The Cygnus Loop – the colorful remnants of a violent death.
A few thousand years ago, a dying massive star went supernova. As the expanding blast wave from this colossal explosion smashes into clouds of interstellar gas, the excited atoms of hydrogen (red) and oxygen (blue) emit light.
Here is a more natural looking version.
Equipment
- Samyang 135mm f/2
- QHY163M
- Baader narrowband filters
- Sky-Watcher Star Adventurer
- QHY5L-II-C and QHY 30mm guidescope
Acquisition (Total : 30.9h)
- Location : Backyard, bortle 5
- Ha : 12.8h
- OIII : 18.1h
- Calibration : darks, flats
Processing (PixInsight)
Linear (Ha and OIII)
- Drizzle x2
-
Crop
-
DBE
-
Deconvolution (tutorial)
-
Noise reduction (TGV and MMT)
-
Stretch (HT)
Colors (tutorial)
- Factor f : (Ha*OIII)^~(Ha*OIII)
- R : Ha
- G : f*Ha + ~f*OIII
- B : OIII
Luminance
-
L : mean(max(OIII, Ha), mean(OIII, Ha))
-
Sharpening (MLT)
-
HDRMT
-
LHE
-
Curves
LRGB
- Combine (LRGBCombination)
- Curves
- LHE
- Star reduction (tutorial)
Taken in May – June 2020