{"id":2547,"date":"2021-01-10T16:58:54","date_gmt":"2021-01-10T21:58:54","guid":{"rendered":"https:\/\/ciel-astro-ccd.com\/wp\/?page_id=2547"},"modified":"2023-08-21T15:35:31","modified_gmt":"2023-08-21T19:35:31","slug":"m92_pol","status":"publish","type":"page","link":"https:\/\/ciel-astro-ccd.com\/wp\/m92_pol\/","title":{"rendered":"M 92"},"content":{"rendered":"\n
\"\"\/<\/a>
Cliquer sur l’image pour l’afficher plein \u00e9cran<\/em><\/figcaption><\/figure>\n\n\n\n
Date<\/strong>
2017\/05\/21 et 2017\/06\/13

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 \u2013 Diam\u00e8tre 203 mm (8\u2019\u2019), focale 2032 mm, f\/10<\/td><\/tr>
R\u00e9ducteur de focale<\/td>f\/6.3 (63 %)<\/td><\/tr>
Monture<\/td>Celestron CGEM<\/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 en parall\u00e8le avec L\u2019Orion mini guider<\/td><\/tr>
Pr\u00e9cision d\u2019autoguidage (RMS)<\/td>1,43\u2019\u2019 d\u2019arc (2,86\u2019\u2019 d\u2019arc au total) et 1,89\u2019\u2019 d\u2019arc (3,78\u2019\u2019 d\u2019arc au total)<\/td><\/tr>
Type d\u2019image<\/td>L(RVsB)
Vs pour vert synth\u00e9tique<\/td><\/tr>
Exposition<\/td>Luminance (49 x 1\u2019 bin 2×2), Rouge (30 x 2\u2019 Bin 2×2) et bleu (29 x 2\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>
Traitement sp\u00e9cifique<\/td>Cr\u00e9er une couche verte synth\u00e9tique<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Descripton de l\u2019objet<\/strong><\/h4>\n\n\n\n
Type d\u2019objet<\/td>Amas globulaire <\/td><\/tr>
Constellation<\/td>Hercule<\/td><\/tr>
Magnitude visuelle<\/td>6,5<\/td><\/tr>
Distance<\/td>26000 ann\u00e9es-lumi\u00e8re<\/td><\/tr>
Diam\u00e8tre<\/td>110 ann\u00e9es-lumi\u00e8re<\/td><\/tr>
Dimension vue de la Terre<\/td>14 minutes d\u2019arc  <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
M92 est l’un des amas globulaires les plus brillants de l’h\u00e9misph\u00e8re Nord. Il est souvent n\u00e9glig\u00e9 par les astronomes amateurs en raison de sa proximit\u00e9 avec M13 qui est l\u2019amas globulaire le plus spectaculaire de cet l\u2019h\u00e9misph\u00e8re. M92 est aussi l\u2019un des plus anciens amas globulaires. Il est situ\u00e9 \u00e0 26000 ann\u00e9es-lumi\u00e8re du syst\u00e8me solaire et est donc un peu plus \u00e9loign\u00e9 que son voisin M13. Son diam\u00e8tre est d\u2019environ 110 ann\u00e9es-lumi\u00e8re. La concentration en \u00e9toiles de l’amas en son centre est tr\u00e8s importante. La masse de l’amas est \u00e9lev\u00e9e. Elle est d’environ 300000 fois la masse de notre soleil ! L’amas se rapproche de la Terre \u00e0 la vitesse de 110 km\/s. \u00a0

Le rep\u00e9rage visuel de l’amas est assez difficile. Pour le voir, il faut un ciel avec peu de pollution lumineuse. Il est alors visible aux jumelles et a l’aspect d’une tache blanch\u00e2tre diffuse. Il faut un t\u00e9lescope d\u2019au moins 200 mm pour commencer \u00e0 r\u00e9soudre l\u2019amas. \u00a0

Dans mon image, qui a \u00e9t\u00e9 prise \u00e0 mon observatoire personnel situ\u00e9 dans un ciel de pollution lumineuse important (zones grise et blanche), j\u2019ai tout de m\u00eame r\u00e9ussi \u00e0 r\u00e9soudre l\u2019amas en \u00e9toiles jusqu\u2019au centre. Il est \u00e0 noter, pour cette image, je n\u2019ai pas utilis\u00e9 de filtre antipollution lumineuse ! J\u2019ai plut\u00f4t opt\u00e9 pour prendre beaucoup d\u2019images avec des temps de poses individuels courts en profitant de la formule suivante\u00a0: Augmentation du rapport Signal \/ Bruit = \u221a nombre d’images. Vive les math\u00e9matiques et les calculs astronomiques ! <\/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":"

Date2017\/05\/21 et 2017\/06\/13 Lieu d\u2019observationMon observatoir permanent \u00e0 Longueuilen zone de pollution lumineuse blanche Technique T\u00e9lescope Celestron Edge HD \u2013 Diam\u00e8tre 203 mm (8\u2019\u2019), focale 2032 mm, f\/10 R\u00e9ducteur de focale f\/6.3 (63 %) Monture Celestron CGEM Cam\u00e9ra d\u2019imagerie Atik 383 L+ monochrome r\u00e9gul\u00e9e \u00e0 -20o Celsius Cam\u00e9ra d\u2019autoguidage ZWO ASI 120MM en parall\u00e8le avec L\u2019Orion…<\/p>\n

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