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Sunday, November 1, 2020

A supernova remnant in Cygnus, G65.3+5.7 SNR

 This is a rarely imaged target, 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 10h was needed to have this image. The imaging system is very fast since it's undersampled and that's good when I want capture a very large, dim and diffused targets like this one. My current imaging system,

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. This is a very difficult target it has a very low surface brightness and the starfield is extremely dense in this part of the Milky Way.

NOTE, the "noise" in the photos is not a noise at all, it's glow from countless stars,
it can be seen best in full size photo!

G65.3+5.7 SNR
Please, click for a large image, it's worth it!

There are very few images out of this dim and diffused supernova remnant around. Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen. 
Note! An apparent size of the Moon in a same scale can be seen at lower left corner.

A closeup
click for a large image

This is a full resolution close up from the photo to show, how dense the star field really is!

O-III light alone
click for a large image

H-alpha and S-II light Only
click for a large image

Orientation in Cygnus
click for a large image

This super nova remnant can be seen at bottom of the image above. It's partly overlapping with my large mosaic image of Cygnus nebula complex. I have some plans to shoot more frames to the mosaic to it to fully cover both supernova remnants visible in image. 

Technical details

Processing workflow

Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Tokina AT-x f2.8 camera lens

10-micron 1000

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200

Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III

Total exposure time

H-alpha, 12 x 1200 s, binned 1x1 = 4 h
O-III, 12 x 1200 s, binned 1x1 = 4 h
S-II, 6 x 1200 s, binned 2x2 = 2 h

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