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Wednesday, January 4, 2017

The Sky on Fire, Mosaic of the central Cygnus

A three panel mosaic in visual palette, combined from narrowband channels, shows a three degrees patch of the central Cygnus gas formations. I have published a mapped color version few days ago, it can be seen HERE.

The Sky on Fire
Please, click for a large image, ~2200 x 1030 pixels

Image is in Natural colour palette from the emission of ionized elements, R=Hydrogen + Sulphur, G=Oxygen and B=Oxygen + 10% Hydrogen to compensate the missing H-beta emission..

Orientation in Cygnus
Please, click for a full size photo

Area of interest is marked as a white rectangle.
An older wide field photo with  the Canon EF 200mm f1.8 camera lens and Baader narrowband filters. Area of interest is marked as a white rectangle. 

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, 5 nm H-alpha
Baader filter, 8,5 nm O-III
Baader filter, 8 nm S-II

Exposure times for all seven panels
H-alpha, 21 x 1200 s binned 2x2 
O-III, 18 x 1200 s binned 4x4
S-II,  18 x 1200 s binned 4x4

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