{"id":1524,"date":"2017-01-02T08:53:38","date_gmt":"2017-01-02T08:53:38","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1524"},"modified":"2017-01-07T07:52:30","modified_gmt":"2017-01-07T07:52:30","slug":"surveillez-lessaim-meteoritique-des-quadrantides","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/02\/surveillez-lessaim-meteoritique-des-quadrantides\/","title":{"rendered":"Surveillez l’essaim m\u00e9t\u00e9oritique des Quadrantides"},"content":{"rendered":"

Si le ciel est d\u00e9gag\u00e9, l’essaim m\u00e9t\u00e9oritique des Quadrantides devrait nous offrir un joli spectacle pour bien commencer cette nouvelle ann\u00e9e.<\/strong><\/p>\n

Le d\u00e9but du mois de janvier est traditionnellement propice \u00e0 l’observation des \u00e9toiles filantes<\/a>. C’est en effet durant les cinq premi\u00e8res nuits de l’ann\u00e9e que la Terre traverse l’essaim m\u00e9t\u00e9oritique des Quadrantides.<\/p>\n

\"essaim\"<\/a><\/p>\n

Les m\u00e9t\u00e9ores portent le nom de la constellation dont ils semblent jaillir, la constellation du Quadrant Mural qui n’existe plus aujourd’hui (entre les constellations d’Hercule, du Bouvier et de la Grande Ourse<\/a>).<\/p>\n

Les Quadrantides font partie des essaims annuels les plus actifs, comme les Pers\u00e9ides<\/a> ou les G\u00e9minides (photo ci-dessus), avec plus d’une centaine de m\u00e9t\u00e9ores par heure au moment du maximum d’activit\u00e9. En 2017 la pr\u00e9sence d’une\u00a0jeune Lune<\/a> n’affectera pas l’observation de cet essaim mais il faudra penser \u00e0 bien respecter les 5 conseils pour observer sans avoir froid<\/a>. Les Quadrantides sont des m\u00e9t\u00e9ores relativement rapides puisqu’ils traversent l’atmosph\u00e8re terrestre pour s’y consumer \u00e0 une vitesse moyenne de 40 km\/sec.<\/p>\n

La plupart des courants m\u00e9t\u00e9oritiques sont constitu\u00e9s de poussi\u00e8res abandonn\u00e9es sur leur orbite par des com\u00e8tes<\/a>. Dans le cas des Quadrantides, il semble qu’elles soient issues d’un ast\u00e9ro\u00efde<\/a>, 2003 EH 1, qui se serait comport\u00e9 \u00e0 la mani\u00e8re d’une com\u00e8te (en laissant \u00e9chapper de sa surface de la poussi\u00e8re et des gaz) il y a quelques centaines d’ann\u00e9es.<\/p>\n

Les scientifiques pensent aujourd’hui qu’un nombre \u00e9lev\u00e9 d’ast\u00e9ro\u00efdes (20% des objets de la ceinture principale qui croisent entre Mars<\/a> et Jupiter<\/a>) seraient en fait d’anciens noyaux com\u00e9taires.<\/p>\n

\"quadr\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Si le ciel est d\u00e9gag\u00e9, l’essaim m\u00e9t\u00e9oritique des Quadrantides devrait nous offrir un joli spectacle pour bien commencer cette nouvelle ann\u00e9e. Le d\u00e9but du mois de janvier est traditionnellement propice \u00e0 l’observation des \u00e9toiles filantes. C’est en effet durant les cinq premi\u00e8res nuits de l’ann\u00e9e que la Terre traverse l’essaim m\u00e9t\u00e9oritique des Quadrantides. Les m\u00e9t\u00e9ores … Continuer la lecture de Surveillez l’essaim m\u00e9t\u00e9oritique des Quadrantides<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":1525,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[240,93,726,456,727,728,723,296,725,90,116,267,172,109,724],"class_list":["post-1524","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-asteroide","tag-comete","tag-constellation-dhercule","tag-constellation-de-la-grande-ourse","tag-constellation-du-bouvier","tag-constellation-du-quadrant-mural","tag-essaim-meteoritique","tag-etoile-filante","tag-geminides","tag-jupiter","tag-mars","tag-meteore","tag-perseides","tag-pleine-lune","tag-quadrantides"],"yoast_head":"\nSurveillez l'essaim m\u00e9t\u00e9oritique des Quadrantides<\/title>\n<meta name=\"description\" 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