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Wednesday, November 8, 2017

Sharpless 119 (Sh2-119) in Cygnus




This is my second light for the Autumn season 2017. This is a detail of the large emission area just couple of degrees from the North America nebula. It's very overlooked due to its low surface brightness and a close proximity of brighter and more famous emission targets.
I have plans to shoot the whole nebula as a mosaic of six image panels, when ever the weather permits.


Sharpless 119 in Cygnus (Sh2-119)
Please, click for a full size image

Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen. The photo spans about a square degree of sky. (The full Moon spans about 0,5 degrees of sky.)


An experimental starless version

In this starless version the shapes in gas and dust are easier to see.


Image in visual spectrum
Please, click for a full size photo

Image is in Natural color palette from the emission of ionized elements, R=Hydrogen + Sulphur, G=Oxygen and B=Oxygen + 10% Hydrogen to compensate the missing H-beta emission.



A wider field image of the area, Canon 200mm f1.8 lens
Please, click for a full size image

Sharpless 119 can be seen at lower left corner. The white rectangle shows the location of the new photo. It spans about a square degree of sky. (The full Moon spans about 0,5 degrees of sky.)
This photo was taken with the Canon EF 200mm f1.8 lens and the QHY9 astrocam, Baader narrowband filter set at 2012.


An other wide field shot, Tokina AT 300mm f2.8 lens

More info about this photo HERE


INFO

Sh2-119, Sharpless 119, is a large complex of emission nebulosity in Cygnus constellation, about 2 degrees east of the North American Nebula. It is located just around 68 Cygni, a quite bright star of magnitude 5. (The most bright star in the photo)


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 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Celestron Edge HD 1100 @ f10 with 0,7 focal reducer for Edge HD 1100 telescope

Mount
10-micron 1000

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and SXV-AOL

Astrodon filter, 5nm H-alpha

Exposure times

H-alpha, 21x 1200s, binned 2x2 = 7h
O-III and S-II channels are borrowed form my older wide field photos.









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