Hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  Checkmark Nebula  ·  Lobster Nebula  ·  M 17  ·  NGC 6618  ·  Swan Nebula  ·  omega Nebula
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The Swan M17, 



    
        

            Wes Smith
The Swan M17
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The Swan M17

Getting plate-solving status, please wait...
The Swan M17, 



    
        

            Wes Smith
The Swan M17
Powered byPixInsight

The Swan M17

Technical card

Imaging telescopes or lenses: SDM Pimped Obsession 20" Dob ZAMAR

Imaging cameras: Olympus E-PEN2 Mirrorless DSLR

Mounts: Obsession ServoCat/Argo Navis

Software: GIMP 2.10.12  ·  Deep Sky Stacker

Filters: Astonomik UHC


Dates:Aug. 1, 2019

Frames:Astonomik UHC: 245x3" (12' 15") ISO3600

Integration: 12' 15"

Avg. Moon age: 0.44 days

Avg. Moon phase: 0.21%

Bortle Dark-Sky Scale: 1.00


Basic astrometry details

Astrometry.net job: 3589844

RA center: 18h 20' 46"

DEC center: -16° 9' 57"

Pixel scale: 0.717 arcsec/pixel

Orientation: 215.277 degrees

Field radius: 0.243 degrees


Resolution: 1464x1957

Locations: Cambroon Observatory, Cambroon, QLD, Australia

Data source: Traveller

Description

Historical.
"The Swan has always been one of my (many) Favourites but here's my dilemma. I used a UHC filter thinking that it would enhance the Nebulosity ( which the physics says it does) however the old problem of the colour balance skew appears.Here are 2 options that I have post-processed in Gimp (probably different work flows) . At this point in time I think the mono version is the best 245 lights . I also used the 'Best percentage " in DSS which used 188 lights instead of total of 245 which reduced star bloom .. I suspect I need to get some unfiltered RGB data to add???? All shot at 3.2 Sec at ISO3200."
09/06/2020 Post Edit. Now with new editing tools such as Star Tools /Photoshop the colour inballance could be easily fixed.

Comments

Revisions

  • The Swan M17, 



    
        

            Wes Smith
    Original
  • Final
    The Swan M17, 



    
        

            Wes Smith
    B

B

Description: At this point in time I think the mono version is the best 245 lights . I also used the 'Best percentage " in DSS which used 188 lights instead of total of 245 which reduced star bloom . Post edit. In Bortle 1 skies I'd try with no filter next time and blend in the UHC data. Also with Star tools using Stars for white balance one should be able to introduce accurate Colour :)

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The Swan M17, 



    
        

            Wes Smith