Contains: Cocoon nebula, IC 5146
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Technical card

Resolution: 1600x1200

Dates: Aug. 21, 2012Aug. 27, 2012

H-alpha 12nm: 6x600" -15C bin 1x1
Baader LRGB 2'' Filters: 53x400" -15C bin 1x1

Integration: 6.9 hours

Avg. Moon age: 7.29 days

Avg. Moon phase: 49.23% job: 99280

RA center: 328.362 degrees

DEC center: 47.273 degrees

Pixel scale: 1.205 arcsec/pixel

Orientation: -134.994 degrees

Field radius: 0.335 degrees

Locations: Heimsternwarte, Markgrafneusiedl, Austria


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





Sky plot

Sky plot


IC5146 Cocoon,