{"id":8735,"date":"2008-09-08T13:52:57","date_gmt":"2008-09-08T13:52:57","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/m20-la-nebuleuse-trifide\/"},"modified":"2025-07-14T10:56:08","modified_gmt":"2025-07-14T08:56:08","slug":"m20-la-nebuleuse-trifide","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/m20-la-nebuleuse-trifide\/","title":{"rendered":"M20 la n\u00e9buleuse Trifide"},"content":{"rendered":"

Auteur: Olivier Schreurs (astroliver@gmail.com)<\/p>\n

<< Charles Messier d\u00e9couvrit cet objet le 5 juin 1764 et le d\u00e9crivit comme un amas d'\u00e9toiles de 8\u00e8me et 9\u00e8me magnitude, environn\u00e9 de n\u00e9bulosit\u00e9. \n\nLa n\u00e9buleuse Trifide M20 est fameuse par sa disposition en trois lobes. Ceci explique peut-\u00eatre pourquoi William Herschel, qui normalement \u00e9vitait soigneusement de reporter les objets de Messier dans son catalogue, attribua quatre num\u00e9ros diff\u00e9rents pour d\u00e9signer les parties de cette n\u00e9buleuse. Il aurait finalement retenu cet objet car Messier le pr\u00e9sentait seulement comme un \"amas d'\u00e9toiles\". Le nom de \"Trifide\" a \u00e9t\u00e9 utilis\u00e9 \u00e0 l'origine par John Herschel pour le d\u00e9crire. \nLa n\u00e9buleuse sombre qui est \u00e0 l'origine de l'apparence trifide a \u00e9t\u00e9 catalogu\u00e9e B 85 par Barnard. \n\nComme souvent dans le cas des n\u00e9buleuses, les estimations de magnitude varient beaucoup : Kenneth Glyn Jones donne 9,0 alors que Machholz l'estime \u00e0 6,8. Ceci peut venir du fait que l'\u00e9toile excitatrice ADS 10991 est un syst\u00e8me triple avec une magnitude int\u00e9gr\u00e9e de 7, comprenant les composantes A:7,6, B:10,7, C:8,7. Toutes les trois sont extr\u00eamement chaudes ; la composante A est de type spectral O5 ou O6. La pr\u00e9sence de ce triplet tr\u00e8s brillant complique l'estimation de la magnitude de la n\u00e9buleuse. >>
\n(extrait simplifi\u00e9 de http:\/\/messier.obspm.fr\/f\/m020.html<\/a>)<\/p>\n

EOS 20Da + filtre uhc-s au foyer du newton 255 de la Sal \u00e0 Nandrin en mai dernier.
\n15x 4 minutes, 400 iso. Traitement IRIS, images crop\u00e9es, montr\u00e9es en demi-taille.<\/p>\n

Etoiles en forme de flamme comme sur M16 post\u00e9e hier: l’effet d’un suppos\u00e9 jet-stream \u00ab\u00a0poussant\u00a0\u00bb la lumi\u00e8re du sud-est vers le nord-ouest ?
\nEffet bien visible \u00e0 l’oculaire. Remarques \u00e0 ce sujet bienvenues.
\nOli s<\/p>\n

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

Traitement plus dur
\n\"\"<\/a><\/p>\n\n\n

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\n Veuillez voter<\/span>\n <\/div>\n <\/div>\n","protected":false},"excerpt":{"rendered":"

Auteur: Olivier Schreurs (astroliver@gmail.com)<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[2],"tags":[],"class_list":["post-8735","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8735","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=8735"}],"version-history":[{"count":3,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8735\/revisions"}],"predecessor-version":[{"id":16113,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8735\/revisions\/16113"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=8735"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=8735"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=8735"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}