{"id":11595,"date":"2020-01-20T17:48:18","date_gmt":"2020-01-20T17:48:18","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11595"},"modified":"2020-02-17T21:58:58","modified_gmt":"2020-02-17T21:58:58","slug":"moisson-de-nebuleuses-planetaires-pour-deux-amateurs","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/01\/20\/moisson-de-nebuleuses-planetaires-pour-deux-amateurs\/","title":{"rendered":"Moisson de n\u00e9buleuses plan\u00e9taires pour deux amateurs"},"content":{"rendered":"<p><strong>La recherche de n\u00e9buleuses plan\u00e9taires sur les images digitalis\u00e9es du ciel est devenue la sp\u00e9cialit\u00e9 de certains astronomes amateurs m\u00e9ticuleux.\u00a0<\/strong><\/p>\n<h5>Agonie stellaire :<\/h5>\n<p>Les n\u00e9buleuses plan\u00e9taires (<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-nebuleuse-planetaire-51\/\" target=\"_blank\" rel=\"noopener noreferrer\">NP<\/a>) portent un nom qui peut pr\u00eater \u00e0 confusion. On le doit uniquement \u00e0 leur aspect circulaire qui les faisait passer pour des plan\u00e8tes dans les t\u00e9lescopes imparfaits de nos a\u00efeux. Il s\u2019agit en r\u00e9alit\u00e9 d\u2019une enveloppe gazeuse \u00e9ject\u00e9e par des \u00e9toiles tr\u00e8s chaudes. Elles deviennent instables en fin de vie, lorsqu\u2019elles ont atteint le stade de naine blanche. Les astronomes estiment que notre Galaxie pourrait compter 30.000 NP dont seulement 10% ont \u00e9t\u00e9 d\u00e9couvertes \u00e0 ce jour.<\/p>\n<figure id=\"attachment_7835\" aria-describedby=\"caption-attachment-7835\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/hibou.jpg\" rel=\"lightbox[11595]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-7835\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/hibou-450x305.jpg\" alt=\"\" width=\"450\" height=\"305\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/hibou-450x305.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/hibou-768x520.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/hibou-1024x693.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/hibou.jpg 1330w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-7835\" class=\"wp-caption-text\">Messier 97, la n\u00e9buleuse plan\u00e9taire du Hibou. \u00a9 Keith Quattrocchi<\/figcaption><\/figure>\n<p>Certaines NP sont particuli\u00e8rement c\u00e9l\u00e8bres, comme Messier 97 (le\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/27\/messier-97-nebuleuse-planetaire-hibou\/\" target=\"_blank\" rel=\"noopener noreferrer\">Hibou<\/a>, image ci-dessus) ou Messier 27 (la n\u00e9buleuse\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/11\/09\/zoom-letonnante-nebuleuse-planetaire-dumbbell\/\" target=\"_blank\" rel=\"noopener noreferrer\">Dumbbell<\/a>). Mais la majorit\u00e9 d\u2019entre elles sont beaucoup plus discr\u00e8tes. Elles restent encore \u00e0 d\u00e9couvrir.<!--more--><\/p>\n<h5>Le domaine des amateurs motiv\u00e9s :<\/h5>\n<p>Depuis une dizaine d&#8217;ann\u00e9es un groupe d&#8217;astronomes amateurs confirm\u00e9s s&#8217;est regroup\u00e9 autour de\u00a0<a href=\"http:\/\/www.cielocean.fr\/\" target=\"_blank\" rel=\"noopener noreferrer\">Pascal Le D\u00fb<\/a> (avec le soutien de l\u2019astrophysicienne\u00a0<a href=\"http:\/\/astro.u-strasbg.fr\/~acker\/agnes.html\" target=\"_blank\" rel=\"noopener noreferrer\">Agn\u00e8s Acker<\/a>). Leur ambition : d\u00e9nicher de nouvelles n\u00e9buleuses plan\u00e9taires qui auraient \u00e9chapp\u00e9 aux grands t\u00e9lescopes. Ils ont mis au point des protocoles de prises de vues tr\u00e8s \u00e9labor\u00e9s et ont r\u00e9alis\u00e9 ainsi plusieurs centaines de d\u00e9couvertes. On peut prendre connaissance de ce remarquable travail sur le site <a href=\"http:\/\/planetarynebulae.net\/\" target=\"_blank\" rel=\"noopener noreferrer\"><em>PlanetaryNebulae.net<\/em><\/a>\u00a0dans lequel Pascal Le D\u00fb et Thomas Petit (de l\u2019<a href=\"http:\/\/www.atacama-photographic-observatory.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">APO<\/a>) ont rassembl\u00e9 toutes les actualit\u00e9s et catalogues des n\u00e9buleuses plan\u00e9taires francophones.<\/p>\n<figure id=\"attachment_11596\" aria-describedby=\"caption-attachment-11596\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr.jpg\" rel=\"lightbox[11595]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11596\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr-450x289.jpg\" alt=\"\" width=\"450\" height=\"289\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr-450x289.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr-1024x659.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr-768x494.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr.jpg 1399w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-11596\" class=\"wp-caption-text\">StDr 13, une nouvelle n\u00e9buleuse plan\u00e9taire d\u00e9nich\u00e9e dans la constellation de la Licorne par le tandem franco-allemand Xavier Strottner\/Marcel Drechsler. \u00a9 Andreas Bringmann<\/figcaption><\/figure>\n<h5>Un tandem franco-allemand :<\/h5>\n<p>Certains de ces amateurs ont choisi de mener cette recherche non pas en photographiant le ciel mais en \u00e9pluchant les images digitalis\u00e9es disponibles sur\u00a0<em><a href=\"https:\/\/aladin.u-strasbg.fr\/aladin-f.gml\" target=\"_blank\" rel=\"noopener noreferrer\">Aladin Sky Atlas<\/a>. <\/em>C&#8217;est le cas de l&#8217;astronome amateur fran\u00e7ais Xavier Strottner (catalogue <a href=\"http:\/\/planetarynebulae.net\/FR\/page_np_resultat.php?id=306\" target=\"_blank\" rel=\"noopener noreferrer\">St<\/a> avec 67 NP) et de l&#8217;astrophotographe allemand <a href=\"https:\/\/www.astrobin.com\/users\/Marcel_Drechsler\/\" target=\"_blank\" rel=\"noopener noreferrer\">Marcel Drechsler<\/a> (catalogue <a href=\"http:\/\/planetarynebulae.net\/FR\/page_np_resultat.php?id=437\" target=\"_blank\" rel=\"noopener noreferrer\">Dr<\/a> avec 37 NP). Ils ont d\u00e9cid\u00e9 d&#8217;unir leurs comp\u00e9tences avec le soutien de Dana Patchick.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr3.jpg\" rel=\"lightbox[11595]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-11601\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr3-450x179.jpg\" alt=\"\" width=\"450\" height=\"179\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr3-450x179.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr3-1024x408.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr3-768x306.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr3.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Leur catalogue (<a href=\"http:\/\/planetarynebulae.net\/FR\/page_np_resultat.php?id=709\" target=\"_blank\" rel=\"noopener noreferrer\">StDr<\/a>) compte d\u00e9j\u00e0 16 d\u00e9couvertes qui attendent d&#8217;\u00eatre confirm\u00e9es par l&#8217;obtention d&#8217;un spectre de la NP, un travail men\u00e9 par Pascal Le D\u00fb. Ce dernier a d\u00e9j\u00e0 obtenu 4 spectres sur les objets StDr 2, StDr 4, StDr 12 et StDr 13. &#8220;<em>Ils ont tous montr\u00e9 de belles raies en \u00e9mission. Les candidates StDr 12 et StDr 13 se distinguent du lot car elles montrent essentiellement des raies n\u00e9bulaires typique de NP (doublet [OIII], raies [NII] et Halpha)<\/em>.&#8221; L&#8217;un des plus beaux objets de ce catalogue est d&#8217;ailleurs <a href=\"http:\/\/planetarynebulae.net\/FR\/page_article.php?id=40\" target=\"_blank\" rel=\"noopener noreferrer\">StDr 13<\/a> dans la constellation de la Licorne qui a \u00e9t\u00e9 imag\u00e9 en d\u00e9cembre dernier par l&#8217;astrophotographe <a href=\"https:\/\/www.astrobin.com\/axwn6w\/\" target=\"_blank\" rel=\"noopener noreferrer\">Andreas Bringmann<\/a>.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr13.jpg\" rel=\"lightbox[11595]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-11597\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr13-450x237.jpg\" alt=\"\" width=\"450\" height=\"237\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr13-450x237.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr13-768x404.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/01\/stdr13.jpg 997w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>La recherche de n\u00e9buleuses plan\u00e9taires sur les images digitalis\u00e9es du ciel est devenue la sp\u00e9cialit\u00e9 de certains astronomes amateurs m\u00e9ticuleux.\u00a0 Agonie stellaire : Les n\u00e9buleuses plan\u00e9taires (NP) portent un nom qui peut pr\u00eater \u00e0 confusion. On le doit uniquement \u00e0 leur aspect circulaire qui les faisait passer pour des plan\u00e8tes dans les t\u00e9lescopes imparfaits de &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/01\/20\/moisson-de-nebuleuses-planetaires-pour-deux-amateurs\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Moisson de n\u00e9buleuses plan\u00e9taires pour deux amateurs<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":11596,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[2780,896,904,2779],"class_list":["post-11595","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-marcel-drechsler","tag-nebuleuse-planetaire","tag-pascal-le-du","tag-xavier-strottner"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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