{"id":11610,"date":"2020-01-29T17:27:34","date_gmt":"2020-01-29T17:27:34","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11610"},"modified":"2020-02-20T20:40:08","modified_gmt":"2020-02-20T20:40:08","slug":"la-comete-c-2017-t2-et-le-double-amas-detoiles-de-persee","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/01\/29\/la-comete-c-2017-t2-et-le-double-amas-detoiles-de-persee\/","title":{"rendered":"La com\u00e8te C\/2017 T2 et le double amas d’\u00e9toiles de Pers\u00e9e"},"content":{"rendered":"

Rapprochement c\u00e9leste particuli\u00e8rement photog\u00e9nique, voici la rencontre entre la com\u00e8te C\/2017 T2 et le double amas d’\u00e9toiles de Pers\u00e9e.\u00a0<\/strong><\/p>\n

La com\u00e8te C\/2017 T2 a \u00e9t\u00e9 d\u00e9couverte le 2 octobre 2017 \u00e0 la magnitude<\/a> 19,9 par le r\u00e9seau de surveillance d\u2019ast\u00e9ro\u00efdes Pan-Starrs<\/a>\u00a0(Panoramic Survey Telescope and Rapid Response System<\/em>) install\u00e9 \u00e0 Hawaii<\/a>. Ce t\u00e9lescope a \u00e9galement d\u00e9nich\u00e9 d’autres astres chevelus comme C\/2014 Q1 <\/a>ou encore C\/2016 R2<\/a>. C\/2017 T2 ne laissera pas un souvenir imp\u00e9rissable puisque son \u00e9clat actuel la r\u00e9serve aux possesseurs de tr\u00e8s gros t\u00e9lescopes. Mais sa trajectoire la conduite \u00e0 passer dans le m\u00eame champ que le double amas de Pers\u00e9e.<\/p>\n

\"\"<\/a>
La com\u00e8te C\/2017 T2 passe \u00e0 proximit\u00e9 du double amas de Pers\u00e9e. \u00a9 Gregg Ruppel<\/figcaption><\/figure>\n

L’astrophotographe Gregg Ruppel<\/a> a immortalis\u00e9 ce rapprochement apparent le 26 janvier.<\/p>\n

Le double amas de Pers\u00e9e est un des plus beaux objets c\u00e9lestes. Il est en outre tr\u00e8s facile \u00e0 admirer juste en dessous de Cassiop\u00e9e<\/a> comme une petite tache cotonneuse au milieu des \u00e9toiles de la Voie lact\u00e9e<\/a>.\u00a0Il s\u2019agit des amas d\u2019\u00e9toiles NGC 869 et 884 qui s\u2019\u00e9tendent sur une surface apparente \u00e9quivalente \u00e0 la\u00a0Pleine Lune<\/a> (30\u2032) mais qui sont beaucoup moins lumineux (magnitude 4).<\/span><\/p>\n

\"\"<\/a>
Le double amas d’\u00e9toiles de la constellation de Pers\u00e9e. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

N\u00e9s dans le m\u00eame nuage interstellaire, ces deux amas sont tr\u00e8s jeunes : moins de 15 millions d\u2019ann\u00e9es. Ils sont magnifiques \u00e0 d\u00e9tailler dans une paire de jumelles. C\u2019est l\u2019instrument le mieux adapt\u00e9 pour les observer car si vous d\u00e9passez un grossissement de 25 fois, certaines de leurs \u00e9toiles sortiront de votre champ de vision. Le spectacle est indescriptible dans mes jumelles 16X70mm : des centaines de t\u00eates d\u2019\u00e9pingles lumineuses semblent piqu\u00e9es dans le velours sombre du ciel nocturne. Peu d\u2019objets c\u00e9lestes donnent une telle impression de relief dans cet instrument : un vrai r\u00e9gal ! Je vous invite \u00e0 admirer le dessin qu\u2019en a fait Guillaume Martinod<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Rapprochement c\u00e9leste particuli\u00e8rement photog\u00e9nique, voici la rencontre entre la com\u00e8te C\/2017 T2 et le double amas d’\u00e9toiles de Pers\u00e9e.\u00a0 La com\u00e8te C\/2017 T2 a \u00e9t\u00e9 d\u00e9couverte le 2 octobre 2017 \u00e0 la magnitude 19,9 par le r\u00e9seau de surveillance d\u2019ast\u00e9ro\u00efdes Pan-Starrs\u00a0(Panoramic Survey Telescope and Rapid Response System) install\u00e9 \u00e0 Hawaii. Ce t\u00e9lescope a \u00e9galement d\u00e9nich\u00e9 … Continuer la lecture de La com\u00e8te C\/2017 T2 et le double amas d’\u00e9toiles de Pers\u00e9e<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":11611,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2781,401,2709],"class_list":["post-11610","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-c-2017-t2-panstarrs","tag-constellation-de-cassiopee","tag-double-amas-de-persee"],"yoast_head":"\nLa com\u00e8te C\/2017 T2 et le double amas d'\u00e9toiles de Pers\u00e9e<\/title>\n<meta name=\"description\" content=\"Rapprochement c\u00e9leste particuli\u00e8rement photog\u00e9nique, voici la rencontre entre la com\u00e8te C\/2017 T2 et le double amas d'\u00e9toiles de Pers\u00e9e.\u00a0\" \/>\n<meta name=\"robots\" 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