{"id":11054,"date":"2019-08-18T11:38:20","date_gmt":"2019-08-18T11:38:20","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11054"},"modified":"2020-07-27T08:16:27","modified_gmt":"2020-07-27T08:16:27","slug":"perseides-2019-des-etoiles-filantes-sous-la-lune","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/08\/18\/perseides-2019-des-etoiles-filantes-sous-la-lune\/","title":{"rendered":"Pers\u00e9ides 2019\u00a0: des \u00e9toiles filantes sous la Lune"},"content":{"rendered":"
Le cru 2019 de l\u2019essaim des Pers\u00e9ides ne restera pas dans les m\u00e9moires. En cause une grosse Lune gibbeuse pr\u00e9sente \u00e0 l\u2019\u00e9poque du maximum d\u2019activit\u00e9.<\/strong><\/h5>\n
Un spectacle incontournable\u00a0:<\/h5>\n

C\u2019est une tradition d\u00e9sormais bien \u00e9tablie\u00a0: chaque mois d\u2019ao\u00fbt, apr\u00e8s les Nuits des \u00c9toiles<\/a>, les astronomes amateurs ont rendez-vous avec les Pers\u00e9ides. Ces \u00e9toiles filantes sont les restes poussi\u00e9reux abandonn\u00e9s le long de son orbite par la com\u00e8te Swift-Tuttle. Ils viennent se consumer dans l\u2019atmosph\u00e8re terrestre entre le 17 juillet et le 24 ao\u00fbt avec un maximum autour du 12 ao\u00fbt. On leur donne le nom de Pers\u00e9ides car le radiant est localis\u00e9 dans la constellation de Pers\u00e9e<\/a>.<\/p>\n

\"\"<\/a>
Brillante Pers\u00e9ide le 13 ao\u00fbt sous les Hyades et les Pl\u00e9iades. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

Une m\u00e9t\u00e9o en g\u00e9n\u00e9ral cl\u00e9mente et une p\u00e9riode de grandes vacances expliquent l\u2019int\u00e9r\u00eat port\u00e9 \u00e0 cet essaim qui n\u2019est pourtant pas le plus actif. Lorsque le ciel est d\u00e9gag\u00e9 et la Lune absente, le spectacle est au rendez-vous comme sur l’\u00eele de La Palma en 2016<\/a>.<\/p>\n

Quand la Lune g\u00e2che la f\u00eate\u00a0:<\/h5>\n

Cette ann\u00e9e la Pleine Lune<\/a> se produisant le 15 ao\u00fbt, le maximum des Pers\u00e9ides s\u2019annon\u00e7ait compliqu\u00e9 \u00e0 observer. Il fallait attendre les derni\u00e8res heures de la nuit, une fois S\u00e9l\u00e9n\u00e9 couch\u00e9e, pour esp\u00e9rer voir le ciel z\u00e9br\u00e9 par d\u2019\u00e9ph\u00e9m\u00e8res rayures lumineuses (voir par exemple la tr\u00e8s belle image r\u00e9alis\u00e9e par Jeff Dai<\/a>). Le 13 ao\u00fbt entre 4 et 5 heures, j\u2019ai d\u00e9nombr\u00e9 25 m\u00e9t\u00e9ores dont celui visible sur l\u2019image ci-dessus. Il s\u2019agit d\u2019un clich\u00e9 extrait d\u2019une s\u00e9rie de poses de 45 secondes \u00e0 4000 iso avec un objectif Samyang ouvert \u00e0 2.8 et un bo\u00eetier Nikon D7100.<\/p>\n

Une surprise avant l’aube :<\/h5>\n

Le 15 ao\u00fbt entre 4h15 et 5h15 j\u2019ai d\u00e9nombr\u00e9 deux fois moins de m\u00e9t\u00e9ores (le maximum \u00e9tait pass\u00e9). J\u2019ai eu cependant la chance d\u2019assister indirectement \u00e0 l\u2019explosion silencieuse d\u2019un m\u00e9t\u00e9ore tr\u00e8s brillant. Alors que j\u2019allais ranger mon mat\u00e9riel peu apr\u00e8s 5 heures (la lueur de l\u2019aube \u00e9claircissant lentement le ciel), un flash a illumin\u00e9 le paysage une fraction de seconde. Le temps de relever la t\u00eate, j\u2019ai vu s\u2019effacer lentement la trace de ce bolide.<\/p>\n

Des bolides au rendez-vous :<\/h5>\n

En raison de la pr\u00e9sence de la Lune seuls les m\u00e9t\u00e9ores les plus brillants, les bolides (dont la magnitude<\/a> est sup\u00e9rieure \u00e0 celle de V\u00e9nus<\/a>) ont \u00e9t\u00e9 enregistr\u00e9s par les cam\u00e9ras des r\u00e9seaux de surveillance du ciel (comme FRIPON<\/a>). Dans la nuit du 12 au 13 ao\u00fbt, 36 bolides ont ainsi \u00e9t\u00e9 photographi\u00e9s depuis la France et 139 aux USA. De son c\u00f4t\u00e9 l\u2019IMO<\/a> a annonc\u00e9 des pics d\u2019activit\u00e9 jusqu\u2019\u00e0 90 m\u00e9t\u00e9ores par heure obtenus par des groupes d\u2019observateurs effectuant des comptages visuels (4 observateurs regardant chacun en direction d\u2019un point cardinal arrivent \u00e0 surveiller toute la vo\u00fbte c\u00e9leste).<\/p>\n

En 2020 le Dernier Quartier de Lune<\/a> se produisant le 11 ao\u00fbt, il faudra privil\u00e9gier les observations pendant la premi\u00e8re partie de nuit.<\/p>\n","protected":false},"excerpt":{"rendered":"

Le cru 2019 de l\u2019essaim des Pers\u00e9ides ne restera pas dans les m\u00e9moires. En cause une grosse Lune gibbeuse pr\u00e9sente \u00e0 l\u2019\u00e9poque du maximum d\u2019activit\u00e9. Un spectacle incontournable\u00a0: C\u2019est une tradition d\u00e9sormais bien \u00e9tablie\u00a0: chaque mois d\u2019ao\u00fbt, apr\u00e8s les Nuits des \u00c9toiles, les astronomes amateurs ont rendez-vous avec les Pers\u00e9ides. Ces \u00e9toiles filantes sont les … Continuer la lecture de Pers\u00e9ides 2019\u00a0: des \u00e9toiles filantes sous la Lune<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":11065,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[554,171,296,1679,172],"class_list":["post-11054","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-bolide","tag-constellation-de-persee","tag-etoile-filante","tag-fripon","tag-perseides"],"yoast_head":"\nPers\u00e9ides 2019\u00a0: des \u00e9toiles filantes sous la Lune<\/title>\n<meta name=\"description\" content=\"Le cru 2019 de l\u2019essaim des Pers\u00e9ides ne restera pas dans les m\u00e9moires. 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