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
Filters: Astrodon L, R, G, B, Ha, SII, OIII
Mount: Software Bisque Paramount ME
Acquisition Programs: The Sky,CCDAutopliot III, CCD Soft.
Processing Programs: CCDStack, Maxim DL, Photoshop
Date: September 30 -October 20, 2008
Time: 15x20 min ( 5
hours) each for each of L, R, G, B:
Total of 20 hours imaging time.
Processing: CCD Stack and PhotoShop CS/3
Image Infornmation: LRGB image
of NGC 891 in Adromeda. This is a relatively faint 13' x 2.8' edge on spiral galaxy known for it's faint dust lane and
the unusual 'vertical' (aiming away from the central regions)filamentary nebular patterns. The vertical filaments are
thought to be due to a supernova or other catastophic event. The galaxy is about 30 million light years
Additional Comments: The image was first assebled as an RGB object in CCDStack. In order to avoid star halos, the DDP
option was not used and the image stretched manually ('maximum' right/'gamma' left and then decreased background to avoid
clipping). The RGB and luminance layers were assembled in Photoshop CS3 (normal mode). A second layer of
the galaxy core, enhancing the filamentary patterns, was layered onto this composite. Further data stretching,
high pass filtering and background smoothing was performed with Adobe Photoshop CS/3.