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Caldwell 9 - Cave Nebula, 





    
        

            Edward Overstreet
Caldwell 9 - Cave Nebula

Caldwell 9 - Cave Nebula

Technical card

Resolution: 4448x3344

Dates:Nov. 1, 2018

Frames:astronomic Ha 6nm, OIII 6nm, SII 6nm: 210x180" (gain: 200.00) -20C bin 1x1

Integration: 10.5 hours

Darks: ~30

Flats: ~90

Bias: ~100

Avg. Moon age: 23.01 days

Avg. Moon phase: 40.89%

Bortle Dark-Sky Scale: 5.00

Temperature: 13.00

Astrometry.net job: 2356313

RA center: 344.196 degrees

DEC center: 62.625 degrees

Pixel scale: 2.320 arcsec/pixel

Orientation: 353.352 degrees

Field radius: 1.793 degrees

Data source: Backyard

Description

Normally I use PixInsight for most if not all of the heavy lifting. With this capture, I saved as non linear Ha, Oiii, and Sii - as16 bit Tiff files. When in PixInsight - I used DBE, DYN Crop, Histogram Transformation.

In Photoshop I layers the SII over the OIII, over the Ha Channel. I created a Hue Saturation adjustment layer for the SII first - colorized this channel RED and oversaturated while adjusting the luminosity to -40, I then created a clipping mask and set the blending mode to "Screen." I did the exact same thing for the OIII (mapped to BLUE) and the Ha (mapped to GREEN) but since the Ha had so much data......I lowered the luminosity to -60.

I then had some fun tweaking the Hue/Saturation/Luminosity on the three channels - I also added curves adjustment layers for further edits .

Comments

Author

Nikonshooter
Edward Overstreet
License: None (All rights reserved)
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Caldwell 9 - Cave Nebula, 





    
        

            Edward Overstreet

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Narrowband imaging