-describedby=\"caption-attachment-12208\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2.jpg\" rel=\"lightbox[14974]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12208\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12208\" class=\"wp-caption-text\">La com\u00e8te Neowise lors de son passage en juillet 2020. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Il aura fallu un an \u00e0 C\/2021 A1 pour venir nous voir.\u00a0La com\u00e8te est en effet attendue au plus pr\u00e8s du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/08\/27\/soho-suit-une-brillante-comete-qui-plonge-vers-le-soleil\/\" target=\"_blank\" rel=\"noopener\">Soleil<\/a>, son p\u00e9rih\u00e9lie, le 3 janvier 2022. Les astronomes ont aussi calcul\u00e9 qu\u2019elle passerait \u00e0 35 millions de kilom\u00e8tres de la Terre le 12 d\u00e9cembre. Six jours plus tard l\u2019astre chevelu se trouvera \u00e0 seulement 4,2 millions de kilom\u00e8tres de\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/14\/la-lune-sapproche-de-venus-et-de-lamas-de-la-creche\/\" target=\"_blank\" rel=\"noopener\">V\u00e9nus<\/a>.<!--more--><\/p>\n<h5>Pr\u00e9dictions hasardeuses :<\/h5>\n<p>L\u2019orbite hyperbolique de C\/2021 A1 (Leonard) sugg\u00e8re qu\u2019elle s\u2019est \u00e9chapp\u00e9e du\u00a0<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-nuage-oort-72\/\" target=\"_blank\" rel=\"noopener\">Nuage d\u2019Oort<\/a> et qu\u2019elle ne fera qu\u2019un seul passage dans le Syst\u00e8me solaire. Mais cette travers\u00e9e pourrait \u00eatre l\u2019occasion de belles observations. Tout comme ce fut le cas avec la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/07\/30\/clap-de-fin-pour-la-comete-neowise-qui-seloigne\/\" target=\"_blank\" rel=\"noopener\">com\u00e8te Neowise<\/a> en juillet 2020. Cependant, les astronomes restent prudents. La pr\u00e9diction de l&#8217;\u00e9clat des astres chevelus est un art difficile.<\/p>\n<figure id=\"attachment_14975\" aria-describedby=\"caption-attachment-14975\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1.jpg\" rel=\"lightbox[14974]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14975\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1-450x187.jpg\" alt=\"\" width=\"450\" height=\"187\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1-450x187.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1-1024x425.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1-768x318.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1-1536x637.jpg 1536w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1.jpg 1727w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14975\" class=\"wp-caption-text\">D\u00e9placements de plus en plus rapides de la com\u00e8te Leonard devant les constellations en novembre et d\u00e9cembre 2021. \u00a9 Chris Marriott&#8217;s SkyMap\/Sky and Telescope<\/figcaption><\/figure>\n<p>On estime que sa <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> pourrait \u00eatre comprise entre 3 et 6 d\u00e9but d\u00e9cembre. La com\u00e8te Leonard se trouvera pr\u00e8s de l&#8217;horizon Est en fin de nuit. Une paire de jumelles sera donc peut-\u00eatre n\u00e9cessaire pour la voir. Des cartes de rep\u00e9rage et des estimations d&#8217;\u00e9clat sont disponibles sur <a href=\"http:\/\/astro.vanbuitenen.nl\/comet\/2021A1\" target=\"_blank\" rel=\"noopener\">AstroVanbuitenen<\/a> et sur <a href=\"https:\/\/earthsky.org\/astronomy-essentials\/comet-leonard-might-become-2021s-brightest-2022\/\" target=\"_blank\" rel=\"noopener\">EarthSky<\/a>. Comme C\/2021 A1 est une com\u00e8te tr\u00e8s rapide qui circule \u00e0 plus de 70 km\/sec, son d\u00e9placement sera important au fil des nuits :<\/p>\n<figure id=\"attachment_14976\" aria-describedby=\"caption-attachment-14976\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet2.jpg\" rel=\"lightbox[14974]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14976\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet2-450x172.jpg\" alt=\"\" width=\"450\" height=\"172\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet2-450x172.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet2-1024x391.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet2-768x293.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet2.jpg 1197w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14976\" class=\"wp-caption-text\">Pr\u00e8s de la Terre en d\u00e9cembre, la com\u00e8te C\/2021 A1 se d\u00e9placera rapidement. \u00a9 EarthSky<\/figcaption><\/figure>\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 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>La com\u00e8te C\/2021 A1 (Leonard) continue de s&#8217;approcher de la Terre et pourrait nous offrir un beau spectacle au mois de d\u00e9cembre. Une ann\u00e9e pour nous rejoindre : Le 3 janvier 2021, l\u2019astronome Greg Leonard\u00a0a d\u00e9couvert une com\u00e8te de\u00a0magnitude 19 sur des images r\u00e9alis\u00e9es \u00e0 l\u2019Observatoire du Mont Lemmon en Arizona. L\u2019astre chevelu , enregistr\u00e9 &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/13\/la-comete-leonard-pourrait-devenir-la-plus-brillante-de-lannee\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La com\u00e8te Leonard pourrait devenir la plus brillante de l&#8217;ann\u00e9e<\/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":12208,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2965],"class_list":["post-14974","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-comete-c-2021-a1-leonard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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