{"id":7586,"date":"2017-03-27T19:24:19","date_gmt":"2017-03-27T19:24:19","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7586"},"modified":"2017-04-04T15:06:35","modified_gmt":"2017-04-04T15:06:35","slug":"41ptuttle-giacobini-kresak-une-comete-dans-la-grande-ourse","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/03\/27\/41ptuttle-giacobini-kresak-une-comete-dans-la-grande-ourse\/","title":{"rendered":"41P\/Tuttle\u2013Giacobini\u2013Kresak, une com\u00e8te dans la Grande Ourse"},"content":{"rendered":"

En traversant la constellation de la Grande Ourse, la com\u00e8te\u00a041P\/Tuttle\u2013Giacobini\u2013Kresak y a fait quelques jolies rencontres, comme M 97 et M 108.\u00a0<\/strong><\/p>\n

Les astronomes amateurs qui ont tent\u00e9 le marathon Messier<\/a> le week-end dernier ont sans doute point\u00e9 deux objets tr\u00e8s photog\u00e9niques dans la Grande Ourse<\/a>, Messier 97 et Messier 108. Messier 97 (qu’on appelle aussi la n\u00e9buleuse du Hibou), l’un des objets les \u00a0plus faibles du catalogue Messier<\/a>, est une n\u00e9buleuse plan\u00e9taire (tout comme ESO 378-1<\/a>) qui a \u00e9t\u00e9 d\u00e9couverte par l’astronome fran\u00e7ais Pierre M\u00e9chain le 16 f\u00e9vrier 1781. Sa magnitude est proche de 10 et son diam\u00e8tre d’environ 3,4 minutes d’arc.<\/p>\n

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

Trois jours apr\u00e8s avoir d\u00e9couvert M 97, Pierre M\u00e9chain rep\u00e9ra \u00e0 moins d’un degr\u00e9 une galaxie spirale (comparable \u00e0 Messier 98<\/a>) de m\u00eame magnitude qui s’\u00e9tire sur 8 minutes d’arc et porte le num\u00e9ro 108 dans le catalogue Messier.<\/p>\n

Le 21 mars dernier, l’astrophotographe Gregg Ruppel<\/a> a photographi\u00e9 dans ce coin de ciel un astre chevelu qui \u00e9tait de passage. Il s’agit de la com\u00e8te\u00a041P\/Tuttle\u2013Giacobini\u2013Kresak, un petit corps glac\u00e9 de 1,5 km de diam\u00e8tre qui repasse pr\u00e8s de nous tous les 5,4 ans. Elle porte le nom de ses trois d\u00e9couvreurs et red\u00e9couvreurs successifs,\u00a0Horace Parnell Tuttle le 3 mai 1858, Michel Giacobini en 1907 et \u013dubor Kres\u00e1k en 1951.<\/p>\n

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

Entre le 20 mars et le 20 mai, la com\u00e8te, qui sera visible dans une paire de jumelles, prendra son temps pour traverser une partie du ciel bor\u00e9al, de la Grande Ourse \u00e0 la Lyre.<\/p>\n

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

La photographie de Gregg Ruppel nous permet de voir dans le m\u00eame champ des objets c\u00e9lestes \u00e0 des distances tr\u00e8s vari\u00e9es : la com\u00e8te se trouve \u00e0 moins de 200 millions de km, les \u00e9toiles \u00e0 quelques dizaines d’ann\u00e9es-lumi\u00e8re (A-L), Messier 97 \u00e0 plusieurs milliers d’A-L et Messier 108 \u00e0 45 millions d’A-L.<\/p>\n","protected":false},"excerpt":{"rendered":"

En traversant la constellation de la Grande Ourse, la com\u00e8te\u00a041P\/Tuttle\u2013Giacobini\u2013Kresak y a fait quelques jolies rencontres, comme M 97 et M 108.\u00a0 Les astronomes amateurs qui ont tent\u00e9 le marathon Messier le week-end dernier ont sans doute point\u00e9 deux objets tr\u00e8s photog\u00e9niques dans la Grande Ourse, Messier 97 et Messier 108. Messier 97 (qu’on appelle … Continuer la lecture de 41P\/Tuttle\u2013Giacobini\u2013Kresak, une com\u00e8te dans la Grande Ourse<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7588,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1522,2149,456,103,2152,2151,2150,2153],"class_list":["post-7586","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-catalogue-messier","tag-comete-41ptuttle-giacobini-kresak","tag-constellation-de-la-grande-ourse","tag-constellation-de-la-lyre","tag-gregg-ruppel","tag-messier-108","tag-messier-97","tag-nebuleuse-du-hibou"],"yoast_head":"\n41P\/Tuttle\u2013Giacobini\u2013Kresak, une com\u00e8te dans la Grande Ourse<\/title>\n<meta name=\"description\" content=\"En traversant la constellation de la Grande Ourse, la com\u00e8te 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