page 38 NGC 4535

                      Astrophotography by Keith B. Quattrocchi

               NGC 4535 
                Spiral Galaxy in Virgo
                LLRGB Image
             Published in Sky and Telescope Gallery: December 2009
               Copyright 2009
                                       Keith B Quattrocchi


                                      Image Acquisition Information                      
                               Telescope:   16" RCOS Richey Chretien Telescope (ion milled at f/9) 
                               Camera:       SBIG STL-6303 M
                               Guiding:       SBIG AOL,  Astrodon  MOAG AOG (SBIG 237 with Custom FLR to
                                                 expand the FOV)
                               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: May 8, 2008 - May 25, 2009                              
                               Time: 18x20 min ( 6 hours) each for each of L, R, G, B.
                               Total of 24 hours imaging time.                              
                               Processing:  CCD Stack and PhotoShop CS/3
Image Infornmation:  This image is a multi-layered modified LLRGB image of NGC 4535, a small (7.1 by 6 arc-min) face on spiral galaxy in Virgo.  Based on Cepheid variable information  NGC 4535 is estimated to be 54 million light years distant.  It has a large number of forground stars which "pepper" the image.  It has an apparent  magnitue of 9.8.  There are several interesting background faint galaxies, one of which (upper left) is irregular and colorful. 
Additional Comments:  This image is a modified LLRGB composite.  An LRGB image was obtained using CCDStack and optimized in Photoshop CS/3.  This was then layered against an optimized (in Photoshop) luminance image (6 hour subframe image) with the process repeated twice, once with a luminance image and once with a modified LRGB image (accentuating some of the prominant H-alpha regions).  This was then further processed in Photoshop CS/3 (such as highlight/shadows and selective high pass filtering). 

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