{"id":8700,"date":"2018-01-16T17:43:54","date_gmt":"2018-01-16T17:43:54","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=8700"},"modified":"2018-01-28T17:31:16","modified_gmt":"2018-01-28T17:31:16","slug":"comete-c2016-r2-panstarrs-de-plus-plus-belle","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/01\/16\/comete-c2016-r2-panstarrs-de-plus-plus-belle\/","title":{"rendered":"La com\u00e8te C\/2016 R2 Panstarrs de plus en plus belle"},"content":{"rendered":"

C’est la bonne surprise de ce d\u00e9but d’ann\u00e9e.\u00a0La com\u00e8te C\/2016 R2 Panstarrs d\u00e9ploie une \u00e9tonnante queue de gaz, pour la grande joie des astrophotographes.\u00a0<\/strong><\/p>\n

Les com\u00e8tes sont des astres impr\u00e9visibles, et ce n’est pas\u00a0C\/2016 R2 Panstarrs qui fera dire le contraire aux astronomes.\u00a0D\u00e9couverte le 7 septembre 2016 \u00e0 la\u00a0magnitude<\/a>\u00a019,1 par le r\u00e9seau de surveillance d\u2019ast\u00e9ro\u00efdes\u00a0Pan-Starrs<\/a>\u00a0(Panoramic Survey Telescope and Rapid Response System<\/em>)install\u00e9 \u00e0\u00a0Hawaii\u00a0<\/a>(un t\u00e9lescope qui a \u00e9galement d\u00e9nich\u00e9\u00a0C\/2014 Q1 Panstarrs<\/a>), la com\u00e8te C\/2016 R2 Panstarrs est une com\u00e8te p\u00e9riodique \u00e0 tr\u00e8s longue p\u00e9riode (elle effectue sa r\u00e9volution en 20.327 ans). Actuellement dans la\u00a0\u00a0constellation du Taureau<\/a> avec une magnitude de 13, son observation n’est possible qu’avec un gros t\u00e9lescope. Inutile donc de tenter de la rep\u00e9rer avec une longue-vue<\/a> !<\/p>\n

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

Ce sont les photographies qui r\u00e9v\u00e8lent toute la beaut\u00e9 de cet astre chevelu ; exemple avec cette superbe image r\u00e9alis\u00e9e le 10 janvier par l’astrophotographe autrichien\u00a0Gerald Rhemann<\/a>\u00a0\u00e0 l’aide d’un t\u00e9lescope de 305 mm de diam\u00e8tre install\u00e9 en Namibie et pr\u00e8s d’une heure de pose.<\/p>\n

Pourquoi un tel d\u00e9ploiement de volutes bleues ? La r\u00e9ponse se trouve dans la pr\u00e9sence d’un \u00e9l\u00e9ment cl\u00e9, le monoxyde de carbone (CO), un \u00e9l\u00e9ment tr\u00e8s r\u00e9pandu dans le cosmos qui se forme au c\u0153ur des \u00e9toiles et se r\u00e9pand lors des explosions stellaires. D’apr\u00e8s des mesures effectu\u00e9es par le radiot\u00e9lescope millim\u00e9trique de l’Arizona Radio Observatory<\/em> (ARO<\/a>), Le noyau de la com\u00e8te C\/2016 R2 Panstarrs recrache chaque seconde 4,7×1028\u00a0 <\/sup>mol\u00e9cules de CO dans l’espace.<\/p>\n

Le monoxyde de carbone est un gaz extr\u00eamement volatil qui peut se sublimer (passer directement d’un \u00e9tat solide \u00e0 l’\u00e9tat gazeux) \u00e0 des temp\u00e9ratures aussi basses que -248\u00b0 C (25 K). Il suffit donc d’un peu de lumi\u00e8re solaire pour transformer les d\u00e9p\u00f4ts de CO congel\u00e9 \u00e0 la surface du noyau en jets de gaz et en nuages \u200b\u200bbleut\u00e9s (la couleur du CO ionis\u00e9 \u00e0 la longueur d’onde de 427 nanom\u00e8tres).<\/p>\n

C\/2016 R2 Panstarrs va poursuivre son chemin en direction\u00a0 du\u00a0Soleil\u00a0<\/a>dont elle sera au plus pr\u00e8s le 9 mai 2018 (date de la prochaine opposition de la plan\u00e8te\u00a0Jupiter<\/a>\u00a0et veille des traditionnelles\u00a0Rencontres Astronomiques de Printemps<\/a>) \u00e0 un peu plus de 2,6 Unit\u00e9s Astronomiques. Son d\u00e9gazage devrait donc continuer de plus belle, mais comme dans le m\u00eame temps elle s’\u00e9loigne de la Terre son \u00e9clat va diminuer : seuls les astrophotographes les mieux \u00e9quip\u00e9s pourront immortaliser son activit\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"

C’est la bonne surprise de ce d\u00e9but d’ann\u00e9e.\u00a0La com\u00e8te C\/2016 R2 Panstarrs d\u00e9ploie une \u00e9tonnante queue de gaz, pour la grande joie des astrophotographes.\u00a0 Les com\u00e8tes sont des astres impr\u00e9visibles, et ce n’est pas\u00a0C\/2016 R2 Panstarrs qui fera dire le contraire aux astronomes.\u00a0D\u00e9couverte le 7 septembre 2016 \u00e0 la\u00a0magnitude\u00a019,1 par le r\u00e9seau de surveillance d\u2019ast\u00e9ro\u00efdes\u00a0Pan-Starrs\u00a0(Panoramic … Continuer la lecture de La com\u00e8te C\/2016 R2 Panstarrs de plus en plus belle<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":8701,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[2413,2381,132,758,2412],"class_list":["post-8700","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-arizona-radio-observatory","tag-comete-c2016-r2-panstarrs","tag-constellation-du-taureau","tag-gerald-rhemann","tag-monoxyde-de-carbone"],"yoast_head":"\nLa com\u00e8te C\/2016 R2 Panstarrs de plus en plus belle<\/title>\n<meta name=\"description\" content=\"C'est la bonne surprise de ce d\u00e9but d'ann\u00e9e.\u00a0La com\u00e8te C\/2016 R2 Panstarrs d\u00e9ploie une \u00e9tonnante queue de gaz, pour la grande joie des astrophotographes.\u00a0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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