page25LLRGBngc5921

































                     Astrophotography by Keith B. Quattrocchi
















                                NGC 5921                 
                Barred Spiral Galaxy Serpens Caput
                L-LRGB Image
            Published in "Astronomy" Gallery, October 1, 2009 
                              Copyright 2009
                            Keith B Quattrocchi

ngc5921web.v3.llrgb.jpg




                                      Image Acquisition Information                      
 
                               Telescope:   16" RCOS Richey Chretien Telescope (ion milled at 6/9) 
                               Camera:       SBIG STL-6303 M
                               Guiding:       SBIG AOL,  Astrodon  MOAG AOG (SBIG 237 with FLR)
                               Filters:        Astrodon Ha, SII, OIII
                               Mount:        Software Bisque Paramount ME
                               Acquisition Programs:   The Sky,CCDAutopliot III, CCD Soft. 
                               Processing ProgramsCCDStack, Maxim DL, Photoshop
                               Date: June 7-June 13, 2008                              
                               Time: 12x20 min ( 4 hours) each for each of L, R, G, B:
                               Total of 16 hours imaging time.                              
                               Processing:  CCD Stack and PhotoShop CS/3
 
Image Infornmation:  NGC 5921 is a barred spiral galaxy in serpens caput, approximately 65 million light years distant.  It is relatively small, measuring 4.8 x 4 arc-minutes in size and has a magnitude of 11.5.  The barred nucleus and it's multiple spiral arms can be clearly seen. 
Additional Comments:  Image processing with CCDStack, producing an LRGB image.  The LRGB and separate Luminance images were combined in Photoshop CS/3 (twice, first using soft light option then with the overlay option).  Further data stretching, high pass filtering and background smoothing (Kodac Gem) performed with Adobe Photoshop CS/3.
 
 
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