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Wednesday, November 30, 2016

A detail photo of the dark filaments in Pelican nebula

I have shot lights for this image back in October 5 but found time to process them just now.
The complex cloud of dust and gas locates in front of the ionized gas clouds. Ionized gas, mainly oxygen in this photo, is emitting light and due to that we are able to see the dark formation,

Dark clouds in Cygnus
Click for a large image

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

An experimental starless version
Please, click for a large image

The actual gas formations stand out well in this starless version.

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 all three panels
H-alpha, 6 x 1200 s = 2 h
S-II,  6 x 1200 s binned 2x2 = 2 h
O-III information is taken from an older the wide field shot seen above, ~2 h 
Total 6 h

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