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Wednesday, December 21, 2016

Dark filaments in Cygnus, project finalized

This winter season I have been shooting some well known and relatively bright objects in Cygnus, My purpose was show them little differently by selecting some less imaged details to show.

This time my target was an area in North America Nebula, NGC 7000. There are some interesting looking formations of dark nebulae.

Dark filaments of Cygnus
Please, click for a large image

Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen. Image spans about two degrees of sky.

B&W image
Please, click for a large image

This photo shows the emission of hydrogen alpha (H-a) alone.

Please, click for a large image

Area of interest is marked as a white rectangle.
This wide field photo of the North America and Pelican Nebulae was shot with Canon EF 200 mm f1.8 camera lens, QHY9 astrocam and Baader narrowband filters.

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
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Celestron Edge HD 1100 @ f10 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 for both image panels
H-alpha, 30 x 1200 s = 10 h
S-II,  6 x 1200 s binned 2x2 = 2 h
O-III,  6 x 1200 s binned 2x2 = 2 h
Total 14 h

A single uncropped, calibrated and stretched 20 min. H-alpha frames used for the mosaic image

Left side of the mosaic image

Right side of the mosaic image

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