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Thursday, October 6, 2011

Sharpless 119, Sh2-119

Sharpless 119
In constellation Cygnus, Ra 21h 18m Dec +44 00'

HST-palette, (HST=Hubble Space Telescope) from the emission of ionized elements,
R=Sulfur, G=Hydrogen and B=Oxygen.

Sharpless 119 is a largish emission nebula in constellation Cygnus. There are not too many images of it around due the close proximity of eye catchers, North America and Pelican Nebulae. Sh2-199 locates just three degrees East from the NGC 7000, North America Nebula. A bright magnitude 5 star 68 Cygni, can be seen at very center of the image above. There are several dark globules at the Southern part of the nebula. 
This image covers about three degrees of sky, that's six full Moons side by side. There are some interesting looking structures in the nebula, straight line type of gas formations, they can be seen at Five and Six a clock positions, starting from image center to almost the edge of the image above.

Image is in Natural color palette from the emission of ionized elements, 
R=Hydrogen + Sulfur, G=Oxygen and B=Oxygen + Hydrogen.
(Looks much like a "wide screen version" of the Rosette Nebula.)

A 100% crop from above image. Not a bad sharpness for a 300mm Tokina AT-X camera lens, full open at f2.8.  I have had some orthogonality problems between the optics and the CCD-shell. Now it has been fixed and all the stars are pinpoint from edge to edge.

An experimental starless image to show the actual nebula better.

Technical details:

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

Optics, Tokina AT-X 300mm camera lens at f2.8
Camera, QHY9 Guiding, SXV-AO @ 6,5Hz
Image Scale, 3,5 arcseconds/pixel
Exposures H-alpha 10x1200s, binned 1x1O-III 3x1200s, binned 3x3
S-II 3x1200s, binned 2x2
Total exposure time ~5h

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