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Tuesday, January 2, 2018

Sharpless 119 in Cygnus in visual colors

This mosaic image shows the Sharpless 119 (Sh2-119) in a visual spectrum. My previous post about the same target shows it in mapped colors.

Sharpless 119 as a mosaic image of six panels
You really should 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.

Sharpless 119 as a two frame mosaic
Please, click for a full size photo

Published at December 13, 2017, more info HERE

The first frame I shot for the mosaic image
Please, click for a full size photo

Published at November 8, 2017, more info HERE


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) This target is not very commonly photographed due to a close proximity of brighter and well known targets, like North America and Pelican Nebulae.

A wider field image of the area with the 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  my new mosaic photo. Sh2-119 spans about three degrees of sky horizontally. (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 winter season 2012.

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, 60x 1200s, binned 2x2 = 20h
O-III and S-II channels are borrowed form my older wide field photos.

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