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Thursday, November 10, 2011

Cirrus of Cygnus, start of the new project

A Hydrogen alpha filtered monochrome image of thin, cirrus like, filaments from an edge of large emission area in constellation Cygnus.

I have started a new imaging project. This time I will shoot a three panel panoramic mosaic  since I like to show a whole network of thin filaments at edge of Cygnus emission nebula. This image spans about 12 degrees horizontally... that's 24 full Moons side by side. I will shoot all three emission channels for this, when ever my local weather let me do so...
The "Propeller Nebula" can be seen at bottom center Left. HERE is an image of it from this Autumn and colors of it will give a hint, how this new image going to look when ready.

An experimental starless version

 Same image with suppressed stars to show the actual nebula complex better.
It's funny to see, how much more details can be seen in nebula by this way, even though stars in original image are absolute pinpoints.

A starless closeup reveals some details

Very odd looking loops in filaments...  One at lower Left looks like a lasso.

Real Cirrus clouds to compare

Technical details:

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Levels, curves and color combine in PS CS3.

Optics, Canon EF 200mm camera lens at f1.8
Camera, QHY9
Guiding, Meade LX200 GPS 12" and a Lodestar guider
Image Scale, ~5 arcseconds/pixel
Filter, Baader 7nm H-alpha
Exposures for three panels, from Left to Right
Panel 1, 8x900s Binned 1x1
Panel 2, 4x900s Binned 1x1
Panel 3, 5x 900s Binned 1x1

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