Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Cocoon nebula  ·  IC 5146
IC5146 Cocoon, 



    
        

            skyimages
IC5146 Cocoon
Powered byPixInsight
IC5146 Cocoon, 



    
        

            skyimages
IC5146 Cocoon
Powered byPixInsight

Equipment

Imaging Telescopes Or Lenses
Teleskop-Service ONTC 12" f/5.3
Imaging Cameras
Atik 383L+ mono
Mounts
Losmandy G11
Filters
H-alpha 12nm · Baader LRGB 2'' Filters
Accessories
ASA 2" x0,73 Corrector/Reducer
Software
DC-3 Dreams ACP · Fitswork · Larry Weber FocusMax · Theli · DC-3 Dreams ACP Scheduler
Guiding Telescopes Or Lenses
Teleskop-Service ONTC 12" f/5.3
Guiding Cameras
Lodestar

Acquisition details

Dates:
Aug. 21, 2012 ·  Aug. 27, 2012
Frames:
Baader LRGB 2'' Filters: 53x400" (5h 53' 20") -15°C bin 1x1
H-alpha 12nm: 6x600" (1h) -15°C bin 1x1
Integration:
6h 53' 20"
Avg. Moon age:
7.29 days
Avg. Moon phase:
49.23%

Basic astrometry details

Astrometry.net job: 99280

RA center: 21h53m26s.9

DEC center: +47°1622

Pixel scale: 1.205 arcsec/pixel

Orientation: -134.994 degrees

Field radius: 0.335 degrees

Resolution: 1600x1200

Locations: Heimsternwarte, Markgrafneusiedl, Austria

Description

Some processing details

THELI: after data reduction, weighting, outlier rejecection and stacking the Ha and R channel were combined to a new HaR channel according to their bandwidths, whereas the Ha channel was boosted 1.8x. The three resulting HaR, G and B channels were B-V color calibrated and an enhanced noise weighted luminance channel (elum_chisquare) was built from Ha+R+G+B.

Image "A"

Fitswork: The HaR and B channel were multiplied with the factors given from the earlier B-V calibration (G is always 1 and needs not to be touched). Then the RGB combination from HaR, G and B was done. A gentle NLP noise reduction filter was applied to the resulting color image. The elum_chisquare was afterwards used to generate the L+RGB. Finally the object was streched and cropped.

Image "B"

PixInsight: All channels have been histogram transformed, lrgb combined, background neutralized and color calibrated. To smooth the weak regions an ACNR process was applied and finally a HDRMedianTransform was done. Last step was again streching and cropping.

UPDATE 2012/09/11

Added 1 hour each to the green and blue channel

Comments

Revisions

  • IC5146 Cocoon, 



    
        

            skyimages
    Original
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    D
  • Final
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    E

Sky plot

Sky plot

Histogram

IC5146 Cocoon, 



    
        

            skyimages