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 Ha, SII, OIII
Mount: Software Bisque Paramount ME
Acquisition Programs: The Sky,CCDAutopliot III, CCD Soft.
Processing Programs: CCDStack, Maxim DL, Photoshop
Date: July 5-July 24, 2008
Time: 18x20 min ( 6
hours) for each of Ha, SII, OIII
Total of 18 hours imaging time.
Processing: CCD Stack and PhotoShop CS/3
Image Information: The "Eagle Nebula", about 7,000 light years distant, is made up of an open star cluster (technically known
as M16, or NGC 6611) and an emission nebula (IC 4703, ie, "The Eagle Nebula"). These two are popularly known, together, as
the "Eagle Nebula". The nebulosity is a diffuse emission nebula in Serpens Cauda. The Pillars of Creation
are seen on the right and the "Spire" (which is some 9.5 light years tall) to the left. Both are H II regions
responsible for the creation of new stars (about 5 million years old). Young stars emitting ultraviolet light are presumably
eroding both the spire and the pillars.
Processing rocessing Information:
The image was first assembled in CCDStack using two methods. 1) The first was
a Hubble Palette image with nothing selected for the luminance channel. This produced an image with greater color variation
and relative star preservation. The ratios of SII, Ha and SII were adjusted so that the green Ha signal did not overwhelm
the image, leaving it as a pure green image (ratios were: 20:1:36, with the dark nebulosity below the pillars of creation
used for background, as there were no true background areas in my FOV). 2) The second image was produced as noted
above but also contained the Ha data under "Luminance". This brought out the fine Ha detail, some of which was
lost in bringing out the SII and OIII data in the first image (the same ratios were used). This can also be done in
Photoshop alone, and a composite or luminance addition can be used to bring out further standard broad spectrum star and color
Finally the two images were separately processed in Photoshop CS/3 (curves and
levels, shadows/highlights, high pass filtering) and blended in Photoshop CS/3.
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