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IC434 and Barnard 33 (horsehead) Ha-RGB, 





    
        

            pfile

IC434 and Barnard 33 (horsehead) Ha-RGB

Technical card

Imaging telescope or lens:RCOS 24" f/8 RC

Imaging camera:Apogee Alta U42

Software:PixInsight

Filters:Astrodon Filter: BlueRedAstronomik Ha 12nm CCDAstrodon G

Resolution: 2029x2029

Dates:Nov. 19, 2009

Frames:
Astrodon G: 6x240" -30C bin 2x2
Astrodon Filter: Blue: 8x240" -30C bin 2x2
Astrodon H-alpha 5nm: 8x420" -30C bin 1x1
Red: 4x240" -30C bin 2x2

Integration: 2.1 hours

Avg. Moon age: 2.56 days

Avg. Moon phase: 7.22%

Bortle Dark-Sky Scale: 2.00

Astrometry.net job: 107442

Locations: Rodeo, None; rodeo new mexico, None

Description

Horsehead Nebula (IC434) in Orion. captured using LB-0001 (lightbuckets.com 24" f/8 R-C telescope). camera is the Apogee Alta U42: 2Kx2K pixels.

11/19/2009-11/23/2009 in Rodeo, New Mexico, USA.

Filters: L(RGB) = Ha(R:G:B)
Exposure: 3360s(960s,1080s,1440s) = 8x420s(4x240s,6x240s,8x240s)
CCD Binning: L = 1x1 bin; RGB = 2x2 bin

L and R, G, B stacks using deepskystacker.
L and R, G, B histogram stretches using pixinsight core 1.5
L: curve and a trous wavelets for sharpening.
RGB merge, histogram stretch/align and curves in pixinsight
L-RGB registration and LRGB merge in pixinsight (L=0.63,R=0.82,G=0.88,B=0.88)
lots and lots of cleanup in photoshop CS - to fix internal reflections and ccd bleed.
final tweaks and color balance in lightroom 2

comments: color subexposures were way too long, resulting in a ridiculous amount of star halo and ccd bleed on the 3 largest stars. this took a lot of work in photoshop to undo, and it's still obvious that there was a big problem there. this was especially bad in the blue channel, hence the purple cast around the big stars.

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IC434 and Barnard 33 (horsehead) Ha-RGB, 





    
        

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