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Sunday, January 16, 2011

A supernova remnant, the "Veil Nebula" 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.


Veil Nebula
Ra 20h 45m 38.0s Dec +30° 42′ 30″






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.


This very large SN locates in constellation Cygnus, about 2000 light years away. Angular diameter is about three degrees, about six full Moons side by side. Veil Nebula is one of the brightest features in the X-ray sky,
optically it has lowish surface brightness.






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.






An older image from 2007 of Eastern part of the nebula, NGC 6995. Sky Watcher 80 ED with an UHC-s filter and QHY8. Exposure time about 4h.




Original versions from Autumn 2008, with technical details:

I have made an experimental movie about the structure of the nebula. It can be found here:







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