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A Weird False color Flaming Star Nebula

Technical card

Resolution: 1449x945

Dates: Oct. 31, 2015Nov. 1, 2015

Frames:
Baader Planetarium Ha 7nm: 31x600" -25C bin 1x1
Baader Planetarium SII 8nm: 26x900" -25C bin 1x1

Integration: 11.7 hours

Darks: ~50

Flats: ~20

Bias: ~50

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

Description

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

Comments

Author

Edoardo Luca Radi...
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A Weird False color Flaming Star Nebula, Edoardo Luca Radice (Astroedo)

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Imagers of Italy
Narrowband imaging