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Tuesday, January 26, 2016

Filaments of Cygnus in visual spectrum

This is a visual color version of my first picture for the year 2016. I published the Mapped Color version at January 7. This is a two frame mosaic project of the central Cygnus. It was shot at freezing temperature of - 27 degrees centigrade (-17 fahrenheit). Exposures are from three nights between 3. - 6. january 2016. Total exposure time 15h.

Filaments of Cygnus
click for a full size image

Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.

Orientation in Cygnus 

Area of interest is marked as a white regtangle in this older wide field image of the area.
More info about this photo can be found HERE.

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, 27 x 1200s =9h
O-III, 9 x 1200s binned = 3h
S-II,  9 x 1200s binned = 3h
Total 15h

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