{"id":9341,"date":"2012-07-08T14:13:43","date_gmt":"2012-07-08T14:13:43","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/hla-ngc-6302\/"},"modified":"2025-07-03T18:56:38","modified_gmt":"2025-07-03T16:56:38","slug":"hla-ngc-6302","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/hla-ngc-6302\/","title":{"rendered":"HLA – NGC 6302"},"content":{"rendered":"

La m\u00e9t\u00e9o \u00e9tant vraiment impraticable ces derniers temps, je suis pass\u00e9 au plan B, \u00e0 savoir traiter une image venant du net.
\nIl s’agit ici d’une image captur\u00e9e par Hubble, et mise \u00e0 disposition du public \u00e0 travers le HLA, Hubble Legacy Archive: http:\/\/hla.stsci.edu\/<\/a>
\nJ’ai trouv\u00e9 quelques explications sur le HLA dans un article de Robert Gendler, paru dans le Sky & Telescope de juillet 2012.<\/p>\n

Pour cet essai,
\n1. j’ai choisi une classe d’objets g\u00e9n\u00e9ralement petits et peu accessibles – \u00e0 quelques exceptions pr\u00e8s: les n\u00e9buleuses plan\u00e9taires.
\n2. L’objet devait \u00eatre peu ou pas accessible dans nos r\u00e9gions; j’ai choisi de chercher dans les d\u00e9clinaisons n\u00e9gatives.
\n3. L’objet devait avoir \u00e9t\u00e9 photographi\u00e9 dans au moins 3 longueurs d’ondes par Hubble, afin de cr\u00e9er facilement une image en trichromie.<\/p>\n

Plusieurs objets pr\u00e9s\u00e9lectionn\u00e9s dans une banque de donn\u00e9es ont \u00e9t\u00e9 non retenus, principalement car le HLA n\u2019en disposant que d’images sur 2 longueurs d’ondes; j’arrive ensuite \u00e0 NGC6302 qui est photographi\u00e9 sur 6 longueurs d’ondes. Et c’est un bel objet!<\/p>\n

L’image pr\u00e9sent\u00e9e ici se base sur les captures prises avec le d\u00e9tecteur WFC3 (Wide Field Camera 3) combin\u00e9 aux filtres \u00e0 bande \u00e9troite centr\u00e9s sur:
\n – 673nm (Sii), dur\u00e9e de 5200s,
\n – 658nm (Nii), dur\u00e9e de 2220s,
\n – 373nm (O2), dur\u00e9e de 5600s.
\nDur\u00e9e totale: ~3h30
\nCes images ont \u00e9t\u00e9 respectivement attribu\u00e9es aux canaux RGB.<\/p>\n

Le champ est de ~2.5×2.0 Arcmin, la r\u00e9solution est de 0.04″\/pixel sur une image \u00e0 100%.<\/p>\n

L’image r\u00e9duite \u00e0 25%:
\n\"\"<\/a><\/p>\n

Le coeur, r\u00e9duit \u00e0 50%:
\n\"\"<\/a><\/p>\n

L’image en pleine r\u00e9solution:
\n\"\"<\/a><\/p>\n

Alexandre,<\/p>\n\n\n

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

La m\u00e9t\u00e9o \u00e9tant vraiment impraticable ces derniers temps, je suis pass\u00e9 au plan B, \u00e0 savoir traiter une image venant du net. Il s’agit ici d’une image captur\u00e9e par Hubble, et mise \u00e0 disposition du public \u00e0 travers le HLA, Hubble Legacy Archive: http:\/\/hla.stsci.edu\/ J’ai trouv\u00e9 quelques explications sur le HLA dans un article de […]<\/p>\n","protected":false},"author":16,"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-9341","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9341","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\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=9341"}],"version-history":[{"count":4,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9341\/revisions"}],"predecessor-version":[{"id":15917,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9341\/revisions\/15917"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=9341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=9341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=9341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}