{"id":1423,"date":"2014-12-18T15:25:43","date_gmt":"2014-12-18T15:25:43","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1423"},"modified":"2015-01-04T15:34:02","modified_gmt":"2015-01-04T15:34:02","slug":"la-comete-c2014-q2-lovejoy-arrive","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/18\/la-comete-c2014-q2-lovejoy-arrive\/","title":{"rendered":"La com\u00e8te C\/2014 Q2 Lovejoy arrive"},"content":{"rendered":"

Le 17 ao\u00fbt 2014, l’astronome amateur Terry Lovejoy<\/a> d\u00e9couvrait une com\u00e8te (surnomm\u00e9e C\/2014 Q2 Lovejoy) depuis son observatoire situ\u00e9 non loin de Brisbane, dans l’\u00e9tat du Queensland. Terry Lovejoy, qui a r\u00e9alis\u00e9 cette d\u00e9couverte \u00e0 l’aide d’une cam\u00e9ra CCD et d’un simple t\u00e9lescope <\/a>de 20 centim\u00e8tres de diam\u00e8tre, n’en est pas \u00e0 son coup d’essai.<\/p>\n

\"com\u00e8te\"<\/a><\/p>\n

C’est la cinqui\u00e8me fois qu’il d\u00e9couvre un astre chevelu, et son nom est tout particuli\u00e8rement associ\u00e9 \u00e0 C\/2011 W3 Lovejoy<\/a>, l’une des plus belles com\u00e8tes qui illumina le ciel de l’h\u00e9misph\u00e8re sud d\u00e9but janvier 2012, apr\u00e8s avoir r\u00e9sist\u00e9 \u00e0 son survol du Soleil <\/a>entre le 15 et le 16 d\u00e9cembre 2011 (\u00e0 une distance de 140.000 kilom\u00e8tres).<\/p>\n

Pour trouver autant de com\u00e8tes, Terry Lovejoy a une technique bien rod\u00e9e : il r\u00e9alise des s\u00e9ries de 3 photographies de petites portions du ciel qui sont ensuite analys\u00e9es par un logiciel charg\u00e9 de d\u00e9tecter tous les points qui ont boug\u00e9 entre les images. La plupart sont des ast\u00e9ro\u00efdes<\/a>, parfois ce sont des com\u00e8tes <\/a>d\u00e9j\u00e0 r\u00e9pertori\u00e9es, plus rarement c’est une d\u00e9couverte.<\/p>\n

La com\u00e8te C\/2014 Q2 ne sera pas aussi spectaculaire que sa grande soeur de 2011, mais elle commence \u00e0 mobiliser la communaut\u00e9 des astronomes<\/a>, qu’ils soient amateurs ou professionnels. L’image ci-dessus, r\u00e9alis\u00e9e au t\u00e9lescope le 14 d\u00e9cembre dernier par l’astronome amateur Damian Peach<\/a>, montre un astre avec une belle couleur verte produite par le cyanog\u00e8ne (un gaz toxique qu’on retrouve \u00a0dans de nombreuses com\u00e8tes) et une queue constitu\u00e9e d’une multitude de jets de gaz et de poussi\u00e8re.<\/p>\n

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

Actuellement visible depuis l’h\u00e9misph\u00e8re sud, la com\u00e8te C\/2014 Q2 s’\u00e9l\u00e8ve progressivement dans le ciel et deviendra observable en France \u00e0 partir de la fin du mois de d\u00e9cembre et surtout en janvier 2015, pas tr\u00e8s loin de la constellation d’Orion<\/a>. Le 7 janvier elle sera \u00e0 70 millions de kilom\u00e8tres de la Terre et sa magnitude devrait permettre de la deviner \u00e0 l’oeil nu sous un ciel bien noir.<\/p>\n","protected":false},"excerpt":{"rendered":"

Le 17 ao\u00fbt 2014, l’astronome amateur Terry Lovejoy d\u00e9couvrait une com\u00e8te (surnomm\u00e9e C\/2014 Q2 Lovejoy) depuis son observatoire situ\u00e9 non loin de Brisbane, dans l’\u00e9tat du Queensland. Terry Lovejoy, qui a r\u00e9alis\u00e9 cette d\u00e9couverte \u00e0 l’aide d’une cam\u00e9ra CCD et d’un simple t\u00e9lescope de 20 centim\u00e8tres de diam\u00e8tre, n’en est pas \u00e0 son coup d’essai. … Continuer la lecture de La com\u00e8te C\/2014 Q2 Lovejoy arrive<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":1424,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[240,94,686,687,691,689,690,93,354,693,692,192,104,688,97,96,685],"class_list":["post-1423","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-asteroide","tag-astronome","tag-australie","tag-briscane","tag-c2011-w3","tag-c2014-q2","tag-camera-ccd","tag-comete","tag-constellation-dorion","tag-cyanogene","tag-damian-peach","tag-magnitude","tag-observatoire","tag-queensland","tag-soleil","tag-telescope","tag-terry-lovejoy"],"yoast_head":"\nLa com\u00e8te C2014 Q2 Lovejoy arrive<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/18\/la-comete-c2014-q2-lovejoy-arrive\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La com\u00e8te C2014 Q2 Lovejoy arrive\" \/>\n<meta property=\"og:description\" content=\"Le 17 ao\u00fbt 2014, l’astronome amateur Terry Lovejoy d\u00e9couvrait une com\u00e8te (surnomm\u00e9e C\/2014 Q2 Lovejoy) depuis son observatoire situ\u00e9 non loin de Brisbane, dans l’\u00e9tat du Queensland. Terry Lovejoy, qui a r\u00e9alis\u00e9 cette d\u00e9couverte \u00e0 l’aide d’une cam\u00e9ra CCD et d’un simple t\u00e9lescope de 20 centim\u00e8tres de diam\u00e8tre, n’en est pas \u00e0 son coup d’essai. … Continuer la lecture de La com\u00e8te C\/2014 Q2 Lovejoy arrive →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/18\/la-comete-c2014-q2-lovejoy-arrive\/\" \/>\n<meta property=\"og:site_name\" content=\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\" \/>\n<meta property=\"article:published_time\" content=\"2014-12-18T15:25:43+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-01-04T15:34:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/com\u00e8te.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"1283\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Jean-Baptiste FELDMANN\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jean-Baptiste FELDMANN\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/18\/la-comete-c2014-q2-lovejoy-arrive\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/18\/la-comete-c2014-q2-lovejoy-arrive\/\",\"name\":\"La com\u00e8te C2014 Q2 Lovejoy arrive\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/18\/la-comete-c2014-q2-lovejoy-arrive\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/18\/la-comete-c2014-q2-lovejoy-arrive\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/com\u00e8te.jpg\",\"datePublished\":\"2014-12-18T15:25:43+00:00\",\"dateModified\":\"2015-01-04T15:34:02+00:00\",\"author\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/18\/la-comete-c2014-q2-lovejoy-arrive\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/18\/la-comete-c2014-q2-lovejoy-arrive\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/com\u00e8te.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/com\u00e8te.jpg\",\"width\":1280,\"height\":1283},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/\",\"name\":\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\",\"description\":\""J'ai en moi un besoin terrible. 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