Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Getting plate-solving status, please wait...
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 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


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 .



Edward Overstreet
License: None (All rights reserved)

Sky plot

Sky plot


Caldwell 9 - Cave Nebula, 


            Edward Overstreet

In these public groups

Narrowband imaging