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
Mount: Software Bisque Paramount ME
Acquisition Programs: The Sky,CCDAutopliot III, CCD Soft.
Processing Programs: CCDStack, Maxim DL, Photoshop
Date: June 27-July 4, 2008
Time: 15x20 min ( 5
hours) for each of L, R, G, B:
Total of 20 hours imaging time.
Processing: CCD Stack and PhotoShop CS/3
Image Infornmation: NGC 4236
is a face on barred spiral galaxy with low surface brightness (about 24 mag/arc-secē), located in Draco.
It appears to be a part of the M81 local group of galaxies, although some references put it just outside
of the M81 group. In either case, it is about 11.7 million light years distant. Because of it's low surface
brightness (and I suspect its relatively amorphous blue color) there appear to be few images of this galaxy on amateur
websites. Being a bit closer than M81, yet much less bright, and may be obscurred to some degree.
The exact cause of this discrepancy in brightness is not known.
Additional Comments: The image was assembled in an LLRGB format as a result of its relatively low surface brighness. The
initial LRGB image was assembled in CCDStack. The LRGB image was layered into a Luminescent image in PS CS/3 (color
layer option). Further data stretching, high pass filtering and background smoothing was performed with Adobe Photoshop