page 6 NGC 6946

                       Astrophotography by Keith B. Quattrocchi

                    NGC 6946
                    Spiral Galaxy In Cepheus
                    LLRGB Image
                    Published:  Sky and Telescope Gallery, February 2008


                                      Image Acquisition Information                      
                               Telescope:   16" RCOS Ritchey-Chretien Telescope (ion milled at f/9) 
                               Camera:       SBIG STL-6303 M
                               Guiding:       Astrodon  MOAG AOG (SBIG 237 with .65 FLR)
                               Filters:        Astrodon L, R, G, B
                               Mount:        Software Bisque Paramount ME
                               Acquisition Programs:   The Sky,CCDAutopliot III, CCD Soft. 
                               Processing ProgramsCCDStack, Maxim DL, Photoshop
                               Date:Sept 9 -Sept 16, 2007                              
                               Time:30 x 20 min for L (10 hrs) and  20 x 20 min for RGB ( 20 hrs).                
                               Processing:  CCD Stack and PhotoShop CS/2
Image Information:  NGC 6946, at 10 million light years distance, is known for it's unusually large number of supernovas.
Processing Comments:  The image is an RGB Color image, combined in Maxim DL.  L and RGB combined in Photoshop CS2. Data stretching (curves) and further processing (minimal) in Photoshop CS/2. Image intentionally under processed to decrease artifact.

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