{"id":9998,"date":"2018-12-05T08:10:45","date_gmt":"2018-12-05T08:10:45","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9998"},"modified":"2018-12-22T13:36:35","modified_gmt":"2018-12-22T13:36:35","slug":"la-comete-46p-wirtanen-au-dessus-du-chateau-de-la-tour","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/12\/05\/la-comete-46p-wirtanen-au-dessus-du-chateau-de-la-tour\/","title":{"rendered":"La com\u00e8te 46P\/Wirtanen au-dessus du Ch\u00e2teau de la Tour"},"content":{"rendered":"

D\u00e9sormais visible \u00e0 l’\u0153il nu, la com\u00e8te 46P\/Wirtanen continue de s’approcher de la Terre. Elle passera \u00e0 11,6 millions de km le 16 d\u00e9cembre prochain.\u00a0<\/strong><\/p>\n

On la surnomme d\u00e9j\u00e0 la com\u00e8te de l’ann\u00e9e ou la com\u00e8te de No\u00ebl (Christmas Comet<\/em>). D\u00e9couverte le 17 janvier 1948 par l’astronome am\u00e9ricain Carl Alvar Wirtanen, 46P\/Wirtanen\u00a0repasse pr\u00e8s de nous tous les 5,5 ans.\u00a0Le 16 d\u00e9cembre cet astre chevelu sera \u00e0 seulement 0,0775 unit\u00e9 astronomique soit 11,6 millions de kilom\u00e8tres (un peu moins de 30 fois la distance Terre-Lune<\/a>, une broutille \u00e0 l’\u00e9chelle du Syst\u00e8me solaire), ce qui en fait probablement l’un des passages les plus favorables d\u2019une com\u00e8te connue pour les 30 ans \u00e0 venir (cartes et infos ici<\/a>).<\/p>\n

\"\"<\/a>
La com\u00e8te 46P\/Wirtanen le 5 d\u00e9cembre peu apr\u00e8s minuit. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

C’est dire si les amoureux du ciel \u00e9toil\u00e9 attendent avec impatience de voir et de photographier ce bel objet qui est d\u00e9sormais \u00e0 peine visible \u00e0 l’\u0153il nu dans les sites exempts de toute pollution lumineuse<\/a>. Cette image a \u00e9t\u00e9 r\u00e9alis\u00e9e le 5 d\u00e9cembre peu apr\u00e8s minuit au pied du Ch\u00e2teau de la Tour<\/a> en Bourgogne (5 secondes de pose avec un objectif de 50 mm ouvert \u00e0 2,8 mont\u00e9 sur un bo\u00eetier Nikon D7100, 5000 iso).<\/p>\n

L’observation des com\u00e8tes fascine toujours les Hommes et 46P\/Wirtanen ne d\u00e9roge pas \u00e0 la r\u00e8gle. La Soci\u00e9t\u00e9 Astronomique de France propose d’ailleurs aux amateurs de participer \u00e0 une campagne d’observations avec les professionnels<\/a> dans diff\u00e9rents domaines : photom\u00e9trie et imagerie haute r\u00e9solution (pour mesurer la p\u00e9riode de rotation du noyau dont le diam\u00e8tre est estim\u00e9 \u00e0 1 km), spectroscopie (pour \u00e9valuer les quantit\u00e9s de gaz lib\u00e9r\u00e9s) et mesures astrom\u00e9triques (pour am\u00e9liorer les projections concernant la trajectoire de cet astre).<\/p>\n

Pour autant 46P \/ Wirtanen ne deviendra jamais une grande com\u00e8te comme le furent\u00a0Hyakutake<\/a> en 1996 ou Hale-Bopp<\/a> en 1997. Son noyau n’est pas assez important pour produire les quantit\u00e9s de gaz et de poussi\u00e8re n\u00e9cessaires pour d\u00e9velopper une belle queue brillante. Dans le meilleur des cas nous observerons un nuage diffus (la chevelure qui entoure le noyau) de magnitude<\/a> 3 ou 4 tout juste visible \u00e0 l’\u0153il nu, mais ce sera une cible facile pour les jumelles<\/a>, longues-vues<\/a> ou petites lunettes astronomiques<\/a>. Un plaisir rare qu’il serait dommage de bouder !<\/p>\n","protected":false},"excerpt":{"rendered":"

D\u00e9sormais visible \u00e0 l’\u0153il nu, la com\u00e8te 46P\/Wirtanen continue de s’approcher de la Terre. Elle passera \u00e0 11,6 millions de km le 16 d\u00e9cembre prochain.\u00a0 On la surnomme d\u00e9j\u00e0 la com\u00e8te de l’ann\u00e9e ou la com\u00e8te de No\u00ebl (Christmas Comet). D\u00e9couverte le 17 janvier 1948 par l’astronome am\u00e9ricain Carl Alvar Wirtanen, 46P\/Wirtanen\u00a0repasse pr\u00e8s de nous … Continuer la lecture de La com\u00e8te 46P\/Wirtanen au-dessus du Ch\u00e2teau de la Tour<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9999,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[207,762,2607,2586,2461],"class_list":["post-9998","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-bourgogne","tag-chateau-de-la-tour","tag-christmas-comet","tag-comete-46p-wirtanen","tag-societe-astronomique-de-france"],"yoast_head":"\nLa com\u00e8te 46P\/Wirtanen au-dessus du Ch\u00e2teau de la Tour<\/title>\n<meta name=\"description\" content=\"D\u00e9sormais visible \u00e0 l'\u0153il nu, la com\u00e8te 46P\/Wirtanen continue de s'approcher de la Terre. 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