{"id":1814,"date":"2021-01-06T13:18:56","date_gmt":"2021-01-06T18:18:56","guid":{"rendered":"https:\/\/ciel-astro-ccd.com\/wp\/?page_id=1814"},"modified":"2023-08-21T15:21:08","modified_gmt":"2023-08-21T19:21:08","slug":"m27_pol","status":"publish","type":"page","link":"https:\/\/ciel-astro-ccd.com\/wp\/m27_pol\/","title":{"rendered":"M 27"},"content":{"rendered":"\n
\"\"\/<\/a>
Cliquer sur l’image pour l’afficher plein \u00e9cran<\/em><\/figcaption><\/figure>\n\n\n\n
Date<\/strong>
2019\/06\/08 et 2019\/07\/07

Lieu d\u2019observation<\/strong>
Mon observatoir permanent \u00e0 Longueuil
en zone de pollution lumineuse blanche<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Technique<\/strong><\/h4>\n\n\n\n
T\u00e9lescope<\/td>Celestron Edge HD – Diam\u00e8tre 203 mm (8\u2019\u2019), focale 2032 mm, f\/10<\/td><\/tr>
Monture<\/td>Celestron CGEM<\/td><\/tr>
R\u00e9ducteur de focale<\/td>f\/6.3 (63 %)<\/td><\/tr>
Cam\u00e9ra d\u2019imagerie<\/td>Atik 383 L+ monochrome r\u00e9gul\u00e9e \u00e0 -20o<\/sup> Celsius<\/td><\/tr>
Cam\u00e9ra d\u2019autoguidage<\/td>ZWO ASI 120MM avec un diviseur optique<\/td><\/tr>
Pr\u00e9cision d\u2019autoguidage (RMS)<\/td>4,69\u2019\u2019 et 2,98\u2019\u2019 d\u2019arc total (en + et en -)<\/td><\/tr>
Type d\u2019image<\/td>Ha(Ha-OIII-OIII)<\/td><\/tr>
Exposition<\/td>Ha (14 x 10\u2019 Bin 2×2) et OIII (10 x 10\u2019 Bin 2×2)<\/td><\/tr>
Logiciel d\u2019acquisition des images<\/td>Maxim DL<\/td><\/tr>
Logiciel de guidage<\/td>PHD Guiding 2<\/td><\/tr>
Pr\u00e9traitement<\/td>Maxim DL<\/a><\/td><\/tr>
Traitement<\/td>Photoshop et PixInsight<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Descripton de l\u2019objet<\/strong><\/h4>\n\n\n\n
Type d\u2019objet<\/td>N\u00e9buleuse plan\u00e9taire \u00ab La n\u00e9buleuse de l\u2019Halt\u00e8re \u00bb<\/td><\/tr>
Constellation<\/td>Petit Renard<\/td><\/tr>
Magnitude visuelle<\/td>7,4<\/td><\/tr>
Distance<\/td>1400 ann\u00e9es-lumi\u00e8re (varie de 861 \u00e0 2900 ann\u00e9es-lumi\u00e8re selon la source)<\/td><\/tr>
Diam\u00e8tre<\/td>3,2 ann\u00e9es-lumi\u00e8re<\/td><\/tr>
Dimension vue de la Terre<\/td>Dimension : 8 x 5,7 minutes d\u2019arc <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
La n\u00e9buleuse de l’Halt\u00e8re est une n\u00e9buleuse plan\u00e9taire situ\u00e9e dans la constellation du Petit Renard \u00e0 environ 1400 ann\u00e9es-lumi\u00e8re de la Terre. Cette n\u00e9buleuse, d\u00e9couverte par Charles Messier le 12 juillet 1764, est la premi\u00e8re n\u00e9buleuse plan\u00e9taire observ\u00e9e de l’histoire de l’astronomie. Elle porte le num\u00e9ro 27 de son catalogue. Cet objet est particuli\u00e8rement brillant et poss\u00e8de un diam\u00e8tre apparent tr\u00e8s large, puisque la partie la plus lumineuse atteint 1\/5 de celui de la Lune. Sachant que la vitesse d’expansion atteint 6,8 secondes d’arc par si\u00e8cle, son \u00e2ge est estim\u00e9 \u00e0 3000 ou 4000 ans. L’\u00e9toile centrale (non visible sur ma photo qui est obstru\u00e9e par la couche de luminance en H-Alpha), qui est \u00e0 l\u2019origine de la n\u00e9buleuse, a une magnitude apparente de 13,5, ce qui la rend difficilement observable pour un astronome amateur. C’est une naine blanche de couleur bleue tr\u00e8s chaude (85000 K). La forme particuli\u00e8re de la partie lumineuse a valu \u00e0 cet objet le nom de n\u00e9buleuse de l’Halt\u00e8re (Dumbbell en anglais). \u00a0

M27 est une n\u00e9buleuse plan\u00e9taire tr\u00e8s populaire pour l\u2019observation et la photographie astronomiques. Sa magnitude emp\u00eache son observation \u00e0 l’\u0153il nu, mais avec des jumelles 10 x 50, dans un site de faible pollution lumineuse, on peut esp\u00e9rer voir M27. \u00c0 partir d’un t\u00e9lescope de 150 ou 200 mm, on obtient plus facilement le brillant c\u0153ur ou trognon de la n\u00e9buleuse. Avec un t\u00e9lescope de 300 mm, muni d’un filtre interf\u00e9rentiel de type OIII (recommand\u00e9 pour l’observation de n\u00e9buleuses plan\u00e9taires et diffuses), le trognon appara\u00eet nettement et l’\u00e9toile centrale peut \u00eatre envisag\u00e9e, mais seulement sous un ciel sans pollution lumineuse : l’utilisation de la vision d\u00e9cal\u00e9e permet de mieux voir cette naine blanche. \u00a0

Pour mon image prise dans un site de pollution lumineuse important (zone blanche), j\u2019ai utilis\u00e9 les filtres \u00e0 bandes passantes \u00e9troites Ha et OIII. Cela m\u2019a permis d\u2019aller chercher beaucoup de d\u00e9tails fins de la n\u00e9buleuse plan\u00e9taire qui \u00e9met la majorit\u00e9 de son signal dans ces spectres lumineux. Ces filtres servent aussi \u00e0 combattre efficacement la pollution lumineuse extr\u00eame de mon site d\u2019observation. Pour aller chercher le maximum de d\u00e9tails dans la partie \u2018\u2019 Halt\u00e8re \u2018\u2019 de la n\u00e9buleuse (de tonalit\u00e9s rouges), j\u2019ai utilis\u00e9 le filtre H-Alpha comme image de luminance. Par contre, d\u00fb \u00e0 l\u2019importance du signal Ha de la n\u00e9buleuse, l\u2019\u00e9toile centrale (naine blanche de magnitude de 13,5) a \u00e9t\u00e9 voil\u00e9e par celui-ci. Mon choix a donc \u00e9t\u00e9 orient\u00e9 dans la pr\u00e9sentation des tr\u00e8s belles nuances et couleurs de la n\u00e9buleuse. Le filtre Ha a servi \u00e0 faire ressortir les nuances de la n\u00e9buleuse dans les tonalit\u00e9s rouges et le filtre OIII \u00e0 pr\u00e9senter les tonalit\u00e9s bleues de celle-ci.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Richard Beauregard
Le Ciel Astro \u2013 CCD
Mon impression \u00ab Nous ne pouvons pas \u00eatre seuls dans ce gigantesque univers \u00bb<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

Date2019\/06\/08 et 2019\/07\/07 Lieu d\u2019observationMon observatoir permanent \u00e0 Longueuilen zone de pollution lumineuse blanche Technique T\u00e9lescope Celestron Edge HD – Diam\u00e8tre 203 mm (8\u2019\u2019), focale 2032 mm, f\/10 Monture Celestron CGEM R\u00e9ducteur de focale f\/6.3 (63 %) Cam\u00e9ra d\u2019imagerie Atik 383 L+ monochrome r\u00e9gul\u00e9e \u00e0 -20o Celsius Cam\u00e9ra d\u2019autoguidage ZWO ASI 120MM avec un diviseur optique…<\/p>\n

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