Ha: 20.12.2021, 19:53 - 22:25 UT
OIII: 20.12.2021, 17:10 - 19:44 UT
SII: 20./21.12.2021, 22:33 - 00:43 UT
ZWO ASI 1600 MM Pro @ -20°C (Gain=139, Offset=21)
+ C14 & Starizona Hyperstar @ 675 mm (f/1.9)
+ Baader 2" Ha, OIII, SII filter
on CGE-Pro mount
Cable managment to mitigate diffraction spikes:
https://www.flickr.com/gp/daniel_koehn/z61GdHAutoguiding:
Artesky 70 mm Guidscope (f=400 mm)
ZWO ASI 120 MM mini
PhD2 (Multistarguiding)
Dither
light frames:
63 x 120 s (Ha)
63 x 120 s (OIII)
48 x 120 s (SII)
dark frames:
30 x 120 s per channel
acquired with N.I.N.A.
Post-Processing:
PixInsight
Processing based on the excellent HSHO tutorial
https://youtu.be/UzL_UwcqkfI by
@cuivlazygeekHa, OIII, SII channel:
Image calibration (dark + bias frames only), star alignment, image integration, dynamic crop, dynamic background extraction according to this video
https://youtu.be/eB0J4-O5WUQ by
@visibledark_astro, Darkarchons EZ Processing Suite: EZ Softstretch
First HSHO combination via LRGBCombination with 75% weight on the green channel, remove magenta tints in the color image by image inversion and SCNR, star extraction using Starnet, delete first HSHO combination result
Star removal from non-linear Ha, OIII, SII images, second HSHO combination via LRGBCombination of starless HSO images, remove magenta tints in the color image by image inversion and SCNR
Starless HSHO processing:
curves transformation for contrast enhancement, create luminance mask, contrast/color saturation/hue, b, a, c, R, G, B, enhancement of nebula by curves transformations
Sharpening of L:
enhanced luminance sharpening using this video
https://youtu.be/uzwVTZUYNZw by
@visibledark_astroTopaz Denoise AI:
Remove noise from starless image:
Low Light Mode On
Sharpen: 0
Remove Noise: 15
Finally, add stars to starless image using Pixelmath
Location (Bortle 4): Schwentinental, Germany
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