Imaging telescope or lens: William Optics FLT 110 Triplet APO
Imaging camera: SBIG ST-2000XM
Mount: 10 Micron GM1000 HPS
Guiding camera: 10Micron HPS System
Focal reducer: William Optics 0.8x Field Flattener Type III
Integration: 11.7 hours
Avg. Moon age: 19.18 days
Avg. Moon phase: 79.34%
Bortle Dark-Sky Scale: 7.00
Astrometry.net job: 1202656
RA center: 79.001 degrees
DEC center: 34.429 degrees
Pixel scale: 2.402 arcsec/pixel
Orientation: 179.143 degrees
Field radius: 0.577 degrees
Locations: Castenedolo, Castenedolo, Italy
MAPOW number 7
This image is an unusual Hα - SII bicolor composition in false color.
Hα and SII emisson lines lays both in deep red so it is impossible to render color differences in a real way: the only option is a false color composition.
In this image Hydrogen emission has the usual pinkish color due to the Hα and Hβ emission lines.
As said before the SII emission line lays in deep red, but on Earth the cristalline sulfur has yellow hues so my goal wos to render the SII in yellow.
To accomplish My Goal I've used the PixelMath tool in PixInsigth.
The composition formula was:
R Channel: Hα
G Channel: SII
B Channel: 0.25*Hα - 0.75*SII
The B channel formula is very simple the 0.25*Hα acconts for the Hβ emission giving to the Hydrogen emission the usual pinkish color, subtracting the SII emission shifts the color hue of the Sulfur rich zones toward yellow the 0.75 factor is an arbitrary value chosen to render the wanted color.
All the image processing was done in PixInsight
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