{"id":10059,"date":"2018-12-22T13:35:37","date_gmt":"2018-12-22T13:35:37","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=10059"},"modified":"2019-01-04T10:03:54","modified_gmt":"2019-01-04T10:03:54","slug":"les-telescopes-de-la-nasa-braques-sur-46p-wirtanen","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/12\/22\/les-telescopes-de-la-nasa-braques-sur-46p-wirtanen\/","title":{"rendered":"Les t\u00e9lescopes de la NASA braqu\u00e9s sur 46P\/Wirtanen"},"content":{"rendered":"

Diff\u00e9rents t\u00e9lescopes de la NASA ont \u00e9t\u00e9 mobilis\u00e9s pour suivre le passage de 46P\/Wirtanen, la com\u00e8te de l’ann\u00e9e, appel\u00e9e aussi com\u00e8te de No\u00ebl.<\/strong><\/p>\n

46P\/Wirtanen est pass\u00e9e \u00e0 un peu plus de 11 millions de kilom\u00e8tres de nous le 16 d\u00e9cembre. Bien que ce soit l’astre chevelu le plus brillant de l’ann\u00e9e qui se termine, elle \u00e9tait \u00e0 peine visible \u00e0 l’\u0153il nu (magnitude<\/a> 4 environ), m\u00eame dans un ciel tr\u00e8s sombre (il \u00e9tait pr\u00e9f\u00e9rable de l\u2019observer \u00e0 l\u2019aide de jumelles<\/a> ou d\u2019une longue-vue<\/a>). La NASA a braqu\u00e9 plusieurs instruments dans sa direction (article en anglais<\/a>) pour en apprendre un peu plus sur cette com\u00e8te d\u00e9couverte\u00a0le 17 janvier 1948 par l\u2019astronome am\u00e9ricain Carl Alvar Wirtanen et qui revient nous voir tous les 5,5 ans.<\/p>\n

\"\"<\/a>
La com\u00e8te 46P\/Wirtanen photographi\u00e9e par le t\u00e9lescope spatial Hubble. \u00a9 NASA<\/figcaption><\/figure>\n

C’est d’abord le v\u00e9n\u00e9rable t\u00e9lescope spatial Hubble<\/a> (28 ans de bons et loyaux services) qui a photographi\u00e9 la coma de la com\u00e8te. Il s’agit du nuage de gaz et de poussi\u00e8re qui constitue sa chevelure et masque son noyau.<\/p>\n

L’image ci-dessus a \u00e9t\u00e9 prise le 13 d\u00e9cembre \u00e0 l’aide de la Wide Field Camera<\/em>\u00a03 (WFC3<\/a>), la troisi\u00e8me cam\u00e9ra \u00e0 grand champ qui fut install\u00e9e sur Hubble en 2009 au cours de la mission\u00a0STS-125<\/a>, ultime mission d\u2019une navette am\u00e9ricaine (il s\u2019agissait d\u2019Atlantis) vers le t\u00e9lescope spatial. Les astronomes qui souhaitaient \u00e9tudier l’alt\u00e9ration des gaz com\u00e9taires par les radiations solaires ont ensuite combin\u00e9 les images de Hubble avec les donn\u00e9es transmises par deux autres observatoires spatiaux,\u00a0Chandra<\/a> et le\u00a0Neil Gehrels Swift Observatory<\/em><\/a>.<\/p>\n

\"\"<\/a>
La com\u00e8te 46P\/Wirtanen photographi\u00e9e par l’observatoire volant SOFIA. \u00a9 NASA\/SOFIA<\/figcaption><\/figure>\n

D’autres images ont \u00e9t\u00e9 acquises par l’observatoire volant SOFIA<\/a> (Stratospheric Observatory for Infrared Astronomy<\/em>) les 16 et 17 d\u00e9cembre au cours d’un vol effectu\u00e9 \u00e0 plus de 12 kilom\u00e8tres d’altitude.<\/p>\n

Lorsque la Lune<\/a> ne sera plus une g\u00eane, les astronomes amateurs pourront encore suivre la com\u00e8te 46P\/Wirtanen qui s’\u00e9loigne d\u00e9sormais de nous\u00a0(cartes et infos ici<\/a>).<\/p>\n","protected":false},"excerpt":{"rendered":"

Diff\u00e9rents t\u00e9lescopes de la NASA ont \u00e9t\u00e9 mobilis\u00e9s pour suivre le passage de 46P\/Wirtanen, la com\u00e8te de l’ann\u00e9e, appel\u00e9e aussi com\u00e8te de No\u00ebl. 46P\/Wirtanen est pass\u00e9e \u00e0 un peu plus de 11 millions de kilom\u00e8tres de nous le 16 d\u00e9cembre. Bien que ce soit l’astre chevelu le plus brillant de l’ann\u00e9e qui se termine, elle … Continuer la lecture de Les t\u00e9lescopes de la NASA braqu\u00e9s sur 46P\/Wirtanen<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":10060,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1880,486,2621,791,544],"class_list":["post-10059","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-comete-46pwirtanen","tag-nasa","tag-neil-gehrels-swift-observatory","tag-telescope-chandra","tag-telescope-spatial-hubble"],"yoast_head":"\nLes t\u00e9lescopes de la NASA braqu\u00e9s sur 46P\/Wirtanen<\/title>\n<meta name=\"description\" content=\"Diff\u00e9rents t\u00e9lescopes de la NASA ont \u00e9t\u00e9 mobilis\u00e9s pour suivre le passage de 46P\/Wirtanen, la com\u00e8te de l'ann\u00e9e, 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