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M 101  (NGC  5457),  in   Ursa  Major

 Date  2004-07-11
 Scope

 Astro-Physics 130 EDF at f6.0 on A-P 1200GTO mount; ST-4 guiding via separate guidescope

 SBIG ST-10XME CCD camera with CFW-8 color wheel controlled with MaxIm DL/CCD v4.01          

 Exposures  L=26x300 sec, R=6x300 sec, G=6x300 sec, B=6x300 sec, all unbinned      
 Processing 

 Calibrated and gradients removed MaxIm. Blooms removed with Wodaski's Debloomer. 

  RGB assembled in MaxIm. Luminance and RGB registered with RegiStar. L and RGB

  combined in Photoshop and then separately stretched and unsharp masked or blurred. 

  Finally flattened and converted to jpg.

 

Here is an older image:

     M101 is a large Milky-Way-like galaxy in Ursa Major, about 25 million light-years (ly) distant. It is estimated to be 190,000 ly in diameter and to exceed the brightness of the Milky Way by about 2.5-fold. It was discovered in 1781. This image was captured over two nights with a bright 40+% moon shining.

 Date  2002-04-21, 22
 Scope

 Astro-Physics 130 EDF at f4.5 on A-P 1200GTO mount; ST-4 guiding

 Meade 416XTE CCD camera with 616 color wheel controlled with MaxIm DL/CCD v3.05           

 Exposures  L=15x300 sec, R=8x300 sec, G=8x300 sec, B=8x300 sec, all unbinned      
 Processing 

 Calibrated and RGB assembled in MaxIm. Luminance enhanced with DDP in MaxIm. L and RGB

 combined in Photoshop and then separately stretched and unsharp masked or blurred. Finally flattened

 and converted to jpg.

 

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