page 7 NGC 7331

            Astrophotography by Keith B. Quattrocchi

                                                                    NGC 7331
                                           L-RGB Image

                                      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 29 -Oct 7, 2007                              
                               Time:30 x 20 min for L (10 hrs) and  20 x 30 min for RGB ( 30 hrs).                
                               Processing:  CCD Stack and PhotoShop CS/2
Image Information:  NGC 7331 is a bright edge on spiral galaxy often referred to as our galaxies “twin”.  It is believed to harbor a massive black hole at it’s center, just as our galaxy appears to harbor.   It is 50 million light years away .   
Processing Comments:  RGB Color combine in Maxim DL.  L and RGB combined in Photoshop CS2. Data stretching in Maxim and PS(curves) and further processing (minimal) in Photoshop CS/2. Image intentionally under processed to decrease artifact.

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