{"id":6397,"date":"2016-10-18T15:34:23","date_gmt":"2016-10-18T15:34:23","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6397"},"modified":"2016-10-26T06:03:33","modified_gmt":"2016-10-26T06:03:33","slug":"coupoles-de-lobservatoire-mauna-kea-vues-de-lespace","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/10\/18\/coupoles-de-lobservatoire-mauna-kea-vues-de-lespace\/","title":{"rendered":"Les coupoles de l’Observatoire du Mauna Kea vues de l’espace"},"content":{"rendered":"

\u00c0 quoi peut ressembler l’Observatoire du Mauna Kea vu depuis l’espace ? R\u00e9ponse avec cette image r\u00e9alis\u00e9e par l’un des petits satellites CubeSat.<\/strong><\/p>\n

L\u2019Observatoire du Mauna Kea<\/a>\u00a0h\u00e9berge une dizaine de t\u00e9lescopes de 1 \u00e0 10 m\u00e8tres de diam\u00e8tre appartenant \u00e0 diff\u00e9rents pays au sommet du volcan Mauna Kea sur l\u2019\u00eele d\u2019Hawa\u00ef<\/a>, \u00e0 4.205 m\u00e8tres d\u2019altitude (la France dispose l\u00e0-bas d\u2019un t\u00e9lescope de 3,6 m\u00e8tres, le T\u00e9lescope Canada-France-Hawa\u00ef<\/a>).<\/p>\n

Il y a quelques mois je vous avais pr\u00e9sent\u00e9 le site du Very Large Telescope au Chili vu de satellite<\/a>, une image r\u00e9alis\u00e9e par l\u2019un des satellites Pl\u00e9iades. Cette fois c’est l’Observatoire du Mauna Kea que l’on d\u00e9couvre vu du ciel, photographi\u00e9 par un CubeSat.<\/p>\n

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

De nombreux c\u00f4nes volcaniques pars\u00e8ment le sommet st\u00e9rile du Mauna Kea. On remarque au milieu de cette r\u00e9gion d\u00e9sertique la petite tache verte du lac Waiau, le seul lac alpin d’Hawa\u00ef (il se situe \u00e0 plus de 4.000 m\u00e8tres d’altitude). Ce plan d’eau, aliment\u00e9 par les pr\u00e9cipitations hivernales, voit sa taille se r\u00e9duire dramatiquement depuis quelques ann\u00e9es en raison d’une s\u00e9cheresse importante.<\/p>\n

\"mauna_kea2\"<\/a><\/p>\n

Les CubeSat sont des nanosatellites en forme de cube d’un d\u00e9cim\u00e8tre de c\u00f4t\u00e9 (l’\u00e9quivalent d’un volume de 1 litre) pour une masse de 1,33 kilo. <\/p>\n

Imagin\u00e9s en 1999 par deux universit\u00e9s am\u00e9ricaines (l’universit\u00e9 polytechnique de Californie et l’universit\u00e9 Stanford), ils sont plac\u00e9s en orbite basse (moins de 2.000 km d’altitude). On a m\u00eame pr\u00e9vu de les regrouper pour emporter des charges utiles plus grandes : ce sera le cas pour les MarCO (Mars Cube One<\/em>), des CubeSat martiens constitu\u00e9s de six unit\u00e9s et destin\u00e9s \u00e0 surveiller l’arriv\u00e9e sur la Plan\u00e8te rouge<\/a> de l’atterrisseur InSight <\/em><\/a>dont le lancement est pr\u00e9vu pour 2018.<\/p>\n

Vous pourrez d\u00e9couvrir d’autres sites astronomiques vus de l’espace sur la page Pictures of Telescopes by Telescopes<\/em><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00c0 quoi peut ressembler l’Observatoire du Mauna Kea vu depuis l’espace ? R\u00e9ponse avec cette image r\u00e9alis\u00e9e par l’un des petits satellites CubeSat. L\u2019Observatoire du Mauna Kea\u00a0h\u00e9berge une dizaine de t\u00e9lescopes de 1 \u00e0 10 m\u00e8tres de diam\u00e8tre appartenant \u00e0 diff\u00e9rents pays au sommet du volcan Mauna Kea sur l\u2019\u00eele d\u2019Hawa\u00ef, \u00e0 4.205 m\u00e8tres d\u2019altitude … Continuer la lecture de Les coupoles de l’Observatoire du Mauna Kea vues de l’espace<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":6398,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[1847,831,1848,830,1850,1849,3],"class_list":["post-6397","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-cubesat","tag-hawai","tag-lac-waiau","tag-mauna-kea","tag-nanosatellite","tag-observatoire-du-mauna-kea","tag-volcan"],"yoast_head":"\nLes coupoles de l'Observatoire du Mauna Kea vues de l'espace<\/title>\n<meta name=\"description\" content=\"\u00c0 quoi peut ressembler l'Observatoire du Mauna Kea vu depuis l'espace ? 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