{"id":390,"date":"2023-10-25T18:47:12","date_gmt":"2023-10-25T16:47:12","guid":{"rendered":"http:\/\/astroenbaiedarmor.astrosurf.com\/?p=390"},"modified":"2024-06-14T17:26:32","modified_gmt":"2024-06-14T15:26:32","slug":"le-jour-de-la-nuit-2023","status":"publish","type":"post","link":"https:\/\/astroenbaiedarmor.astrosurf.com\/?p=390","title":{"rendered":"Le Jour de la Nuit 2023"},"content":{"rendered":"\n

ABA a particip\u00e9 au 15\u00e8me Jour de la Nuit le samedi 14 octobre 2023 sur le site du Terrain des sports de La M\u00e9augon, rue de la ville Rault, de 20h30 \u00e0 01h00 du matin.<\/p>\n\n\n\n

Nous avons ainsi re\u00e7u la visite d\u2019une vingtaine de personnes au total.<\/p>\n\n\n\n

Apr\u00e8s 22h30, le ciel s\u2019est d\u00e9gag\u00e9 et nous avons pu observer Saturne et Jupiter, au-dessus de la queue de la Baleine. Nous avons admir\u00e9 le ciel d\u2019\u00e9t\u00e9 qui se couche et celui d\u2019hiver que se l\u00e8ve, sans oublier la r\u00e9gion de la constellation de P\u00e9gase avec la c\u00e9l\u00e8bre galaxie d\u2019Androm\u00e8de et bien d\u2019autres objets c\u00e9lestes du catalogue de Messier. Nous avons montr\u00e9 les constellations, montrer certains objets visibles \u00e0 l\u2019\u0153il nu et aux jumelles comme le double amas de Pers\u00e9e, les Pl\u00e9iades. Avec les nombreux instruments, les personnes pr\u00e9sentes ont pu d\u00e9couvrir les anneaux de Saturne et son satellite Titan, les bandes nuageuses de Jupiter avec \u00e0 sa droite son petit satellite Io, et \u00e0 sa gauche en allant vers l\u2019ext\u00e9rieur Europe, Ganym\u00e8de et Callisto. Des galaxies et des n\u00e9buleuses, dans une ambiance humide et fraiche, avec quelques cris de chouettes hulottes ou effraies… Enfin nous avons pu voir quelques \u00e9toiles filantes, beaucoup de passages d\u2019avions et quelques satellites.<\/p>\n\n\n\n

Ce fut une opportunit\u00e9 pour mesurer la qualit\u00e9 du ciel nocturne. Tout d’abord vers 21h20, juste avant l’extinction de l’\u00e9clairage public de La M\u00e9augon, dans une trou\u00e9e nuageuse, une premi\u00e8re mesure du SQM (sky quality measurement<\/em>) \u00e0 20.0 magnitude\/arcsec2<\/sup>, ensuite vers 22h15 : 20,5 magnitude\/arcsec2<\/sup>, et enfin \u00e0 22h55 : 20,7 voire 20,8 magnitude\/arcsec2<\/sup> ce qui fait du ciel de La Maugon un ciel de transition rural urbain, de degr\u00e9 4 sur l\u2019\u00e9chelle de Bortle<\/a>.<\/p>\n\n\n\n

Le Jour de la Nuit a \u00e9t\u00e9 cr\u00e9\u00e9 pour populariser la lutte contre la pollution lumineuse et la pr\u00e9servation de la biodiversit\u00e9 nocturne. Ainsi la d\u00e9couverte du ciel \u00e9toil\u00e9 ne doit pas \u00ab \u00e9clipser \u00bb ce pourquoi cette animation existe.<\/p>\n\n\n\n

\"\"
\u00bb Lors de la 15e \u00e9dition du Jour de la nuit, Alain Le Gu\u00e9 expliquera ce qu\u2019est un bon et mauvais \u00e9clairage<\/figcaption><\/figure>\n\n\n\n

Un grand merci \u00e0 Alain Le Gu\u00e9, Jacques Vincent, Dominique Le Breton, Jean No\u00ebl Antoine, Jean Michel et Antoine Porcher d’ABA, Jean Marc Labb\u00e9, maire de La M\u00e9augon ainsi qu’Yvon Maros et Sylviane Mauviel pour leurs articles de presse.<\/p>\n\n\n\n

\n
Lire le compte-rendu complet…<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

ABA a particip\u00e9 au 15\u00e8me Jour de la Nuit le samedi 14 octobre 2023 sur le site du Terrain des sports de La M\u00e9augon, rue de la ville Rault, de 20h30 \u00e0 01h00 du matin…<\/p>\n","protected":false},"author":1,"featured_media":452,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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