{"id":6466,"date":"2016-10-11T17:01:29","date_gmt":"2016-10-11T17:01:29","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6466"},"modified":"2016-10-19T15:15:20","modified_gmt":"2016-10-19T15:15:20","slug":"discrete-comete-43pwolf-harrington-de-retour","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/10\/11\/discrete-comete-43pwolf-harrington-de-retour\/","title":{"rendered":"La discr\u00e8te com\u00e8te 43P\/Wolf-Harrington est de retour"},"content":{"rendered":"

Seuls de puissants t\u00e9lescopes peuvent suivre actuellement le passage de la com\u00e8te 43P\/Wolf-Harrington, un astre chevelu de faible \u00e9clat.<\/strong><\/p>\n

C’est le 22 d\u00e9cembre 1924 que l’astronome<\/a> allemand Max Wolf d\u00e9couvre photographiquement\u00a0la com\u00e8te 43P\/Wolf-Harrington depuis l’Observatoire de Heidelberg<\/a> dont il est le directeur, une d\u00e9couverte qu’il confirme le lendemain par un autre clich\u00e9, montrant ainsi le l\u00e9ger d\u00e9placement en 24 heures de l’astre chevelu devant le ciel \u00e9toil\u00e9. La com\u00e8te, qui circulait lentement dans la constellation du Taureau<\/a>, \u00e9tait alors de magnitude 16.<\/p>\n

\"comete2\"<\/a><\/p>\n

En 1936 la com\u00e8te est pass\u00e9e \u00e0 seulement 0,13 Unit\u00e9 Astronomique de la plan\u00e8te gazeuse g\u00e9ante Jupiter<\/a>, ce qui a consid\u00e9rablement modifi\u00e9 son orbite. C’est l’astronome am\u00e9ricain Robert George Harrington qui la retrouva par hasard le 4 octobre 1951 depuis l’Observatoire du Mont Palomar<\/a>.<\/p>\n

Les noms de Wolf et Harrington sont d\u00e9sormais associ\u00e9s pour d\u00e9signer cette com\u00e8te dont la p\u00e9riode orbitale est l\u00e9g\u00e8rement sup\u00e9rieure \u00e0 6 ans et qui ne brille jamais beaucoup : au cours de son meilleur passage, en 1997, elle a atteint la magnitude 12 mais en g\u00e9n\u00e9ral on l’observe autour de la magnitude 16 lors de ses passages au p\u00e9rih\u00e9lie. Les astronomes estiment que le noyau de cet astre chevelu doit avoir un diam\u00e8tre de 3,5 kilom\u00e8tres.<\/p>\n

L’image ci-dessus est l’\u0153uvre de l’astrophotographe italien Rolando Ligustri<\/a> qui a photographi\u00e9 la com\u00e8te le 5 octobre en pilotant \u00e0 distance l’un des t\u00e9lescopes automatis\u00e9s install\u00e9s au Nouveau-Mexique du r\u00e9seau iTelescope<\/a><\/em>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Seuls de puissants t\u00e9lescopes peuvent suivre actuellement le passage de la com\u00e8te 43P\/Wolf-Harrington, un astre chevelu de faible \u00e9clat. C’est le 22 d\u00e9cembre 1924 que l’astronome allemand Max Wolf d\u00e9couvre photographiquement\u00a0la com\u00e8te 43P\/Wolf-Harrington depuis l’Observatoire de Heidelberg dont il est le directeur, une d\u00e9couverte qu’il confirme le lendemain par un autre clich\u00e9, montrant ainsi le … Continuer la lecture de La discr\u00e8te com\u00e8te 43P\/Wolf-Harrington est de retour<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":6467,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[1856,1861,90,1858,744,1857,1859,1860,1862],"class_list":["post-6466","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-comete-43pwolf-harrington","tag-itelescope","tag-jupiter","tag-max-wolf","tag-mont-palomar","tag-observatoire-de-heidelberg","tag-robert-george-harrington","tag-rolando-ligustri","tag-unite"],"yoast_head":"\nLa discr\u00e8te com\u00e8te 43P\/Wolf-Harrington est de retour<\/title>\n<meta name=\"description\" content=\"Seuls de puissants t\u00e9lescopes peuvent suivre actuellement le passage de la com\u00e8te 43P\/Wolf-Harrington, un astre chevelu de faible \u00e9clat.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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