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Thursday, January 23, 2014

A supernova remnant in Cygnus (Not a Veil nebula) reprocessed

I found six hours of unused H-a data, for this SNR, from my hard drive! Now the dim background emission of an ionized hydrogen is in balance with O-III emission of supernova remnant. The overall look and feel of the image is much natural, I think.

This is a rarely imaged target. I haven't been able to find an other color image of it, showing the whole supernova remnant. This is also one of the most difficult targets, I have ever shot. Due to a very dense star field, large angular dimension and a very diffused structure this is even more difficult target, than a Simeis 147 supernova remnant in Taurus. Total exposure time of 38h was needed to have this image.

G65.3+5.7 SNR has about the same angular dimensions, than brighter and more famous remnant in Cygnus, the Veil Nebula The angular dimensions are about 3x4 degrees.
NOTE, this image is updated at 20.01.2014. There is now a better H-a channel and the background is practically full of ionized Hydrogen, H-alpha.

G65.3+5.7 SNR, reprocessed with extra H-a data
A supernova remnant in constellation Cygnus

A bicolor image of the supernova remnant. An ionized Hydrogen emission (H-alpha) can be seen as Red and an ionized Oxygen emission (O-III) as Blue. Buy a photographic print from HERE

A detail image of G65.3+5.7 SNR
So many stars...

A closeup from the full resolution image, click to see it at maximum size.


Technical details

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 33% weight
Levels, curves and color combine in PS CS3.

Optics, Canon EF 200mm camera lens at f1.8
Camera, QHY9
Guiding, Meade LX200 GPS 12" and a Lodestar guider
Image Scale, ~5 arcseconds/pixel
H-alpha, 69x1200s = 23h
O-III, 45x1200s = 15h
Total exposure time 32h

A single calibrated and stretched 20min O-III frame
O-III is the stronger channel!

Heavily stretched 1200s frame of the strongest channel, ionized Oxygen (O-III), doesn't show much.

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