{"id":7418,"date":"2015-05-06T11:34:11","date_gmt":"2015-05-06T09:34:11","guid":{"rendered":"http:\/\/www.db-prods.net\/blog\/?p=7418"},"modified":"2017-12-08T13:17:32","modified_gmt":"2017-12-08T12:17:32","slug":"coucher-de-soleil-sur-mars","status":"publish","type":"post","link":"https:\/\/www.db-prods.net\/blog\/2015\/05\/06\/coucher-de-soleil-sur-mars\/","title":{"rendered":"Coucher de Soleil \u2026 sur Mars"},"content":{"rendered":"

Avant m\u00eame que le rover Curiosity n’arrive sur Mars, la description des cam\u00e9ras couleurs me faisait r\u00eaver. Et rapidement, je me suis mise \u00e0 imaginer les merveilleuses images que l’on pourrait obtenir d’un coucher ou d’un lever de Soleil sur Mars.
\nSol 956, 15 Avril 2015. Trois ans. Il aura fallu attendre trois ans avant que l’\u00e9quipe en charge de la mission daigne ENFIN pointer les puissantes MASTCAM vers un coucher de Soleil. Et il va sans dire que les images sont merveilleuses.<\/p>\n

Ces images sont arriv\u00e9es en noir et blanc, avec matrice de Bayer. Il m’aura donc fallu les passer \u00e0 la moulinette Gimp et G’MIC pour reconstruire les couleurs. Un passage dans Pixelmator pour retirer les horribles bandes verticales blanches dues \u00e0 la surcharge dans les pixels. Un coup d’antibruit pour enlever les art\u00e9facts de la matrice de Bayer, et voil\u00e0 !<\/p>\n

Voici les images de ce sol, toutes en format PNG. Les deux derni\u00e8res vues ont \u00e9t\u00e9 faites avec la Mastcam100.<\/p>\n

Way before Curiosity’s Mars landing, the color camera description made me dream. And quickly, I had imagine what wonderful pictures we can get of sunset or sunrises on Mars.<\/em>
\nSol 956, 15th April of 2015. Three years. We had to wait three years before the team who is charge of the mission dare AT LEAST pointing the powerful MASTCAM toward a sunset. And I have to say, theses images are gorgeous !<\/em><\/p>\n

Theses images came in black and white, with a Bayer matrix. I had to process them through Gimp and G’MIC in order to rebuild the colors. A little processing in Pixelmator to remove these ugly white stripes due to pixels overloading. A little bit of denoising to remove Bayer matrix artifacts, et voil\u00e0 !<\/em><\/p>\n

Here is the images of this sol, all in PNG format. The two last frames were taken by Mastcam100.<\/em><\/p>\n

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EDIT : Une planche pour montrer les diff\u00e9rences entre un coucher de Soleil sur Terre, et sur Mars. L’angle de champs est strictement le m\u00eame, ainsi que les proportions. Il est fascinant de se dire que c’est la m\u00eame \u00e9toile que l’on voit sur les deux images. Deux mondes, Un Soleil.<\/p>\n

A board to show differences between a sunset on Earth and Mars. The field of view is strictly the same, also the proportions. It is fascinating to tell ourselves that this is the same star we are seeing on these two pictures. Two worlds, one Sun.<\/p>\n

EDIT 2 [08\/12\/2017] : Planche refaite avec une image provenant du Planetary Data System, montrant une image de bien meilleure qualit\u00e9. Board remastered with a\u00a0picture from the Planetary Data system, showing an improved quality of the\u00a0picture.<\/em><\/p>\n

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 <\/p>\n","protected":false},"excerpt":{"rendered":"

Avant m\u00eame que le rover Curiosity n’arrive sur Mars, la description des cam\u00e9ras couleurs me faisait r\u00eaver. Et rapidement, je me suis mise \u00e0 imaginer les merveilleuses images que l’on pourrait obtenir d’un coucher ou d’un lever de Soleil sur Mars. Sol 956, 15 Avril 2015. Trois ans. Il aura fallu attendre trois ans avant […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[76,82,77],"tags":[],"class_list":["post-7418","post","type-post","status-publish","format-standard","hentry","category-mars-astronomie","category-paysage","category-soleil"],"_links":{"self":[{"href":"https:\/\/www.db-prods.net\/blog\/wp-json\/wp\/v2\/posts\/7418","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.db-prods.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.db-prods.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.db-prods.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.db-prods.net\/blog\/wp-json\/wp\/v2\/comments?post=7418"}],"version-history":[{"count":7,"href":"https:\/\/www.db-prods.net\/blog\/wp-json\/wp\/v2\/posts\/7418\/revisions"}],"predecessor-version":[{"id":8451,"href":"https:\/\/www.db-prods.net\/blog\/wp-json\/wp\/v2\/posts\/7418\/revisions\/8451"}],"wp:attachment":[{"href":"https:\/\/www.db-prods.net\/blog\/wp-json\/wp\/v2\/media?parent=7418"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.db-prods.net\/blog\/wp-json\/wp\/v2\/categories?post=7418"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.db-prods.net\/blog\/wp-json\/wp\/v2\/tags?post=7418"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}