{"id":10227,"date":"2019-02-04T17:40:05","date_gmt":"2019-02-04T17:40:05","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=10227"},"modified":"2019-02-13T07:47:57","modified_gmt":"2019-02-13T07:47:57","slug":"chasse-croise-matinal-entre-venus-et-jupiter","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/02\/04\/chasse-croise-matinal-entre-venus-et-jupiter\/","title":{"rendered":"Chass\u00e9-crois\u00e9 matinal entre V\u00e9nus et Jupiter"},"content":{"rendered":"

V\u00e9nus et Jupiter ont \u00e9chang\u00e9 leurs positions dans le ciel de l’aube en quelques semaines. Explications concernant ce chass\u00e9-crois\u00e9 plan\u00e9taire.\u00a0<\/strong><\/p>\n

Si vous observez r\u00e9guli\u00e8rement l’aspect du ciel avant l’aube, vous avez peut-\u00eatre remarqu\u00e9 que les plan\u00e8tes V\u00e9nus<\/a> et Jupiter<\/a> ont \u00e9chang\u00e9 leur position en un peu moins d’un mois. Comme vous le constatez sur ce montage photographique, V\u00e9nus, qui occupait la position la plus \u00e9lev\u00e9e \u00e0 la mi-janvier est d\u00e9sormais en dessous de Jupiter.<\/p>\n

\"\"<\/a>
D\u00e9placement de V\u00e9nus et Jupiter en moins d’un mois. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

Les astronomes pr\u00e9f\u00e8rent dire que l’on observait d’EST en OUEST le long de l’\u00e9cliptique le couple Jupiter-V\u00e9nus il y a 3 semaines et que cet ordre est d\u00e9sormais invers\u00e9. Pourquoi ce chass\u00e9-crois\u00e9 plan\u00e9taire ?<\/p>\n

Pour comprendre ce ph\u00e9nom\u00e8ne il faut se souvenir que V\u00e9nus (comme Mercure<\/a>) est une plan\u00e8te int\u00e9rieure : son orbite se situe entre celle de la Terre et le Soleil<\/a>. Depuis notre plan\u00e8te nous observons ces astres tant\u00f4t \u00e0 l’aube au-dessus de l’horizon EST, tant\u00f4t au cr\u00e9puscule au-dessus de l’horizon OUEST. Ils ne s’\u00e9loignent jamais beaucoup de notre \u00e9toile et nous avons l’impression qu’ils suivent le mouvement d’un balancier g\u00e9ant, s’\u00e9levant quelques semaines le matin avant de redescendre, dispara\u00eetre et revenir s’\u00e9lever en soir\u00e9e. Il est donc impossible d’observer ces deux plan\u00e8tes traverser le ciel d’EST en OUEST au cours de la nuit comme c’est le cas pour toutes les autres plan\u00e8tes dites ext\u00e9rieures (Mars<\/a>, Jupiter, Saturne<\/a>…).<\/p>\n

V\u00e9nus, apr\u00e8s son \u00e9longation maximale \u00e0 l’OUEST du Soleil le 6 janvier est d\u00e9sormais \u00e0 nos yeux en train de faire lentement marche arri\u00e8re le long de l’\u00e9cliptique (elle retombe vers l’horizon) jusqu’\u00e0 sa conjonction sup\u00e9rieure pr\u00e9vue pour le mois d’ao\u00fbt (p\u00e9riode pendant laquelle V\u00e9nus vue de la Terre passera derri\u00e8re notre \u00e9toile). Quant \u00e0 Jupiter elle se d\u00e9place en sens inverse : depuis sa conjonction solaire du 26 novembre nous la voyons remonter le long de l’\u00e9cliptique \u00e0 l’aube pour s’imposer de plus en plus longtemps la nuit jusqu’\u00e0 son opposition au mois de juin. Vus de la Terre les deux astres se sont crois\u00e9s le 22 janvier et depuis cette date Jupiter a “d\u00e9pass\u00e9” V\u00e9nus.<\/p>\n

Toutes les plan\u00e8tes tournant autour du Soleil, les d\u00e9placements plan\u00e9taires \u00e9voqu\u00e9s dans cet article sont bien entendus apparents et traduisent uniquement l’impression ressentie par les observateurs terrestres.<\/p>\n","protected":false},"excerpt":{"rendered":"

V\u00e9nus et Jupiter ont \u00e9chang\u00e9 leurs positions dans le ciel de l’aube en quelques semaines. Explications concernant ce chass\u00e9-crois\u00e9 plan\u00e9taire.\u00a0 Si vous observez r\u00e9guli\u00e8rement l’aspect du ciel avant l’aube, vous avez peut-\u00eatre remarqu\u00e9 que les plan\u00e8tes V\u00e9nus et Jupiter ont \u00e9chang\u00e9 leur position en un peu moins d’un mois. Comme vous le constatez sur ce … Continuer la lecture de Chass\u00e9-crois\u00e9 matinal entre V\u00e9nus et Jupiter<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":10228,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[90,159],"class_list":["post-10227","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-jupiter","tag-venus"],"yoast_head":"\nChass\u00e9-crois\u00e9 matinal entre V\u00e9nus et Jupiter<\/title>\n<meta name=\"description\" content=\"V\u00e9nus et Jupiter ont \u00e9chang\u00e9 leurs positions dans le ciel de l'aube en quelques semaines. 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