{"id":13297,"date":"2021-01-13T21:16:35","date_gmt":"2021-01-13T21:16:35","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=13297"},"modified":"2021-02-04T17:26:32","modified_gmt":"2021-02-04T17:26:32","slug":"la-comete-c-2021-a1-leonard-sannonce-prometteuse","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/01\/13\/la-comete-c-2021-a1-leonard-sannonce-prometteuse\/","title":{"rendered":"La com\u00e8te Leonard va-t-elle tenir ses promesses en 2021 ?"},"content":{"rendered":"<p><strong>La premi\u00e8re com\u00e8te d\u00e9couverte cette ann\u00e9e, C\/2021 A1 (Leonard), pr\u00e9sente des caract\u00e9ristiques tr\u00e8s prometteuses selon les astronomes.\u00a0<\/strong><\/p>\n<h5>Nouvelle visiteuse :<\/h5>\n<p>Le 3 janvier, l&#8217;astronome <a href=\"https:\/\/catalina.lpl.arizona.edu\/person\/greg-leonard\" target=\"_blank\" rel=\"noopener\">Greg Leonard<\/a> a d\u00e9couvert une com\u00e8te de <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&#8217;Observatoire du Mont Lemmon en Arizona. L&#8217;astre chevelu , d\u00e9sormais enregistr\u00e9 sous le matricule C\/2021 A1 (Leonard), circule actuellement entre les orbites de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/18\/planete-mars-tempete-de-sable-dans-valles-marineris\/\" target=\"_blank\" rel=\"noopener\">Mars<\/a> et <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/23\/la-sonde-juno-immortalise-lombre-de-io-sur-jupiter\/\" target=\"_blank\" rel=\"noopener\">Jupiter<\/a>. Il a \u00e9t\u00e9 d\u00e9couvert dans la constellation des Chiens de Chasse, 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_13299\" aria-describedby=\"caption-attachment-13299\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/leonard1.jpg\" rel=\"lightbox[13297]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-13299\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/leonard1-450x293.jpg\" alt=\"\" width=\"450\" height=\"293\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/leonard1-450x293.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/leonard1-768x500.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/leonard1.jpg 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13299\" class=\"wp-caption-text\">La com\u00e8te C\/2021 A1 (Leonard) imag\u00e9e par le jeune amateur russe Filipp Romanov (23 ans) avec un t\u00e9lescope automatique, 3 jours seulement apr\u00e8s sa d\u00e9couverte officielle.<\/figcaption><\/figure>\n<p>En se plongeant dans leurs archives, les astronomes ont retrouv\u00e9 la trace de cette com\u00e8te : elle se cachait sur de nombreux clich\u00e9s r\u00e9alis\u00e9s depuis avril 2020 !<!--more--><\/p>\n<h5>Un unique passage :<\/h5>\n<p>La com\u00e8te\u00a0est 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&#8217;elle passerait \u00e0 35 millions de kilom\u00e8tres de la Terre le 12 d\u00e9cembre. Six jours plus tard l&#8217;astre chevelu se trouvera \u00e0 seulement 4,2 millions de kilom\u00e8tres de <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>.<\/p>\n<figure id=\"attachment_13298\" aria-describedby=\"caption-attachment-13298\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/comet2.jpg\" rel=\"lightbox[13297]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-13298\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/comet2-450x271.jpg\" alt=\"\" width=\"450\" height=\"271\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/comet2-450x271.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/comet2-1024x616.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/comet2-768x462.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/comet2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13298\" class=\"wp-caption-text\">En juillet 2020 la com\u00e8te Neowise nous avait offert un beau spectacle. C\/2021 A1 (Leonard) en fera t&#8217;elle de m\u00eame dans les prochains mois? \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>L&#8217;orbite hyperbolique de C\/2021 A1 (Leonard) sugg\u00e8re qu&#8217;elle s&#8217;est \u00e9chapp\u00e9e du <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-nuage-oort-72\/\" target=\"_blank\" rel=\"noopener\">Nuage d&#8217;Oort<\/a> et qu&#8217;elle ne fera qu&#8217;un seul passage dans le Syst\u00e8me solaire. Mais cette travers\u00e9e pourrait \u00eatre l&#8217;occasion de belles observations, tout comme ce fut le cas en juillet 2020 avec la c\u00e9l\u00e8bre <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>.<\/p>\n<figure id=\"attachment_13301\" aria-describedby=\"caption-attachment-13301\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/leonard2.jpg\" rel=\"lightbox[13297]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-13301\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/leonard2-450x303.jpg\" alt=\"\" width=\"450\" height=\"303\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/leonard2-450x303.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/leonard2.jpg 624w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13301\" class=\"wp-caption-text\">Carte g\u00e9n\u00e9rale montrant le d\u00e9placement dans le ciel nocturne de la com\u00e8te C\/2021 A1 (Leonard) durant l&#8217;ann\u00e9e 2021. \u00a9 StellaNavigator\/AstroArts<\/figcaption><\/figure>\n<p>M\u00eame si elle est encore tr\u00e8s faible, la com\u00e8te Leonard (voir ses caract\u00e9ristiques sur <a href=\"http:\/\/astro.vanbuitenen.nl\/comet\/2021A1\" target=\"_blank\" rel=\"noopener\">AstroVanbuitenen<\/a>), pr\u00e9sente une petite queue de poussi\u00e8re qui ne demande qu&#8217;\u00e0 se d\u00e9ployer \u00e0 l&#8217;approche du Soleil. Nous avons devant nous toute une ann\u00e9e pour suivre cette belle voyageuse qui devrait devenir visible \u00e0 l&#8217;\u0153il nu au mois de d\u00e9cembre. Nous aurons l&#8217;occasion d&#8217;en reparler !<\/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&#8217;une 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&#8217;Orion<\/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 premi\u00e8re com\u00e8te d\u00e9couverte cette ann\u00e9e, C\/2021 A1 (Leonard), pr\u00e9sente des caract\u00e9ristiques tr\u00e8s prometteuses selon les astronomes.\u00a0 Nouvelle visiteuse : Le 3 janvier, l&#8217;astronome Greg Leonard a d\u00e9couvert une com\u00e8te de magnitude 19 sur des images r\u00e9alis\u00e9es \u00e0 l&#8217;Observatoire du Mont Lemmon en Arizona. L&#8217;astre chevelu , d\u00e9sormais enregistr\u00e9 sous le matricule C\/2021 A1 (Leonard), &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/01\/13\/la-comete-c-2021-a1-leonard-sannonce-prometteuse\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La com\u00e8te Leonard va-t-elle tenir ses promesses en 2021 ?<\/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":13298,"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-13297","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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