{"id":5391,"date":"2016-12-20T16:28:58","date_gmt":"2016-12-20T15:28:58","guid":{"rendered":"http:\/\/outters.fr\/?p=5391"},"modified":"2025-07-15T17:04:10","modified_gmt":"2025-07-15T16:04:10","slug":"m27-hoo-rvb","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=5391","title":{"rendered":"M27 HOO-rvb"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-background-position:left top;--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-top:20px;--awb-padding-bottom:20px;--awb-border-sizes-top:0px;--awb-border-sizes-bottom:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:calc( 1800px + 0px );margin-left: calc(-0px \/ 2 );margin-right: calc(-0px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column fusion-flex-align-self-flex-start fusion-column-no-min-height\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:0px;--awb-margin-bottom-large:0px;--awb-spacing-left-large:0px;--awb-width-medium:100%;--awb-spacing-right-medium:0px;--awb-spacing-left-medium:0px;--awb-width-small:100%;--awb-spacing-right-small:0px;--awb-spacing-left-small:0px;\"><div class=\"fusion-column-wrapper fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-1 fusion-title-center fusion-title-text fusion-title-size-two\" style=\"--awb-sep-color:#dd9933;\"><div class=\"title-sep-container title-sep-container-left\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:#dd9933;\"><\/div><\/div><span class=\"awb-title-spacer\"><\/span><h2 class=\"fusion-title-heading title-heading-center fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:24;line-height:;\"><p style=\"text-align: left;\"><span style=\"color: #ff9900;\"> <strong>M27 en HOO-rvb<\/strong><br \/>\n<\/span><\/p><\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:#dd9933;\"><\/div><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container hundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-overflow:visible;--awb-margin-top:30px;--awb-margin-bottom:30px;--awb-background-color:rgba(255,255,255,0);--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"width:calc( 100% + 0px ) !important;max-width:calc( 100% + 0px ) !important;margin-left: calc(-0px \/ 2 );margin-right: calc(-0px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_1 1_1 fusion-flex-column fusion-flex-align-self-flex-start fusion-column-no-min-height\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:0px;--awb-margin-bottom-large:0px;--awb-spacing-left-large:0px;--awb-width-medium:100%;--awb-spacing-right-medium:0px;--awb-spacing-left-medium:0px;--awb-width-small:100%;--awb-spacing-right-small:0px;--awb-spacing-left-small:0px;\"><div class=\"fusion-column-wrapper fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;width:100%;\"><div class=\"fusion-separator-border sep-shadow\" style=\"--awb-height:20px;--awb-amount:20px;background:radial-gradient(ellipse at 50% -50% , #3e3e3e 0px, rgba(255, 255, 255, 0) 80%) repeat scroll 0 0 rgba(0, 0, 0, 0);background:-webkit-radial-gradient(ellipse at 50% -50% , #3e3e3e 0px, rgba(255, 255, 255, 0) 80%) repeat scroll 0 0 rgba(0, 0, 0, 0);background:-moz-radial-gradient(ellipse at 50% -50% , #3e3e3e 0px, rgba(255, 255, 255, 0) 80%) repeat scroll 0 0 rgba(0, 0, 0, 0);background:-o-radial-gradient(ellipse at 50% -50% , #3e3e3e 0px, rgba(255, 255, 255, 0) 80%) repeat scroll 0 0 rgba(0, 0, 0, 0);\"><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-3 fusion-flex-container hundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-overflow:visible;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"width:104% !important;max-width:104% !important;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-position:center center;--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:50%;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:3.84%;--awb-width-small:100%;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element \" style=\"text-align:center;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-1 hover-type-none\"><a class=\"fusion-no-lightbox\" href=\"http:\/\/outters.fr\/wp-content\/uploads\/2016\/12\/m27-Hao3-rvb13.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" alt=\"M27\" src=\"http:\/\/outters.fr\/wp-content\/uploads\/2016\/12\/m27-Hao3-rvb13-900x868.jpg\" class=\"img-responsive\"\/><\/a><\/span><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-3 fusion_builder_column_1_2 1_2 fusion-flex-column fusion-animated\" style=\"--awb-bg-size:cover;--awb-border-color:#000000;--awb-border-top:0px;--awb-border-right:0px;--awb-border-bottom:0px;--awb-border-left:0px;--awb-border-style:solid;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:50%;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:3.84%;--awb-width-small:100%;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-animationType=\"zoomInDown\" data-animationDuration=\"0.1\" data-animationOffset=\"top-into-view\"><div class=\"fusion-column-wrapper fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-content-boxes content-boxes columns row fusion-columns-3 fusion-columns-total-4 fusion-content-boxes-1 content-boxes-clean-horizontal content-left content-boxes-icon-on-side\" style=\"--awb-body-color:#ffffff;--awb-title-color:#dd8500;--awb-hover-accent-color:var(--awb-custom_color_4);--awb-circle-hover-accent-color:var(--awb-custom_color_4);\" data-animationOffset=\"top-into-view\"><div style=\"--awb-backgroundcolor:transparent;--awb-content-padding-left:46px;border-color:rgba(255,255,255,0);\" class=\"fusion-column content-box-column content-box-column content-box-column-1 col-lg-4 col-md-4 col-sm-4 fusion-content-box-hover content-box-column-first-in-row\"><div class=\"col content-box-wrapper content-wrapper link-area-link-icon link-type-text icon-hover-animation-fade\" data-animationOffset=\"top-into-view\"><div class=\"heading heading-with-icon icon-left\"><a class=\"heading-link\" href=\"http:\/\/outters.fr\/wp-content\/uploads\/2016\/12\/m27-Hao3-rvb13.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"><div class=\"icon\"><i style=\"border-color:#3e3e3e;border-width:1px;background-color:#3e3e3e;box-sizing:content-box;height:24px;width:24px;line-height:24px;border-radius:50%;font-size:12px;\" aria-hidden=\"true\" class=\"fontawesome-icon fa fa-arrows circle-yes fa-spin\"><\/i><\/div><h2 class=\"content-box-heading fusion-responsive-typography-calculated\" style=\"--h2_typography-font-size:18px;--fontSize:18;line-height:;padding-left:46px;\">Image HOO-rvb<\/h2><\/a><\/div><\/div><\/div><div style=\"--awb-backgroundcolor:transparent;--awb-content-padding-left:46px;border-color:rgba(255,255,255,0);\" class=\"fusion-column content-box-column content-box-column content-box-column-2 col-lg-4 col-md-4 col-sm-4 fusion-content-box-hover \"><div class=\"col content-box-wrapper content-wrapper link-area-link-icon link-type-text icon-hover-animation-fade\" data-animationOffset=\"top-into-view\"><div class=\"heading heading-with-icon icon-left\"><a class=\"heading-link\" href=\"http:\/\/outters.fr\/wp-content\/uploads\/2016\/12\/m27-Ha.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"><div class=\"icon\"><i style=\"border-color:#3e3e3e;border-width:1px;background-color:#3e3e3e;box-sizing:content-box;height:24px;width:24px;line-height:24px;border-radius:50%;font-size:12px;\" aria-hidden=\"true\" class=\"fontawesome-icon fa fa-arrows circle-yes fa-spin\"><\/i><\/div><h2 class=\"content-box-heading fusion-responsive-typography-calculated\" style=\"--h2_typography-font-size:18px;--fontSize:18;line-height:;padding-left:46px;\">Image Ha<\/h2><\/a><\/div><\/div><\/div><div style=\"--awb-backgroundcolor:transparent;--awb-content-padding-left:46px;border-color:rgba(255,255,255,0);\" class=\"fusion-column content-box-column content-box-column content-box-column-3 col-lg-4 col-md-4 col-sm-4 fusion-content-box-hover content-box-column-last-in-row\"><div class=\"col content-box-wrapper content-wrapper link-area-link-icon link-type-text icon-hover-animation-fade\" data-animationOffset=\"top-into-view\"><div class=\"heading heading-with-icon icon-left\"><a class=\"heading-link\" href=\"http:\/\/outters.fr\/wp-content\/uploads\/2016\/12\/m27-o3.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"><div class=\"icon\"><i style=\"border-color:#3e3e3e;border-width:1px;background-color:#3e3e3e;box-sizing:content-box;height:24px;width:24px;line-height:24px;border-radius:50%;font-size:12px;\" aria-hidden=\"true\" class=\"fontawesome-icon fa fa-arrows circle-yes\"><\/i><\/div><h2 class=\"content-box-heading fusion-responsive-typography-calculated\" style=\"--h2_typography-font-size:18px;--fontSize:18;line-height:;padding-left:46px;\">Image OIII<\/h2><\/a><\/div><\/div><\/div><div style=\"--awb-backgroundcolor:transparent;--awb-content-padding-left:46px;border-color:rgba(255,255,255,0);\" class=\"fusion-column content-box-column content-box-column content-box-column-4 col-lg-4 col-md-4 col-sm-4 fusion-content-box-hover content-box-column-first-in-row content-box-column-last\"><div class=\"col content-box-wrapper content-wrapper link-area-link-icon icon-hover-animation-fade\" data-animationOffset=\"top-into-view\"><div class=\"heading heading-with-icon icon-left\"><div class=\"icon\"><i style=\"border-color:#3e3e3e;border-width:1px;background-color:#3e3e3e;box-sizing:content-box;height:24px;width:24px;line-height:24px;border-radius:50%;font-size:12px;\" aria-hidden=\"true\" class=\"fontawesome-icon fa fa-arrows circle-yes\"><\/i><\/div><\/div><\/div><\/div><div class=\"fusion-clearfix\"><\/div><\/div><div class=\"fusion-alert alert error alert-danger fusion-alert-center awb-alert-native-link-color alert-dismissable awb-alert-close-boxed\" role=\"alert\"><div class=\"fusion-alert-content-wrapper\"><span class=\"alert-icon\"><i class=\"awb-icon-exclamation-triangle\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-alert-content\">Incorrect slider name. Please make sure to use a valid slider slug.<\/span><\/div><button type=\"button\" class=\"close toggle-alert\" data-dismiss=\"alert\" aria-label=\"Close\">&times;<\/button><\/div><div class=\"fusion-title title fusion-title-2 fusion-title-center fusion-title-text fusion-title-size-one\" style=\"--awb-sep-color:#dd9933;\"><div class=\"title-sep-container title-sep-container-left\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:#dd9933;\"><\/div><\/div><span class=\"awb-title-spacer\"><\/span><h1 class=\"fusion-title-heading title-heading-center fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:;--minFontSize:0;line-height:;\"><p style=\"text-align: center;\"><span style=\"color: #ff9900;\">Commentaires sur l&rsquo;objet photographi\u00e9<\/span><\/p><\/h1><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:#dd9933;\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-1\"><p><img decoding=\"async\" class=\"size-thumbnail wp-image-2168 alignleft\" src=\"http:\/\/outters.fr\/wp-content\/uploads\/2016\/06\/outters-nicolas-150x150.jpg\" alt=\"outters-nicolas\" width=\"150\" height=\"150\" srcset=\"https:\/\/www.outters.fr\/wp-content\/uploads\/2016\/06\/outters-nicolas-66x66.jpg 66w, https:\/\/www.outters.fr\/wp-content\/uploads\/2016\/06\/outters-nicolas-150x150.jpg 150w, https:\/\/www.outters.fr\/wp-content\/uploads\/2016\/06\/outters-nicolas.jpg 765w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/p>\n<p>C&rsquo;est la deuxi\u00e8me image apr\u00e8s une reprise difficile de l&rsquo;observatoire Sirene.<\/p>\n<p>M27 semble \u00eatre un objet facile \u00e0 imager, d\u00e9trompez vous, le traitement est assez complexe car les couches Ha et OIII se superposent assez bien au centre et il est difficile de trouver un bon compromis. On retrouve les d\u00e9tails du centre de la n\u00e9buleuse dans les images du VLT et de Hubble.<\/p>\n<p>La couche RVB permet de retrouver des \u00e9toiles de couleurs naturelles.<\/p>\n<p>Voici une animation de la n\u00e9buleuse faite avec les filtres OIII et Ha en haute r\u00e9solution.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-3 fusion-title-center fusion-title-text fusion-title-size-two\" style=\"--awb-sep-color:#dd9933;\"><div class=\"title-sep-container title-sep-container-left\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:#dd9933;\"><\/div><\/div><span class=\"awb-title-spacer\"><\/span><h2 class=\"fusion-title-heading title-heading-center fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:24;line-height:;\"><p style=\"text-align: left;\"><span style=\"color: #ff9900;\">Donn\u00e9es techniques<br \/>\n<\/span><\/p><\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:#dd9933;\"><\/div><\/div><\/div><div class=\"fusion-content-boxes content-boxes columns row fusion-columns-2 fusion-columns-total-2 fusion-content-boxes-2 content-boxes-clean-horizontal content-left content-boxes-icon-on-side\" style=\"--awb-title-color:#dd9933;--awb-hover-accent-color:var(--awb-custom_color_4);--awb-circle-hover-accent-color:var(--awb-custom_color_4);\" data-animationOffset=\"top-into-view\"><div style=\"--awb-backgroundcolor:transparent;--awb-content-padding-left:46px;border-color:rgba(255,255,255,0);\" class=\"fusion-column content-box-column content-box-column content-box-column-1 col-lg-6 col-md-6 col-sm-6 fusion-content-box-hover content-box-column-first-in-row\"><div class=\"col content-box-wrapper content-wrapper link-area-link-icon icon-hover-animation-fade\" data-animationOffset=\"top-into-view\"><div class=\"heading heading-with-icon icon-left\"><div class=\"icon\"><i style=\"border-color:#3e3e3e;border-width:1px;background-color:#3e3e3e;box-sizing:content-box;height:24px;width:24px;line-height:24px;border-radius:50%;font-size:12px;\" aria-hidden=\"true\" class=\"fontawesome-icon fa fa-camera circle-yes\"><\/i><\/div><h2 class=\"content-box-heading fusion-responsive-typography-calculated\" style=\"--h2_typography-font-size:18px;--fontSize:18;line-height:;padding-left:46px;\">Donn\u00e9es techniques de prise de vue<\/h2><\/div><div class=\"fusion-clearfix\"><\/div><div class=\"content-container\">Object : M27<br \/>\nCommon name : N\u00e9buleuse de l&rsquo;halt\u00e8re<br \/>\nDate images Du 11 ao\u00fbt au 29 septembre 2016<br \/>\nOptics : Rcos 12.5&Prime;<br \/>\nMount : Paramount ME Num\u00e9ro 3<br \/>\nLocation : Sirene observatory<br \/>\nSeeing : fwhm : 1.39 \u00e0 2.17<br \/>\nCcd : Apogee 16U<br \/>\nfilter wheel : Apogee<br \/>\nfilters : Astrodon<br \/>\nHa OIII rvb<br \/>\nFocuser :TIM<br \/>\nGuiding : Atik 314L+<br \/>\nTemp. out : T\u00b0 8.3 \u00e0 15.2<br \/>\nTemp ccd : -25\u00b0<br \/>\nTotal exposure : 23.16 h<br \/>\ntout en binning 1&#215;1<\/p>\n<p>RVB : 14 x 5&prime; par couche couleur<br \/>\nHa : 30 x 20&prime;<br \/>\nOIII ; 29 x 20&prime;<\/div><\/div><\/div><div style=\"--awb-backgroundcolor:transparent;--awb-content-padding-left:46px;border-color:rgba(255,255,255,0);\" class=\"fusion-column content-box-column content-box-column content-box-column-2 col-lg-6 col-md-6 col-sm-6 fusion-content-box-hover content-box-column-last content-box-column-last-in-row\"><div class=\"col content-box-wrapper content-wrapper link-area-link-icon icon-hover-animation-fade\" data-animationOffset=\"top-into-view\"><div class=\"heading heading-with-icon icon-left\"><div class=\"icon\"><i style=\"border-color:#3e3e3e;border-width:1px;background-color:#3e3e3e;box-sizing:content-box;height:24px;width:24px;line-height:24px;border-radius:50%;font-size:12px;\" aria-hidden=\"true\" class=\"fontawesome-icon fa fa-joomla circle-yes\"><\/i><\/div><h2 class=\"content-box-heading fusion-responsive-typography-calculated\" style=\"--h2_typography-font-size:18px;--fontSize:18;line-height:;padding-left:46px;\">Donn\u00e9es scientifiques<\/h2><\/div><div class=\"fusion-clearfix\"><\/div><div class=\"content-container\">La <b>n\u00e9buleuse de l&rsquo;Halt\u00e8re<\/b> est une <a title=\"N\u00e9buleuse plan\u00e9taire\" href=\"https:\/\/fr.wikipedia.org\/wiki\/N%C3%A9buleuse_plan%C3%A9taire\">n\u00e9buleuse plan\u00e9taire<\/a> situ\u00e9e dans la constellation du <a title=\"Petit Renard\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Petit_Renard\">Petit Renard<\/a> \u00e0 environ\u00a0<span class=\"nowrap\">264\u00a0<a title=\"Parsec\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Parsec\">pc<\/a><\/span> <span class=\"nowrap\">(\u223c861\u00a0<a title=\"Ann\u00e9e-lumi\u00e8re\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Ann%C3%A9e-lumi%C3%A8re\">a.l.<\/a>)<\/span>. Cette n\u00e9buleuse, d\u00e9couverte par <a title=\"Charles Messier\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Charles_Messier\">Charles Messier<\/a> le <time class=\"nowrap date-lien\" datetime=\"1764-07-12\"><a title=\"12 juillet\" href=\"https:\/\/fr.wikipedia.org\/wiki\/12_juillet\">12 juillet<\/a> <a title=\"1764\" href=\"https:\/\/fr.wikipedia.org\/wiki\/1764\">1764<\/a><\/time>, est la premi\u00e8re n\u00e9buleuse plan\u00e9taire observ\u00e9e de l&rsquo;histoire de l&rsquo;<a title=\"Astronomie\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Astronomie\">astronomie<\/a>. Elle porte le num\u00e9ro 27 de son <a class=\"mw-redirect\" title=\"Catalogue Messier\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Catalogue_Messier\">catalogue<\/a>.<\/p>\n<p>Cet objet est particuli\u00e8rement brillant et poss\u00e8de un <a class=\"mw-redirect\" title=\"Diam\u00e8tre apparent\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Diam%C3%A8tre_apparent\">diam\u00e8tre apparent<\/a> tr\u00e8s large, puisque la partie la plus lumineuse atteint 1\/5 de celui de la <a title=\"Lune\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Lune\">Lune<\/a>. Sachant que la vitesse d&rsquo;expansion atteint 6,8 <a class=\"mw-redirect\" title=\"Seconde d'arc\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Seconde_d%27arc\">secondes d&rsquo;arc<\/a> par si\u00e8cle, son \u00e2ge est estim\u00e9 \u00e0 3000 ou 4000 ans.<\/p>\n<p>L&rsquo;<a title=\"\u00c9toile\" href=\"https:\/\/fr.wikipedia.org\/wiki\/%C3%89toile\">\u00e9toile<\/a> centrale (\u00e0 l&rsquo;origine de la <a title=\"N\u00e9buleuse\" href=\"https:\/\/fr.wikipedia.org\/wiki\/N%C3%A9buleuse\">n\u00e9buleuse<\/a>) a une <a title=\"Magnitude apparente\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Magnitude_apparente\">magnitude apparente<\/a> de 13,5, ce qui la rend difficilement observable pour un astronome amateur. C&rsquo;est une <a title=\"Naine blanche\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Naine_blanche\">naine blanche<\/a> de couleur bleue tr\u00e8s chaude (85\u00a0000<a title=\"Kelvin\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Kelvin\">K<\/a>). Elle est peut-\u00eatre accompagn\u00e9e d&rsquo;une autre <a title=\"\u00c9toile\" href=\"https:\/\/fr.wikipedia.org\/wiki\/%C3%89toile\">\u00e9toile<\/a>, encore plus faible (magnitude 17), \u00e0 6,5 secondes d&rsquo;arc de distance apparente.<\/p>\n<p>La forme particuli\u00e8re de la partie lumineuse a valu \u00e0 cette n\u00e9buleuse le nom de <i>N\u00e9buleuse de l&rsquo;Halt\u00e8re<\/i> (<i>Dumbbell<\/i> en anglais). On lui conna\u00eet \u00e9galement les surnoms de <i>Trognon de <a title=\"Pomme\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Pomme\">pomme<\/a><\/i>, de <i><a title=\"Sablier\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Sablier\">Sablier<\/a><\/i> (attention \u00e0 la confusion avec d&rsquo;autres objets\u00a0!) voire de <i><a title=\"Diabolo (jonglerie)\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Diabolo_%28jonglerie%29\">Diabolo<\/a><\/i>.<\/p>\n<h2><span id=\"Observation\" class=\"mw-headline\">Observation<\/span><\/h2>\n<div class=\"thumbinner\">\n<p><a class=\"image\" href=\"https:\/\/commons.wikimedia.org\/wiki\/File:Vulpecula_constellation_map.svg?uselang=fr\"><img decoding=\"async\" class=\"thumbimage\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/9\/94\/Vulpecula_constellation_map.svg\/220px-Vulpecula_constellation_map.svg.png\" srcset=\"\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/9\/94\/Vulpecula_constellation_map.svg\/330px-Vulpecula_constellation_map.svg.png 1.5x, \/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/9\/94\/Vulpecula_constellation_map.svg\/440px-Vulpecula_constellation_map.svg.png 2x\" alt=\"\" width=\"220\" height=\"171\" data-file-width=\"320\" data-file-height=\"249\" \/><\/a><\/p>\n<div class=\"thumbcaption\"><\/div>\n<\/div>\n<div class=\"thumb tright\">\n<div class=\"thumbinner\">\n<div class=\"thumbcaption\">Position de la n\u00e9buleuse dans la constellation du Petit Renard<\/div>\n<\/div>\n<\/div>\n<p>Sa magnitude emp\u00eache son observation \u00e0 l&rsquo;\u0153il nu, mais avec des <a title=\"Jumelles\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Jumelles\">jumelles<\/a> 10&#215;50 et de bonnes conditions <a title=\"M\u00e9t\u00e9orologie\" href=\"https:\/\/fr.wikipedia.org\/wiki\/M%C3%A9t%C3%A9orologie\">m\u00e9t\u00e9o<\/a>, on peut esp\u00e9rer voir M27. \u00c0 partir d&rsquo;un <a title=\"T\u00e9lescope\" href=\"https:\/\/fr.wikipedia.org\/wiki\/T%C3%A9lescope\">t\u00e9lescope<\/a> de 150 ou <span class=\"nowrap\">200\u00a0mm<\/span>, on obtient plus facilement le brillant \u00ab\u00a0trognon\u00a0\u00bb. Il est encore trop t\u00f4t pour esp\u00e9rer voir l&rsquo;<a title=\"\u00c9toile\" href=\"https:\/\/fr.wikipedia.org\/wiki\/%C3%89toile\">\u00e9toile<\/a> centrale (qui ne se d\u00e9voilera qu&rsquo;en <a title=\"Astrophotographie\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Astrophotographie\">photographie<\/a> \u00e0 ce niveau). Avec un <span class=\"nowrap\">300\u00a0mm<\/span>, muni d&rsquo;un filtre interf\u00e9rentiel de type OIII (recommand\u00e9 pour l&rsquo;observation de n\u00e9buleuses plan\u00e9taire et diffuses), le trognon appara\u00eet nettement et l&rsquo;\u00e9toile centrale peut \u00eatre envisag\u00e9e mais seulement sous un tr\u00e8s bon ciel, sans pollution parasite, sans turbulence (l&rsquo;appareil doit \u00eatre \u00e0 temp\u00e9rature)\u00a0: l&rsquo;utilisation de la vision d\u00e9cal\u00e9e permet de mieux voir cette naine blanche. Toutefois, sous un ciel de tr\u00e8s haute qualit\u00e9 (dans le Quercy, en haute montagne, en Dr\u00f4me proven\u00e7ale) plusieurs astronomes amateurs ont observ\u00e9 cette \u00e9toile centrale dans des t\u00e9lescopes de <span class=\"nowrap\">250\u00a0mm<\/span>.<\/p>\n<p>Elle est observable entre <a title=\"Mai\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Mai\">mai<\/a> et <a title=\"Septembre\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Septembre\">septembre<\/a> environ. Elle se situe dans la <a title=\"Constellation\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Constellation\">constellation<\/a> du <a title=\"Petit Renard\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Petit_Renard\">Petit Renard<\/a>, soit en plein <a title=\"Triangle d'\u00e9t\u00e9\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Triangle_d%27%C3%A9t%C3%A9\">Triangle d&rsquo;\u00e9t\u00e9<\/a>. La recherche de l&rsquo;objet est relativement facile, voici les \u00e9tapes \u00e0 suivre avec un t\u00e9lescope\u00a0:<\/p>\n<ol>\n<li>Dans ce Triangle d&rsquo;\u00e9t\u00e9, rep\u00e9rer la <a title=\"Constellation\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Constellation\">constellation<\/a> de la <a title=\"Fl\u00e8che (constellation)\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Fl%C3%A8che_%28constellation%29\">Fl\u00e8che<\/a> (<i>Sagitta<\/i>, Sge).<\/li>\n<li>Avec le viseur du t\u00e9lescope, pointer exactement sur l&rsquo;\u00e9toile \u00e0 la pointe de la Fl\u00e8che (\u00e9toile de couleur rouge)<\/li>\n<li>Placer l&rsquo;<a title=\"\u0152il\" href=\"https:\/\/fr.wikipedia.org\/wiki\/%C5%92il\">\u0153il<\/a> sur l&rsquo;<a title=\"Oculaire\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Oculaire\">oculaire<\/a> et monter en <a title=\"D\u00e9clinaison (astronomie)\" href=\"https:\/\/fr.wikipedia.org\/wiki\/D%C3%A9clinaison_%28astronomie%29\">D\u00e9clinaison<\/a>.<\/li>\n<\/ol>\n<p>Pendant cette remont\u00e9e, une tache floue devrait se d\u00e9tacher du reste des \u00e9toiles environnantes\u00a0: c&rsquo;est Dumbbell. En observant plus longuement, on distingue cette forme qui la caract\u00e9rise.<\/p>\n<table class=\"infobox_v2\">\n<tbody>\n<tr>\n<th colspan=\"2\">Donn\u00e9es d\u2019observation<br \/>\n<small>(<a title=\"\u00c9poque (astronomie)\" href=\"https:\/\/fr.wikipedia.org\/wiki\/%C3%89poque_%28astronomie%29\">\u00c9poque<\/a> <a title=\"J2000.0\" href=\"https:\/\/fr.wikipedia.org\/wiki\/J2000.0\">J2000.0<\/a>)<\/small><\/th>\n<\/tr>\n<tr>\n<th scope=\"row\"><a title=\"Constellation\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Constellation\">Constellation<\/a><\/th>\n<td><a title=\"Petit Renard\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Petit_Renard\">Petit Renard<\/a><\/td>\n<\/tr>\n<tr>\n<th scope=\"row\"><a title=\"Ascension droite\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Ascension_droite\">Ascension droite<\/a> (\u03b1)<\/th>\n<td>19<sup>h<\/sup>\u00a059<sup>m<\/sup>\u00a036,34<sup>s<\/sup><\/td>\n<\/tr>\n<tr>\n<th scope=\"row\"><a title=\"D\u00e9clinaison (astronomie)\" href=\"https:\/\/fr.wikipedia.org\/wiki\/D%C3%A9clinaison_%28astronomie%29\">D\u00e9clinaison<\/a> (\u03b4)<\/th>\n<td>+22\u00b0\u00a043\u2032\u00a016,1\u2033<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Distance<\/th>\n<td>environ\u00a0<span class=\"nowrap\">264\u00a0<a title=\"Parsec\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Parsec\">pc<\/a><\/span> <span class=\"nowrap\">(\u223c861\u00a0<a title=\"Ann\u00e9e-lumi\u00e8re\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Ann%C3%A9e-lumi%C3%A8re\">a.l.<\/a>)<\/span><\/td>\n<\/tr>\n<tr>\n<th scope=\"row\"><a title=\"Magnitude apparente\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Magnitude_apparente\">Magnitude apparente<\/a> <small>(V)<\/small><\/th>\n<td>7,4<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Dimensions apparentes <small>(V)<\/small><\/th>\n<td>8,0 \u00d7 5,7 min d&rsquo;arc<\/td>\n<\/tr>\n<tr>\n<th colspan=\"2\">Caract\u00e9ristiques physiques<\/th>\n<\/tr>\n<tr>\n<th scope=\"row\">Type d&rsquo;objet<\/th>\n<td><a title=\"N\u00e9buleuse plan\u00e9taire\" href=\"https:\/\/fr.wikipedia.org\/wiki\/N%C3%A9buleuse_plan%C3%A9taire\">N\u00e9buleuse plan\u00e9taire<\/a><\/td>\n<\/tr>\n<tr>\n<th colspan=\"2\">D\u00e9couverte<\/th>\n<\/tr>\n<tr>\n<th scope=\"row\">D\u00e9couvreur(s)<\/th>\n<td><a title=\"Charles Messier\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Charles_Messier\">Charles Messier<\/a><\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Date<\/th>\n<td><time class=\"nowrap date-lien\" datetime=\"1764-07-12\"><a title=\"12 juillet\" href=\"https:\/\/fr.wikipedia.org\/wiki\/12_juillet\">12 juillet<\/a> <a title=\"1764\" href=\"https:\/\/fr.wikipedia.org\/wiki\/1764\">1764<\/a><\/time><\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">D\u00e9signation(s)<\/th>\n<td>M27, NGC 6853<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div><\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-4 fusion_builder_column_1_1 1_1 fusion-flex-column 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80%) repeat scroll 0 0 rgba(0, 0, 0, 0);background:-moz-radial-gradient(ellipse at 50% -50% , #3e3e3e 0px, rgba(255, 255, 255, 0) 80%) repeat scroll 0 0 rgba(0, 0, 0, 0);background:-o-radial-gradient(ellipse at 50% -50% , #3e3e3e 0px, rgba(255, 255, 255, 0) 80%) repeat scroll 0 0 rgba(0, 0, 0, 0);\"><\/div><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":5432,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[152,238,102,108,110,111,122,128],"tags":[],"class_list":["post-5391","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-toutes-categories","category-saison-2016","category-nebuleuse","category-telescope-rc300","category-catalogues","category-messier","category-haoiii-rvb","category-observatoire-sirene","post_format-post-format-image"],"_links":{"self":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts\/5391","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5391"}],"version-history":[{"count":23,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts\/5391\/revisions"}],"predecessor-version":[{"id":6854,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts\/5391\/revisions\/6854"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/media\/5432"}],"wp:attachment":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5391"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5391"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5391"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}