{"id":1384,"date":"2021-04-30T12:25:41","date_gmt":"2021-04-30T10:25:41","guid":{"rendered":"http:\/\/astrosurf-magazine.com\/?p=1384"},"modified":"2021-06-11T11:46:47","modified_gmt":"2021-06-11T09:46:47","slug":"venus-de-jour","status":"publish","type":"post","link":"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/","title":{"rendered":"V\u00e9nus de jour"},"content":{"rendered":"\n[et_pb_section fb_built=”1″ _builder_version=”4.9.4″ _module_preset=”default”][et_pb_row _builder_version=”4.9.4″ _module_preset=”default”][et_pb_column _builder_version=”4.9.4″ _module_preset=”default” type=”4_4″][et_pb_text _builder_version=”4.9.4″ _module_preset=”default” hover_enabled=”0″ sticky_enabled=”0″]

J\u2019ai toujours aim\u00e9 observer V\u00e9nus durant la journ\u00e9e. <\/strong>Avec un ciel clair, les contrastes sont plus doux qu\u2019en soir\u00e9e ou au petit matin et ils sont plus ais\u00e9s \u00e0 deviner.<\/strong><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.9.4″ _module_preset=”default” column_structure=”1_2,1_2″][et_pb_column _builder_version=”4.9.4″ _module_preset=”default” type=”1_2″][et_pb_text _builder_version=”4.9.4″ _module_preset=”default” hover_enabled=”0″ sticky_enabled=”0″]

L\u2019utilisation d\u2019un poste fixe va aider \u00e0 pointer V\u00e9nus en plein jour, en \u00e9vitant les calculs de positions. Les filtres color\u00e9s seront utiles pour donner un maximum de contraste au niveau de l\u2019atmosph\u00e8re de la plan\u00e8te.
La pr\u00e9sence du soleil est un danger. Lorsque l\u2019on veut observer V\u00e9nus avec une phase quasi pleine ou en fin croissant, la plan\u00e8te se trouvera angulairement tr\u00e8s proche du soleil, pr\u00e8s de la conjonction sup\u00e9rieure ou inf\u00e9rieure, respectivement presque derri\u00e8re le soleil ou devant lui. Dans ces deux cas, j\u2019occulte le chercheur ainsi que le tube de mon t\u00e9lescope jusqu’\u00e0 avoir la certitude que les lueurs du soleil ne risquent pas d\u2019endommager mat\u00e9riel et r\u00e9tine.<\/p>\n

La sonde Akatsuki<\/span><\/strong>
Akatsuki devait entrer en orbite autour de V\u00e9nus le 6 d\u00e9cembre 2010 \u00e0 l’aide d’un propulseur en c\u00e9ramique innovant. Malheureusement, le d\u00e9marrage du moteur a \u00e9chou\u00e9 : un d\u00e9bit insuffisant de pressurisation dans le moteur a entra\u00een\u00e9 une augmentation de la temp\u00e9rature du propulseur jusqu\u2019\u00e0 ce qu\u2019il se fissure. L\u2019engin spatial a d\u00e9pass\u00e9 V\u00e9nus.
Presque tout le monde consid\u00e9rait que l’orbiteur japonais \u00e9tait perdu. Cependant, les ing\u00e9nieurs de la JAXA, la Japan Aerospace Exploration Agency ont refus\u00e9 d’abandonner.
L\u2019\u00e9quipe a ventil\u00e9 le propulseur, a all\u00e9g\u00e9 le v\u00e9hicule spatial et a \u00e9labor\u00e9 un plan audacieux pour tenter une seconde mise sur orbite. Et, apr\u00e8s un trajet nettement plus long que celui pr\u00e9vu, ils ont r\u00e9ussi.
Le vaisseau spatial a non seulement surv\u00e9cu \u00e0 sa catastrophe, mais depuis le 9 d\u00e9cembre 2015, il est en orbite autour de V\u00e9nus et produit, depuis son orbite tr\u00e8s elliptique, des images \u00e9poustouflantes de nuages tourbillonnants \u00e0 plusieurs niveaux de l\u2019atmosph\u00e8re de la plan\u00e8te.
Une fran\u00e7aise, Damia Bouic, s\u2019est sp\u00e9cialis\u00e9e dans le traitement des images spatiales brutes. Celles re\u00e7ues d\u2019Akatsuki, se trouvent ici :
astroliens.com\/C1A<\/a><\/span><\/p>\n

L\u2019\u00e9quipe du projet Akatsuki (PLANET-C, Venus Climate Orbiter) demande aux observateurs amateurs et professionnels d\u2019appuyer les observations d\u2019Akatsuki. Apr\u00e8s demande d\u2019inscription, les observateurs re\u00e7oivent par courrier \u00e9lectronique des informations sur les campagnes sp\u00e9cifiques et peuvent t\u00e9l\u00e9charger leurs propres observations pass\u00e9es et futures (images, spectres, etc.). Vous trouverez plus d’informations ici :
astroliens.com\/C1B<\/a><\/span><\/p>\n

Une gigantesque base de donn\u00e9es sauvegarde un grand nombre d\u2019images plan\u00e9taires, que ce soient des photos ou des croquis. Pour V\u00e9nus, vous trouverez toutes ces images class\u00e9es par date ici :
astroliens.com\/C1C<\/a><\/span><\/p>\n

Pour l\u2019ensemble des plan\u00e8tes du syst\u00e8me solaire l\u2019adresse est : astroliens.com\/C1D<\/a><\/span><\/p>\n

Comme toujours j\u2019aime saisir par l\u2019aquarelle le moment pr\u00e9sent. Lors de cette apr\u00e8s-midi du 9 octobre 2018, le passage d\u2019un banc de nuages m\u2019a donn\u00e9 envie de r\u00e9aliser une aquarelle (voir figure 2). Dans la partie nocturne de la plan\u00e8te, on distingue tout juste l\u2019”ashen light” cette fameuse hypoth\u00e9tique lumi\u00e8re cendr\u00e9e v\u00e9nusienne toujours controvers\u00e9e. L\u2019an dernier, cette lueur \u00e9tait encore plus visible.
Pour la technique assez originale appliqu\u00e9e, je vous invite \u00e0 visualiser la petite vid\u00e9o suivante sur YouTube, on m\u2019y voit passer de ma douche (!) \u00e0 la r\u00e9alisation d\u2019un effeuillage (!) en r\u00e8gle :
astroliens.com\/C1E<\/a><\/span><\/p>[\/et_pb_text][\/et_pb_column][et_pb_column _builder_version=”4.9.4″ _module_preset=”default” type=”1_2″][et_pb_image src=”https:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/Venus20181009.jpg” _builder_version=”4.9.4″ _module_preset=”default” title_text=”Venus20181009″ url=”https:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/Venus20181009.jpg” hover_enabled=”0″ sticky_enabled=”0″][\/et_pb_image][et_pb_text _builder_version=”4.9.4″ _module_preset=”7e56652b-4cb5-4e2b-88e6-1271b53869a4″ hover_enabled=”0″ sticky_enabled=”0″]

1. Mon dernier croquis de V\u00e9nus, peu avant sa conjonction inf\u00e9rieure.<\/em><\/span><\/p>[\/et_pb_text][et_pb_image src=”https:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/venus-clouds-ns2_hh.jpg” _builder_version=”4.9.4″ _module_preset=”default” title_text=”Venus Clouds Ns2 Hh” url=”https:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/venus-clouds-ns2_hh.jpg” hover_enabled=”0″ sticky_enabled=”0″][\/et_pb_image][et_pb_text _builder_version=”4.9.4″ _module_preset=”7e56652b-4cb5-4e2b-88e6-1271b53869a4″ hover_enabled=”0″ sticky_enabled=”0″ custom_margin=”-20px||50px||false|false”]

2. Aquarelle de V\u00e9nus observ\u00e9e dans l’apr\u00e8s-midi du 9 octobre 2018.<\/em><\/span><\/p>[\/et_pb_text][et_pb_text _builder_version=”4.9.4″ _module_preset=”cc0fe250-2863-451a-a16b-b37b712439bc” hover_enabled=”0″ sticky_enabled=”0″]

L’auteur<\/strong>
Michel Deconinck observe les \u00e9toiles filantes depuis plus de 40 ans. Il partage depuis toujours ses observations avec la communaut\u00e9 scientifique. Dans les ann\u00e9es 1980, Michel \u00e9tait responsable de la section m\u00e9t\u00e9ore de l\u2019IUAA, l\u2019ex Union Internationale des Astronomes Amateurs.
Les m\u00e9t\u00e9ores lui ont permis de se lancer dans le monde de l\u2019astronomie \u00e0 moindre co\u00fbt, une chaise longue, un carnet de croquis et un chronom\u00e8tre, c\u2019est amplement suffisant. Depuis beaucoup d\u2019\u00e9toiles filantes sont pass\u00e9es sous le pont de la Voie Lact\u00e9e.<\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.9.4″ _module_preset=”default”][et_pb_column _builder_version=”4.9.4″ _module_preset=”default” type=”4_4″][et_pb_image src=”https:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/Venus2017-7_hh-scaled.jpg” _builder_version=”4.9.4″ _module_preset=”default” title_text=”Venus2017 7 Hh” url=”https:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/Venus2017-7_hh-scaled.jpg” hover_enabled=”0″ sticky_enabled=”0″][\/et_pb_image][et_pb_text _builder_version=”4.9.4″ _module_preset=”7e56652b-4cb5-4e2b-88e6-1271b53869a4″ hover_enabled=”0″ sticky_enabled=”0″]

3. Ensemble de dessins de V\u00e9nus, r\u00e9alis\u00e9s au cours de l’ann\u00e9e 2017, montrant l’\u00e9volution de son apparence \u00e0 l’oculaire.<\/em><\/span><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":1383,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":""},"categories":[22],"tags":[52],"yoast_head":"\nV\u00e9nus de jour - Astrosurf-Magazine<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"V\u00e9nus de jour - Astrosurf-Magazine\" \/>\n<meta property=\"og:url\" content=\"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/\" \/>\n<meta property=\"og:site_name\" content=\"Astrosurf-Magazine\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/AstrosurfMagazine\" \/>\n<meta property=\"article:published_time\" content=\"2021-04-30T10:25:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-06-11T09:46:47+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/featured-3.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"600\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"asm\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture est.\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/astrosurf-magazine.com\/#website\",\"url\":\"https:\/\/astrosurf-magazine.com\/\",\"name\":\"Astrosurf-Magazine\",\"description\":\"Le magazine des astronomes amateurs francophones\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/astrosurf-magazine.com\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/#primaryimage\",\"inLanguage\":\"fr-FR\",\"url\":\"https:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/featured-3.jpg\",\"contentUrl\":\"https:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/featured-3.jpg\",\"width\":600,\"height\":400},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/#webpage\",\"url\":\"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/\",\"name\":\"V\\u00e9nus de jour - Astrosurf-Magazine\",\"isPartOf\":{\"@id\":\"https:\/\/astrosurf-magazine.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/#primaryimage\"},\"datePublished\":\"2021-04-30T10:25:41+00:00\",\"dateModified\":\"2021-06-11T09:46:47+00:00\",\"author\":{\"@id\":\"https:\/\/astrosurf-magazine.com\/#\/schema\/person\/e98447ec842a3a9a03ee3ed1bbf42ce2\"},\"breadcrumb\":{\"@id\":\"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/astrosurf-magazine.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"V\\u00e9nus de jour\"}]},{\"@type\":\"Person\",\"@id\":\"https:\/\/astrosurf-magazine.com\/#\/schema\/person\/e98447ec842a3a9a03ee3ed1bbf42ce2\",\"name\":\"asm\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/astrosurf-magazine.com\/#personlogo\",\"inLanguage\":\"fr-FR\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/69c6b85957702d51e498f1384a5d2ed5?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/69c6b85957702d51e498f1384a5d2ed5?s=96&d=mm&r=g\",\"caption\":\"asm\"},\"sameAs\":[\"http:\/\/astrosurf-magazine.com\"],\"url\":\"https:\/\/astrosurf-magazine.com\/index.php\/author\/asm\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"V\u00e9nus de jour - Astrosurf-Magazine","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/","og_locale":"fr_FR","og_type":"article","og_title":"V\u00e9nus de jour - Astrosurf-Magazine","og_url":"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/","og_site_name":"Astrosurf-Magazine","article_publisher":"https:\/\/www.facebook.com\/AstrosurfMagazine","article_published_time":"2021-04-30T10:25:41+00:00","article_modified_time":"2021-06-11T09:46:47+00:00","og_image":[{"width":600,"height":400,"url":"http:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/featured-3.jpg","path":"\/home\/sites\/astrosurf-magazine.com\/web\/wp-content\/uploads\/2021\/04\/featured-3.jpg","size":"full","id":1383,"alt":"","pixels":240000,"type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"\u00c9crit par":"asm","Dur\u00e9e de lecture est.":"5 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebSite","@id":"https:\/\/astrosurf-magazine.com\/#website","url":"https:\/\/astrosurf-magazine.com\/","name":"Astrosurf-Magazine","description":"Le magazine des astronomes amateurs francophones","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/astrosurf-magazine.com\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"fr-FR"},{"@type":"ImageObject","@id":"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/#primaryimage","inLanguage":"fr-FR","url":"https:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/featured-3.jpg","contentUrl":"https:\/\/astrosurf-magazine.com\/wp-content\/uploads\/2021\/04\/featured-3.jpg","width":600,"height":400},{"@type":"WebPage","@id":"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/#webpage","url":"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/","name":"V\u00e9nus de jour - Astrosurf-Magazine","isPartOf":{"@id":"https:\/\/astrosurf-magazine.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/#primaryimage"},"datePublished":"2021-04-30T10:25:41+00:00","dateModified":"2021-06-11T09:46:47+00:00","author":{"@id":"https:\/\/astrosurf-magazine.com\/#\/schema\/person\/e98447ec842a3a9a03ee3ed1bbf42ce2"},"breadcrumb":{"@id":"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/astrosurf-magazine.com\/index.php\/2021\/04\/30\/venus-de-jour\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Accueil","item":"https:\/\/astrosurf-magazine.com\/"},{"@type":"ListItem","position":2,"name":"V\u00e9nus de jour"}]},{"@type":"Person","@id":"https:\/\/astrosurf-magazine.com\/#\/schema\/person\/e98447ec842a3a9a03ee3ed1bbf42ce2","name":"asm","image":{"@type":"ImageObject","@id":"https:\/\/astrosurf-magazine.com\/#personlogo","inLanguage":"fr-FR","url":"https:\/\/secure.gravatar.com\/avatar\/69c6b85957702d51e498f1384a5d2ed5?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/69c6b85957702d51e498f1384a5d2ed5?s=96&d=mm&r=g","caption":"asm"},"sameAs":["http:\/\/astrosurf-magazine.com"],"url":"https:\/\/astrosurf-magazine.com\/index.php\/author\/asm\/"}]}},"_links":{"self":[{"href":"https:\/\/astrosurf-magazine.com\/index.php\/wp-json\/wp\/v2\/posts\/1384"}],"collection":[{"href":"https:\/\/astrosurf-magazine.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/astrosurf-magazine.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/astrosurf-magazine.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/astrosurf-magazine.com\/index.php\/wp-json\/wp\/v2\/comments?post=1384"}],"version-history":[{"count":3,"href":"https:\/\/astrosurf-magazine.com\/index.php\/wp-json\/wp\/v2\/posts\/1384\/revisions"}],"predecessor-version":[{"id":1389,"href":"https:\/\/astrosurf-magazine.com\/index.php\/wp-json\/wp\/v2\/posts\/1384\/revisions\/1389"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/astrosurf-magazine.com\/index.php\/wp-json\/wp\/v2\/media\/1383"}],"wp:attachment":[{"href":"https:\/\/astrosurf-magazine.com\/index.php\/wp-json\/wp\/v2\/media?parent=1384"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/astrosurf-magazine.com\/index.php\/wp-json\/wp\/v2\/categories?post=1384"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/astrosurf-magazine.com\/index.php\/wp-json\/wp\/v2\/tags?post=1384"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}