I applied the Dynamic and GHS tricks here and was surprised at the outcome. Since I had some questions last time I did this, I uploaded the NB starless images to give and idea of what is behind the composition.
Steps:
1. Destar and denoise each NB image.
2. Apply GHS.
3. Stretch each NB image to fill the histogram (B,C and D).
4. Apply the "Universal" Dynamic Combo Script.
5. A few cosmetic changes and adding back the NB stars in an understated manner.
Discussion of GHS aspects of processing:
GHS Forum DiscussionIf you are interested, this is the combination recipe:
Dynamic ComboFrom GalaxyMap:Sh 2-117 is composed of the North American and Pelican nebulae, NGC 7000/IC 5070/IC 5067, which are visible through gaps in the Rift system of dusty giant molecular clouds that separates the Gould Belt from the Cygnus X complex.
Sh 2-117 appears to be ionised by the O5V star
2MASS J20555125+4352246. This star is heavily obscured by the dust in the Lynds dark nebula
LDN 935, a Rift cloud which lies at a distance of about 520 parsecs in front of Sh 2-117, and appears to divide the North American and Pelican nebulae.
The radio source
W80 appears in this direction. A 2009 paper concludes that W80 is generated only partly by Sh 2-117 and includes emission from 4 distinct sources located at different distances along the line of sight.
GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>There are 313 Sh2 objects. All now imaged.
This is my collection:
Sharpless2Wide-Angle Hydrogen Alpha Nikon Image Sh2 79-171Please note there is also a Sharpless2 Group with now more than 2700 examples.
Sharpless2 GroupOther useful links include:
Gary Imm's CollectionGalaxyMap's CollectionThe Sharpless CatalogThe MDW H-alpha Sky SurveyReiner Vogel's detailed observing catalogHope you enjoy these obscure but interesting objects...
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