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Wednesday, December 13, 2017

Sharpless 119 in Cygnus, visual spectrum version

Since beginning of September we have had three clear nights. This Autumn season has been the worst in twenty years.

I made a visual color version out of my two frame mosaics of Sharpless 119 (Sh2-119). You can find a mapped color version from HERE. My aim is to make a six panel mosaic of the whole area of the Sharpless 119. At the moment it's not possible due to weather up here.

Sharpless 119 as a two frame mosaic
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 mapped color version can be seen HERE.

An experimental starless version
Please, click for a full size photo

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


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)

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
Please, click for a full size image

Area of the two frame mossaic is marked as a white rectangle. More info about this photo HERE

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

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, 30x 1200s, binned 2x2 = 10h
O-III and S-II channels are borrowed form my older wide field photos.

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