{"id":7479,"date":"2017-03-10T16:58:00","date_gmt":"2017-03-10T16:58:00","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7479"},"modified":"2017-03-16T13:17:39","modified_gmt":"2017-03-16T13:17:39","slug":"comete-croise-planete-coronographe-de-soho","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/03\/10\/comete-croise-planete-coronographe-de-soho\/","title":{"rendered":"Une com\u00e8te croise une plan\u00e8te dans le coronographe de SOHO"},"content":{"rendered":"

Mercure et la com\u00e8te 2P\/Encke sont actuellement visibles dans le champ du coronographe LASCO C3 de l\u2019observatoire solaire SOHO.<\/strong><\/p>\n

SOHO (Solar and Heliospheric Observatory<\/a><\/em>) est un satellite d\u2019une masse de 1,8 tonne qui a \u00e9t\u00e9 plac\u00e9 au point de Lagrange L1 \u00e0 environ 1,5 million de km de notre plan\u00e8te, l\u00e0 ou l\u2019attraction de la Terre et celle du Soleil <\/a>sont en \u00e9quilibre. Ses observations solaires viennent compl\u00e9ter celles de SDO, Solar Dynamics Observatory<\/a><\/em>.\u00a0Lanc\u00e9 il y a plus de 20 ans, le 2 d\u00e9cembre 1995 exactement, SOHO fournit quotidiennement un bulletin de sant\u00e9 de notre \u00e9toile dans diff\u00e9rentes longueurs d\u2019onde \u00e0 l\u2019aide de ses 12 instruments scientifiques : analyseurs de particules, t\u00e9lescopes, coronographes, spectrographe et imageurs.<\/p>\n

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

Les coronographes LASCO C2 (champ \u00e9troit) et C3 (grand champ) sont destin\u00e9s \u00e0 \u00e9tudier la couronne solaire (LASCO signifie Large Angle and Spectrometric Coronagraph<\/em>). Un cache central leur permet de masquer le Soleil, trop lumineux, de fa\u00e7on \u00e0 pouvoir observer ce qui se passe autour : des \u00e9ruptions solaires<\/a> bien s\u00fbr, mais \u00e9galement des \u00e9toiles et parfois des plan\u00e8tes et des com\u00e8tes.<\/span><\/span><\/p>\n

C\u2019est dans le champ de LASCO C3<\/a> que l\u2019on peut suivre jusqu’au 15 mars le passage de Mercure<\/a>\u00a0d’OUEST en EST (de droite \u00e0 gauche) apr\u00e8s sa conjonction sup\u00e9rieure qui s’est produite le 7. Dans le coronographe de SOHO Mercure est un astre de magnitude -1.6 dont la luminosit\u00e9 sature le capteur de l’instrument.<\/p>\n

Un autre astre est \u00e9galement pr\u00e9sent (jusqu’au 14 mars), mais il est beaucoup moins lumineux : il s’agit de\u00a0la com\u00e8te 2P\/Encke qui se d\u00e9place d’EST en OUEST (de gauche \u00e0 droite). Comme son nom ne l\u2019indique pas cet astre chevelu\u00a0a \u00e9t\u00e9 d\u00e9couvert par l\u2019astronome fran\u00e7ais Pierre M\u00e9chain le 17 janvier 1786 depuis Paris, mais on a pr\u00e9f\u00e9r\u00e9 lui donner le nom de J. F. Encke, l\u2019astronome allemand qui confirma sa p\u00e9riodicit\u00e9. 2P\/Encke, qui repasse tous les 3,3 ans et alimente le courant m\u00e9t\u00e9oritique des Taurides<\/a>\u00a0(actif du 25 septembre au 25 novembre), est la seconde com\u00e8te p\u00e9riodique d\u00e9couverte apr\u00e8s 1P\/Halley<\/a>.<\/p>\n

Le 10 mars la com\u00e8te 2P\/Encke est pass\u00e9e au p\u00e9rih\u00e9lie \u00e0 50 millions de km du Soleil. Elle \u00e9tait \u00e0 ce moment en conjonction avec Mercure \u00e0 0,3\u00b0 (\u00e9cart apparent) de la premi\u00e8re plan\u00e8te du Syst\u00e8me solaire (image ci-dessus).<\/p>\n","protected":false},"excerpt":{"rendered":"

Mercure et la com\u00e8te 2P\/Encke sont actuellement visibles dans le champ du coronographe LASCO C3 de l\u2019observatoire solaire SOHO. SOHO (Solar and Heliospheric Observatory) est un satellite d\u2019une masse de 1,8 tonne qui a \u00e9t\u00e9 plac\u00e9 au point de Lagrange L1 \u00e0 environ 1,5 million de km de notre plan\u00e8te, l\u00e0 ou l\u2019attraction de la … Continuer la lecture de Une com\u00e8te croise une plan\u00e8te dans le coronographe de SOHO<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7493,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1352,868,945,140,577,760,1350],"class_list":["post-7479","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-comete-2pencke","tag-coronographe","tag-lasco-c3","tag-mercure","tag-sdo","tag-soho","tag-taurides"],"yoast_head":"\nUne com\u00e8te croise une plan\u00e8te dans le coronographe de SOHO<\/title>\n<meta name=\"description\" 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