{"id":12222,"date":"2020-07-17T08:24:06","date_gmt":"2020-07-17T08:24:06","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=12222"},"modified":"2020-08-02T09:39:41","modified_gmt":"2020-08-02T09:39:41","slug":"ciel-de-juillet-quatre-planetes-vous-attendent-a-laube","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/07\/17\/ciel-de-juillet-quatre-planetes-vous-attendent-a-laube\/","title":{"rendered":"Ciel de juillet : quatre plan\u00e8tes vous attendent \u00e0 l&#8217;aube"},"content":{"rendered":"<p><strong>Si vous \u00eates un l\u00e8ve-t\u00f4t, vous ne serez pas d\u00e9\u00e7u en mettant le nez dehors. Les plan\u00e8tes les plus brillantes du Syst\u00e8me solaire sont \u00e0 votre port\u00e9e.\u00a0<\/strong><\/p>\n<h5>Quatre joyaux sur l&#8217;\u00e9cliptique :<\/h5>\n<p>Votre horizon nord n&#8217;est pas assez d\u00e9gag\u00e9 pour observer la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/07\/07\/admirez-neowise-la-jolie-comete-qui-tient-enfin-ses-promesses\/\" target=\"_blank\" rel=\"noopener noreferrer\">com\u00e8te Neowise<\/a> ? Un lampadaire ruine tous vos espoirs d&#8217;admirer l&#8217;astre chevelu ? Rassurez-vous, le ciel nocturne a d&#8217;autres tr\u00e9sors \u00e0 vous d\u00e9voiler. Ils sont beaucoup plus faciles \u00e0 rep\u00e9rer car moins sensibles \u00e0 la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/09\/27\/tucson-la-ville-qui-fait-baisser-la-pollution-lumineuse\/\" target=\"_blank\" rel=\"noopener noreferrer\">pollution lumineuse<\/a>. Ce sont les quatre plus brillantes plan\u00e8tes du Syst\u00e8me solaire. En fin de nuit il s&#8217;agit dans l&#8217;ordre (d&#8217;est en ouest) de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/05\/22\/une-danseuse-aux-cotes-des-planetes-venus-et-mercure\/\" target=\"_blank\" rel=\"noopener noreferrer\">V\u00e9nus<\/a>, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/11\/27\/percival-lowell-lhomme-qui-aimait-trop-la-planete-mars\/\" target=\"_blank\" rel=\"noopener noreferrer\">Mars<\/a>, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/09\/17\/saturne-la-planete-qui-fait-naitre-des-vocations\/\" target=\"_blank\" rel=\"noopener noreferrer\">Saturne<\/a> et <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/11\/08\/saisissante-image-des-deux-anticyclones-geants-de-jupiter\/\" target=\"_blank\" rel=\"noopener noreferrer\">Jupiter<\/a>.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes.jpg\" rel=\"lightbox[12222]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-12223\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes-450x253.jpg\" alt=\"\" width=\"450\" height=\"253\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes-450x253.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes-768x432.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes.jpg 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Leur rep\u00e9rage est extr\u00eamement facile pour deux raisons. D&#8217;une part elles sont brillantes et il ne reste plus qu&#8217;elles quand le ciel commence \u00e0 s&#8217;\u00e9claircir. D&#8217;autre part elles sont situ\u00e9es le long de l&#8217;\u00e9cliptique. C&#8217;est une bande imaginaire dans laquelle nous voyons circuler le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/26\/solarigraphe-revele-soleil-dun-solstice-a-lautre\/\" target=\"_blank\" rel=\"noopener noreferrer\">Soleil<\/a> toute l&#8217;ann\u00e9e (c&#8217;est le trait vert sur le sch\u00e9ma ci-dessus). Voici ce que vous allez pouvoir observer.<!--more--><\/p>\n<h5>\u00c0 l&#8217;\u0153il nu :<\/h5>\n<p>Sans instrument vous \u00eates comme nos anc\u00eatres qui n&#8217;avaient que leurs yeux pour d\u00e9crypter les messages c\u00e9lestes. Si vous observez le ciel avant l&#8217;aube \u00e0 quelques jours d&#8217;intervalle vous remarquerez que ces quatre points lumineux se d\u00e9placent par rapport aux <a href=\"https:\/\/www.futura-sciences.com\/sciences\/questions-reponses\/espace-quest-ce-quune-etoile-157\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u00e9toiles<\/a>. D&#8217;o\u00f9 leur nom de plan\u00e8tes, traduction d&#8217;un mot grec signifiant astres errants. La plus rapide des quatre est V\u00e9nus (c&#8217;est la plus proche du Soleil) la plus lente Saturne (c&#8217;est la plus \u00e9loign\u00e9e).<\/p>\n<figure id=\"attachment_12077\" aria-describedby=\"caption-attachment-12077\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/DSC_13.jpg\" rel=\"lightbox[12222]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12077\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/DSC_13-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/DSC_13-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/DSC_13-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/DSC_13-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/DSC_13.jpg 1499w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12077\" class=\"wp-caption-text\">Une danseuse accompagne V\u00e9nus et Mercure au cr\u00e9puscule. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Vous noterez aussi des diff\u00e9rences d&#8217;\u00e9clat : la plus proche est la plus lumineuse, c&#8217;est assez logique. Vous remarquerez aussi des variations de teintes, en particulier la couleur orang\u00e9e de Mars. C&#8217;est l&#8217;oxyde de fer qui donne \u00e0 cet astre cette curieuse coloration remarqu\u00e9e depuis l&#8217;Antiquit\u00e9 : les Romains croyaient que c&#8217;\u00e9tait du sang et avaient donn\u00e9 \u00e0 cet astre le nom du dieu de la guerre.<\/p>\n<figure id=\"attachment_9419\" aria-describedby=\"caption-attachment-9419\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars.jpg\" rel=\"lightbox[12222]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-9419\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/tempet-mars.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-9419\" class=\"wp-caption-text\">Changements d\u2019aspect \u00e0 la surface de Mars en raison d\u2019une temp\u00eate de sable qui s\u2019est g\u00e9n\u00e9ralis\u00e9e en un mois. Le clich\u00e9 de r\u00e9f\u00e9rence \u00e0 gauche a \u00e9t\u00e9 pris dans le pass\u00e9 par Mars Global Surveyor, celui de droite le 28 juin 2018 par D. Peach. \u00a9 NASA\/Damian Peach<\/figcaption><\/figure>\n<h5>Dans une longue-vue :<\/h5>\n<p>Comme je le dis souvent, la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/12\/10\/longue-vue-bon-choix-debuter-astronomie\/\" target=\"_blank\" rel=\"noopener noreferrer\">longue-vue<\/a> est l&#8217;instrument id\u00e9al pour faire ses premiers pas en astronomie mais on ne pense pas toujours \u00e0 la pointer vers le ciel. Avec un grossissement d&#8217;une vingtaine de fois vous d\u00e9couvrirez le croissant de V\u00e9nus, l&#8217;ocre du petit disque martien, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/01\/11\/jeux-de-lunes-entre-anneaux-de-planete-saturne\/\" target=\"_blank\" rel=\"noopener noreferrer\">l&#8217;anneau de Saturne<\/a> et les 4 principaux <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/25\/incroyable-triple-transit-de-satellites-devant-jupiter\/\" target=\"_blank\" rel=\"noopener noreferrer\">satellites de Jupiter<\/a>.<\/p>\n<figure id=\"attachment_3021\" aria-describedby=\"caption-attachment-3021\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/saturne1.jpg\" rel=\"lightbox[12222]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-3021\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/saturne1-450x309.jpg\" alt=\"\" width=\"450\" height=\"309\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/saturne1-450x309.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/saturne1-1024x704.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/saturne1.jpg 1309w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-3021\" class=\"wp-caption-text\">variation de la visibilit\u00e9 des anneaux vus de la Terre avec une image par an de 2004 (en haut \u00e0 gauche) \u00e0 2015 (en bas \u00e0 droite). \u00a9 SEN\/D. Peach<\/figcaption><\/figure>\n<h5>Avec un t\u00e9lescope :<\/h5>\n<p>M\u00eame \u00e0 fort grossissement V\u00e9nus ne montre pas ses principaux reliefs en raison de la couche de nuages qui l&#8217;enveloppe. On commence \u00e0 discerner quelques d\u00e9tails sur Mars (qui sera au plus pr\u00e8s de la Terre le 13 octobre), en particulier ses <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/03\/20\/fissures-sombres-calotte-polaire-sud-martienne\/\" target=\"_blank\" rel=\"noopener noreferrer\">calottes polaires<\/a>. Saturne dans un t\u00e9lescope offre une vision inoubliable de son syst\u00e8me d&#8217;anneaux. Quant \u00e0 Jupiter on peut y d\u00e9couvrir des bandes gazeuses color\u00e9es qui ceinturent la plan\u00e8te ainsi que la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/05\/21\/la-grande-tache-rouge-est-elle-en-train-de-se-desagreger\/\" target=\"_blank\" rel=\"noopener noreferrer\">Grande tache rouge<\/a>, un anticyclone g\u00e9ant. <a href=\"https:\/\/www.facebook.com\/philippe.mouniguet\" target=\"_blank\" rel=\"noopener noreferrer\">Philippe Mouniguet<\/a> est pass\u00e9 ma\u00eetre dans l&#8217;art de photographier ces plan\u00e8tes comme sur ce montage du 14 juillet :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes-1.jpg\" rel=\"lightbox[12222]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-12238\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes-1-450x275.jpg\" alt=\"\" width=\"450\" height=\"275\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes-1-450x275.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes-1-1024x626.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes-1-768x469.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes-1-1536x938.jpg 1536w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/planetes-1.jpg 1858w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/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>Si vous \u00eates un l\u00e8ve-t\u00f4t, vous ne serez pas d\u00e9\u00e7u en mettant le nez dehors. Les plan\u00e8tes les plus brillantes du Syst\u00e8me solaire sont \u00e0 votre port\u00e9e.\u00a0 Quatre joyaux sur l&#8217;\u00e9cliptique : Votre horizon nord n&#8217;est pas assez d\u00e9gag\u00e9 pour observer la com\u00e8te Neowise ? Un lampadaire ruine tous vos espoirs d&#8217;admirer l&#8217;astre chevelu ? &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/07\/17\/ciel-de-juillet-quatre-planetes-vous-attendent-a-laube\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Ciel de juillet : quatre plan\u00e8tes vous attendent \u00e0 l&#8217;aube<\/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":12223,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[90,116,114,136,159],"class_list":["post-12222","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-jupiter","tag-mars","tag-planete","tag-saturne","tag-venus"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ciel de juillet : quatre plan\u00e8tes vous attendent \u00e0 l&#039;aube<\/title>\n<meta name=\"description\" content=\"Si vous \u00eates un l\u00e8ve-t\u00f4t, vous ne serez pas d\u00e9\u00e7u en mettant le nez dehors. 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