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Monday, November 9, 2015

Filaments of Cygnus

There are lots of dim gas filaments at west side of the Cygnus nebula complex. I have spent this Autumn season by shooting them. Due to close proximity of brighter and more eye catching nebulae in Cygnus, this area is not very commonly imaged.

Filaments of Cygnus
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Natural color composition from the emission of ionized elements.

Filaments of Cygnus in HST-mapped colors
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Image in mapped colors from the light emitted by ionized elements. 
Red=Sulfur, Green=Hydrogen and Blue=Oxygen.

An experimental starless version
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The actual nebula is easier to observe in this starless photo

A closeup

Interesting shapes in the nebula, they must be some kind of shock fronts

Orientation in the constellation Cygnus
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The area of interest is marked as a white rectangle in this 18-panels narrow band mosaic of the Cygnus.

Technical details

Processing work flow

Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 21 iterations, added at 25% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Celestron Edge HD 1100 @ f7 with 0,7 focal reducer for Edge HD 1100 telescope

10-micron 1000

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x2 and SXV-AOL

Astrodon filter, 5nm H-alpha
Astrodon filter, 3nm O-III
Astrodon filter, 3nm S-II

Exposure times
H-alpha, 15 x 1200s = 5h.
O-III, 6 x 1200s binned = 2h
S-II,  6 x 1200s binned = 2h
Total 9h

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