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Color
Variations in NGC7000
(Third
of three CCD test images)
Emission
Nebula in Cygnus
Uploaded
9/22/06
This image is another short
exposure set, taken to test out the SV80s with the ST10XME CCD
camera. This is a pure RGB image, with no extra hydrogen alpha
data added. Despite this, the results show some promise, and
even with these unacceptably trailed stars from flexure (when
I tried to use the main instrument as a guider), the results
seem compelling.
Look carefully
at the color variations across the face of the nebula. When maintaining
a precise G2V color balance on nebula, I often see subtle colors
not easily seen otherwise. Here, notice the set of pink areas
just above the "Gulf of Mexico" region, and just above
that one at the top of the frame. Such intricate hues were never
recorded by me with my film shots, even with deep Schmidt Camera
images. Also note the plethora of yellow stars in this image.
This is caused by extensive interstellar dust in this part of
the Galaxy.
I now think
the setup has been more or less wrung out, and is ready for some
deep, dark skies imaging. The next step is to move the refractor
to its own permanent observatory up in the ultra dark, world
class skies at Happy Jack.
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Instrument: Stellarvue SV80s
Platform: Astrophysics 1200 QMD
CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling
Guider: SBIG ST4
Exposure: RGB = 10:10:10
RGB Combine Ratio: 1: 1.05: 1.11
Filters: AstroDon RGB Tricolor
Location: Payson, Arizona
Elevation: 5150 ft.
Sky: Seeing FWHM = 5 arcsec (Maxim DL - 10min subframe), Transparency 9/10
Outside Temperature: 45 F
CCD Temperature: -20 C
Processing Tools: Maxim DL, Gralaks Sigma, Photoshop, PixInsight, Starizona Debloomer.
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