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Tuesday, December 27, 2016

Bright nebulae of the central Cygnus

I had about six hours of clear sky at night between 23.- 24.12. That was just enough to shoot this relatively bright emission area in constellation Cygnus.

Bright nebulae of Cygnus
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The photo is in mapped colors from the light emitted by an ionized elements, 
red=sulfur, green=hydrogen and blue=oxygen.

An experimental starless view
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The actual nebula stands out well in this starless version

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This new image was partly overlapping with my older image from Spring season 2016.
Older image. with technical details, can be found HERE 

Nebulae in visual colors
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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.

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An older wide field photo with  the Canon EF 200mm f1.8 camera lens 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, 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
Canon EF 200mm f1.8 camera optics (For S-II and O-III channels)
10-micron 1000
Meade LX200 GPS 12" (For S-II and O-III channels)

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x2 and SXV-AOL
QHY9 (For S-II and O-III channels)

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

Exposure times
H-alpha, 9 x 1200 s binned 2x2 
O-III, 4 x 1200 s binned 4x4 = 
S-II,  4 x 1200 s binned 4x4 

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