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Wednesday, January 12, 2011

Sh2-129 reprocessed




Since my processing technique gets better and weather doesn't give any support, I have reprocessed some older images. There is now star colors added and other processing is tweaked too.


Sharpless129, wide field





Image is in HST-palette, (HST=Hubble Space Telescope)

from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
Star colors are mixed from the NB channels, Red=H-a, G=O-III and B= 85%O-III + 15%H-a.

Sh2-129 is a diffused nebula in Cepheus. It locates about four degrees west from IC1396. This nebula has a very low surface brightness and there is very few images of it around, I haven't seen this in HST-palette before.
Image area is about three degrees wide. (Six full Moons side by side)



Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum. 
Star colors are mixed from the NB channels, Red=H-a, G=O-III and B= 85%O-III + 15%H-a.


Original version with technical details:
(Shot with a Canon EF 200mm f1.8 lens, full aperture, and QHY9 astro camera)


An older image shows the relation to IC1396.
HaRGB image mosaic with a Canon FD 200mm f2.8 lens and QHY8-astrocamera.





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