{"id":9947,"date":"2018-11-28T12:53:50","date_gmt":"2018-11-28T12:53:50","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9947"},"modified":"2018-12-15T16:40:26","modified_gmt":"2018-12-15T16:40:26","slug":"comment-observer-46p-wirtanen-la-comete-de-lannee","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/11\/28\/comment-observer-46p-wirtanen-la-comete-de-lannee\/","title":{"rendered":"Comment observer 46P\/Wirtanen, la com\u00e8te de l’ann\u00e9e"},"content":{"rendered":"

La com\u00e8te 46P\/Wirtanen va nous offrir un beau spectacle au cours de sa travers\u00e9e du ciel bor\u00e9al en d\u00e9cembre. Voici nos conseils pour l’admirer.<\/strong><\/p>\n

Chaque ann\u00e9e les astronomes amateurs<\/a> bien \u00e9quip\u00e9s peuvent admirer le passage d’une douzaine de com\u00e8tes. Plus rarement, l’un de ces astres chevelus s’approche suffisamment pr\u00e8s de la Terre et devient visible \u00e0 l’\u0153il nu. Ce sera le cas au cours de ce dernier mois de 2018 avec la com\u00e8te 46P\/Wirtanen qui\u00a0passera \u00e0 un peu plus de 11 millions de kilom\u00e8tres de la Terre le 16 d\u00e9cembre.<\/p>\n

\"\"<\/a>
La com\u00e8te 46P\/Wirtanen le 26 novembre. \u00a9 Tom Masterson\/Grand Mesa Observatory<\/figcaption><\/figure>\n

Prise le 26 novembre depuis le Grand Mesa Observatory<\/em><\/a> dans le Colorado, cette magnifique image nous montre la chevelure de la com\u00e8te nettement verte (en raison de la forte \u00e9mission de carbone diatomique) accompagn\u00e9e d’une fine queue.<\/p>\n

C’est le 17 janvier 1948 que Carl Alvar Wirtanen, un astronome de 37 ans travaillant \u00e0 l’Observatoire Lick en Californie, d\u00e9tecta la faible marque laiss\u00e9e par une com\u00e8te de 17\u00e8me magnitude<\/a> sur une plaque photographique prise deux nuits plus t\u00f4t. On d\u00e9termina initialement une p\u00e9riode orbitale d\u2019environ 6,7 ans pour cet astre chevelu, mais suite au passage \u00e0 proximit\u00e9 de Jupiter<\/a> en avril 1972 puis en f\u00e9vrier 1984 la p\u00e9riodicit\u00e9 fut modifi\u00e9e par le puissant champ gravitationnel de la plan\u00e8te gazeuse g\u00e9ante et ramen\u00e9e \u00e0 5,5 ans.<\/p>\n

\"\"<\/a>
Trajectoire de 46P\/Wirtanen au cours de la premi\u00e8re quinzaine du mois de d\u00e9cembre.<\/figcaption><\/figure>\n

Les cartes de la revue Sky and Telescope<\/em><\/a> vous permettent de suivre la trajectoire qu’empruntera la com\u00e8te au milieu des constellations durant le mois de d\u00e9cembre. Si tout se passe bien la magnitude de la com\u00e8te devrait \u00eatre comprise entre 3 et 4, ce qui la rend en principe visible \u00e0 l’\u0153il nu en l’observant depuis un site exempt de toute pollution lumineuse<\/a> et par une nuit sans Lune. En pratique, comme il s’agit d’un astre diffus, une paire de jumelles ou une longue-vue<\/a> vous permettront de mieux la d\u00e9tailler.<\/p>\n

\"\"<\/a>
Trajectoire de 46P\/Wirtanen au cours de la seconde quinzaine du mois de d\u00e9cembre.<\/figcaption><\/figure>\n

La com\u00e8te passera au m\u00e9ridien (le moment o\u00f9 elle est la plus haute dans le ciel) en seconde partie de nuit ; c’est \u00e0 ce moment qu’il faudra aller l’admirer (utilisez la carte de Stelvision\u00a0<\/a>pour vous orienter).\u00a0\u00c0 partir du 15 d\u00e9cembre la fen\u00eatre d’observation commencera \u00e0 se r\u00e9duire en raison de la pr\u00e9sence de la Lune qui se couchera de plus en plus tard (coucher de la Lune \u00e0 22h le 12\/12, 00h le 14\/12, 02h le 17\/12, 05h le 19\/12).\u00a0\u00a0Je vous recommande de lire les\u00a05 conseils pour observer sans avoir froid\u00a0<\/a>si vous ne voulez pas que vos sorties nocturnes virent au cauchemar !<\/p>\n","protected":false},"excerpt":{"rendered":"

La com\u00e8te 46P\/Wirtanen va nous offrir un beau spectacle au cours de sa travers\u00e9e du ciel bor\u00e9al en d\u00e9cembre. Voici nos conseils pour l’admirer. Chaque ann\u00e9e les astronomes amateurs bien \u00e9quip\u00e9s peuvent admirer le passage d’une douzaine de com\u00e8tes. Plus rarement, l’un de ces astres chevelus s’approche suffisamment pr\u00e8s de la Terre et devient visible … Continuer la lecture de Comment observer 46P\/Wirtanen, la com\u00e8te de l’ann\u00e9e<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9948,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1880],"class_list":["post-9947","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-comete-46pwirtanen"],"yoast_head":"\nComment observer 46P\/Wirtanen, la com\u00e8te de l'ann\u00e9e<\/title>\n<meta name=\"description\" content=\"La com\u00e8te 46P\/Wirtanen va nous offrir un beau spectacle au cours de sa travers\u00e9e du ciel bor\u00e9al en d\u00e9cembre. 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