{"id":15214,"date":"2021-12-13T17:26:29","date_gmt":"2021-12-13T17:26:29","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15214"},"modified":"2021-12-23T15:56:07","modified_gmt":"2021-12-23T15:56:07","slug":"observez-la-comete-leonard-en-soiree-du-cote-de-venus","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/13\/observez-la-comete-leonard-en-soiree-du-cote-de-venus\/","title":{"rendered":"Observez la com\u00e8te Leonard en soir\u00e9e du c\u00f4t\u00e9 de V\u00e9nus"},"content":{"rendered":"<p><strong>D\u00e9sormais visible aux jumelles en soir\u00e9e, la com\u00e8te C\/2021 A1 (Leonard) sera proche de V\u00e9nus dans la soir\u00e9e du 18 d\u00e9cembre.<\/strong><\/p>\n<h5>No\u00ebl avant l&#8217;heure :<\/h5>\n<p>Cette semaine, le ciel nous offre un beau cadeau si la m\u00e9t\u00e9o le veut bien. Il s&#8217;agit de la conjonction de deux spectacles c\u00e9lestes. D&#8217;un c\u00f4t\u00e9, un bel <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/26\/suivez-le-spectaculaire-alignement-planetaire-de-cette-fin-dannee\/\" target=\"_blank\" rel=\"noopener\">alignement plan\u00e9taire<\/a> observable depuis quelques semaines. De l&#8217;autre, l&#8217;arriv\u00e9e dans le ciel du soir de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/13\/la-comete-leonard-pourrait-devenir-la-plus-brillante-de-lannee\/\" target=\"_blank\" rel=\"noopener\">com\u00e8te C\/2021 A1 (Leonard)<\/a>. L&#8217;astre chevelu sera au plus pr\u00e8s de V\u00e9nus les 17 et 18 d\u00e9cembre, mais on peut le suivre toute la semaine avec une paire de jumelles :<\/p>\n<figure id=\"attachment_15268\" aria-describedby=\"caption-attachment-15268\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comet2.jpg\" rel=\"lightbox[15214]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15268\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comet2-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comet2-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comet2-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comet2-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comet2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15268\" class=\"wp-caption-text\">D\u00e9placement de la com\u00e8te Leonard en soir\u00e9e du 12 au 19 d\u00e9cembre. \u00a9 Christine Sasiad<\/figcaption><\/figure>\n<h5>Alignement d&#8217;astres :<\/h5>\n<p>Commen\u00e7ons par les plan\u00e8tes : V\u00e9nus, Saturne et Jupiter sont spectaculaires apr\u00e8s le coucher du Soleil. En particulier\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/11\/au-japon-les-astronomes-ont-vu-la-lune-passer-devant-venus\/\" target=\"_blank\" rel=\"noopener\">V\u00e9nus<\/a>, la plus \u00e0 l\u2019Ouest et la plus basse, qui \u00e9tincelle avec une\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a>\u00a0de -4,7. Beaucoup plus haute,\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/07\/26\/en-video-lincroyable-survol-de-jupiter-et-ganymede-par-juno\/\" target=\"_blank\" rel=\"noopener\">Jupiter<\/a>\u00a0n\u2019est pas mal non plus, avec une magnitude de -2,4. Entre les deux,\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/08\/27\/voici-daphnis-la-petite-lune-qui-fait-des-vagues-autour-de-saturne\/\" target=\"_blank\" rel=\"noopener\">Saturne<\/a> est un peu plus discr\u00e8te (magnitude de 0,6).<\/p>\n<figure id=\"attachment_15215\" aria-describedby=\"caption-attachment-15215\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_leonard.jpg\" rel=\"lightbox[15214]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15215\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_leonard-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_leonard-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_leonard-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_leonard-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_leonard.jpg 1501w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15215\" class=\"wp-caption-text\">Le 18 d\u00e9cembre au cr\u00e9puscule, la com\u00e8te Leonard se trouvera \u00e0 quelques degr\u00e9s de V\u00e9nus, dans l&#8217;axe d&#8217;un bel alignement plan\u00e9taire. \u00a9 SkySafari<\/figcaption><\/figure>\n<p><a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/sciences-neptune-planete-bleue-si-mysterieuse-91744\/\" target=\"_blank\" rel=\"noopener\">Neptune<\/a> et <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/soleil-mercure-monde-extremes-91696\/\" target=\"_blank\" rel=\"noopener\">Mercure<\/a> encadrent ce bel alignement. Mais sans une bonne paire de jumelles, vous ne les verrez pas. Neptune est trop peu lumineuse ; quant \u00e0 Mercure, elle est noy\u00e9e dans les lueurs du couchant. Toute la semaine en France, la com\u00e8te Leonard va glisser sur l&#8217;horizon dans le sens Ouest-Sud-Ouest. Pour les observateurs situ\u00e9s dans l&#8217;h\u00e9misph\u00e8re Sud, C\/2021 A1 sera particuli\u00e8rement bien plac\u00e9e \u00e0 partir de la fin de la semaine :<\/p>\n<figure id=\"attachment_15258\" aria-describedby=\"caption-attachment-15258\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_reunion.jpg\" rel=\"lightbox[15214]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15258\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_reunion-450x450.jpg\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_reunion-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_reunion-1024x1024.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_reunion-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_reunion-768x768.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/carte_comete_reunion.jpg 1080w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15258\" class=\"wp-caption-text\">Visibilit\u00e9 de la com\u00e8te Leonard depuis l&#8217;\u00eele de la R\u00e9union. \u00a9 AstroAlpa<\/figcaption><\/figure>\n<h5>Com\u00e8te attendue :<\/h5>\n<p>La com\u00e8te C\/2021 A1 (Leonard) 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>. Ce dernier avait d\u00e9nich\u00e9 l&#8217;astre chevelu 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. Les calculs ont montr\u00e9 depuis que cette com\u00e8te pourrait atteindre un \u00e9clat suffisant pour \u00eatre observable avec une paire de jumelles au cours de ce mois de d\u00e9cembre.<\/p>\n<figure id=\"attachment_15160\" aria-describedby=\"caption-attachment-15160\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard.jpg\" rel=\"lightbox[15214]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15160\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15160\" class=\"wp-caption-text\">La com\u00e8te C\/2021 A1 (Leonard) le 25 novembre 2021. \u00a9 Michael J\u00e4ger<\/figcaption><\/figure>\n<p>Apr\u00e8s son passage au plus pr\u00e8s de la Terre (35 millions de kilom\u00e8tres) le 12 d\u00e9cembre, C\/2021 A1 continue de s&#8217;approcher du Soleil (le p\u00e9rih\u00e9lie est pr\u00e9vu le 3 janvier 2022). Ce 18 d\u00e9cembre, la com\u00e8te se trouve entre l&#8217;horizon Ouest et l&#8217;\u00e9clatante V\u00e9nus. Puis elle filera en direction du Soleil. Si elle ne se fragmente pas en s&#8217;approchant de notre \u00e9toile, elle redeviendra observable depuis l&#8217;h\u00e9misph\u00e8re Sud apr\u00e8s le 15 janvier.<\/p>\n<h5>Pleine Lune :<\/h5>\n<p>Ce 18 d\u00e9cembre, c&#8217;est aussi la plus haute Pleine Lune de l&#8217;ann\u00e9e ! Une fois que vous en aurez termin\u00e9 avec la com\u00e8te et les plan\u00e8tes c\u00f4t\u00e9 Ouest, regardez notre satellite naturel qui s&#8217;est lev\u00e9 \u00e0 l&#8217;Est. Au fil des heures, la Lune va escalader la vo\u00fbte c\u00e9leste. Vers minuit, elle tr\u00f4nera tr\u00e8s haut au-dessus de nos t\u00eates. Un v\u00e9ritable lustre c\u00e9leste qui \u00e9clairera les paysages de fa\u00e7on spectaculaire !<\/p>\n<figure id=\"attachment_15219\" aria-describedby=\"caption-attachment-15219\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/dessin_pleine_lune.jpg\" rel=\"lightbox[15214]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15219\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/dessin_pleine_lune-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/dessin_pleine_lune-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/dessin_pleine_lune-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/dessin_pleine_lune-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/dessin_pleine_lune.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15219\" class=\"wp-caption-text\">Dessin de la Pleine Lune. \u00a9 Christine Sasiad<\/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 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>D\u00e9sormais visible aux jumelles en soir\u00e9e, la com\u00e8te C\/2021 A1 (Leonard) sera proche de V\u00e9nus dans la soir\u00e9e du 18 d\u00e9cembre. No\u00ebl avant l&#8217;heure : Cette semaine, le ciel nous offre un beau cadeau si la m\u00e9t\u00e9o le veut bien. Il s&#8217;agit de la conjonction de deux spectacles c\u00e9lestes. D&#8217;un c\u00f4t\u00e9, un bel alignement plan\u00e9taire &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/13\/observez-la-comete-leonard-en-soiree-du-cote-de-venus\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Observez la com\u00e8te Leonard en soir\u00e9e du c\u00f4t\u00e9 de V\u00e9nus<\/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":15268,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3145,2965,3146],"class_list":["post-15214","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-alignement-planetaire","tag-comete-c-2021-a1-leonard","tag-comete-de-noel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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