{"id":10499,"date":"2024-02-27T17:51:10","date_gmt":"2024-02-27T17:51:10","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/holmes-4\/"},"modified":"2025-06-08T22:43:53","modified_gmt":"2025-06-08T20:43:53","slug":"holmes-4","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/holmes-4\/","title":{"rendered":"Holmes"},"content":{"rendered":"

Salut,<\/p>\n

retour en 2007 avec la com\u00e8te 17\/P Holmes.
\nCaptur\u00e9e \u00e0 l’aide du Nikon D80 objectif 135mm F\/5.6 iso800 divers temps de poses entre 30 et 90 secondes<\/p>\n

Traitement classique PI . Ici on ne per\u00e7oit pas le d\u00e9placement de la com\u00e8te par rapport aux \u00e9toiles. Probablement li\u00e9 \u00e0 la focale tr\u00e8s courte.<\/p>\n

La diff\u00e9rence de position de la com\u00e8te entre les deux images est due au fait que la premi\u00e8re version a \u00e9t\u00e9 captur\u00e9e le 12 novembre 2007 et la seconde version est issue d’images du 16 novembre 2007.<\/p>\n

Je n’ai pas retrouv\u00e9 les RAW du 12, seulement les JPEG. Je n’ai pas essay\u00e9 de combiner RAW et JPEG dans PI. Pas certain que cela puisse fonctionner.<\/p>\n

La com\u00e8te \u00e9tait effectivement lente \u00e0 cette p\u00e9riode (16 arcsec\/heure d’apr\u00e8s Horizon System du JPL). Avec le D80 et ses pixels de 6,1 microns et la focale de 135 je pouvais poser 30 minutes sans que le mouvement de la com\u00e8te soit per\u00e7u. <\/p>\n

Comme pr\u00e9c\u00e9demment un petit avant\/apr\u00e8s. Les outils de traitement ont bien \u00e9volu\u00e9 et cela vaut la peine de repasser des anciennes images \u00e0 la moulinette.<\/p>\n

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

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

JM<\/p>\n\n\n

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

Salut, retour en 2007 avec la com\u00e8te 17\/P Holmes. Captur\u00e9e \u00e0 l’aide du Nikon D80 objectif 135mm F\/5.6 iso800 divers temps de poses entre 30 et 90 secondes Traitement classique PI . Ici on ne per\u00e7oit pas le d\u00e9placement de la com\u00e8te par rapport aux \u00e9toiles. Probablement li\u00e9 \u00e0 la focale tr\u00e8s courte. La diff\u00e9rence […]<\/p>\n","protected":false},"author":10,"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-10499","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10499","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\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=10499"}],"version-history":[{"count":1,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10499\/revisions"}],"predecessor-version":[{"id":11190,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10499\/revisions\/11190"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=10499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=10499"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=10499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}