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 Custom FLR)
Filters: Astrodon Ha, NII, OIII (3 nm filters)
Mount: Software Bisque Paramount ME
Acquisition Programs: The Sky,CCDAutopliot III, CCD Soft.
Processing Programs: CCDStack, Maxim DL, Photoshop
Date: Data processed June 2011. Data aquisition: September
22, 2010- November 6,
Time: 16 x30 min ( 8
hours) each for each of Ha, SII, NII and OIII:
Total of 32 hours imaging time.
Processing: CCD Stack and PhotoShop CS/3
Image Infornmation: NGC 7822 ia an emission nebula in
the constelation of Cepheus. The glowing star forming region which "lights" this nebula is about 3,000 light
years away. This object has relatively different patterns under NII and H-alpha filters, with a large central blue (OIII)
component with less, but significant, contribution in the SII region.
Comments: This Narrow Band image was obtained using AstroDon
3nm band pass of Ha, NII and OIII. This object sheds light in the Ha, SII, NII and OIII wavelengths.
The Narrow Band image was created by an unequal weighting of SII-Ha-OIII at a ratio of 6:1:14. This was essentially
a modified Hubble Palette (RGB as Ha/NII/OIII). This was layered over a modified (enhanced) N-II image to snmooth
out the noise and bring out some of the details lost in the assembled narrow band image. Further data stretching,
high pass filtering and background smoothing was performed with Adobe Photoshop CS/4. All data stretching was by minimal
stretching with gamma and DDP in CCD Stack and then further stretching with curves/levels in photoshop.