Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent Nebula  ·  Crescent nebula  ·  NGC 6888  ·  NGC6888  ·  Sh2-105
Getting plate-solving status, please wait...
Crescent Nebula with Hubble Palette and RGB stars, 



    
        

            KuriousGeorge
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Crescent Nebula with Hubble Palette and RGB stars

Getting plate-solving status, please wait...
Crescent Nebula with Hubble Palette and RGB stars, 



    
        

            KuriousGeorge
Powered byPixInsight

Crescent Nebula with Hubble Palette and RGB stars

Imaging telescopes or lenses: Planewave CDK24

Imaging cameras: FLI Proline 16803

Mounts: Planewave L600

Guiding cameras: Starlight Xpress Ultrastar

Focal reducers: None

Software: Planewave PWI3  ·  Planewave PWI4  ·  PixInsight 1.8  ·  Sequence Generator Pro  ·  Photoshop CS3  ·  PHD Guiding 2  ·  CCDWare CCD Inspector  ·  Maxim DL6

Filters: Chroma 50 mm 5nm SII  ·  Astrodon 50 mm 5 nm Ha  ·  Astrodon 50mm B  ·  Astrodon 50mm R  ·  Astrodon 50 mm 5 nm OIII  ·  Astrodon 50 mm G

Accessory: FLI CFW-5-7  ·  Astrodon Monster MOAG  ·  Hedrick Focuser  ·  Planewave Delta-T  ·  Planewave EFA


Dates:June 21, 2020June 22, 2020

Frames:
Astrodon 50 mm 5 nm Ha: 4x900" (1h) -30C bin 1x1
Astrodon 50 mm 5 nm OIII: 8x900" (2h) -30C bin 1x1
Chroma 50 mm 5nm SII: 5x900" (1h 15') -30C bin 1x1
Astrodon 50 mm G: 4x900" (1h) -30C bin 1x1
Astrodon 50mm B: 4x900" (1h) -30C bin 1x1
Astrodon 50mm R: 4x900" (1h) -30C bin 1x1

Integration: 7h 15'

Darks: ~20

Flats: ~120

Flat darks: ~120

Bias: ~20

Avg. Moon age: 0.72 days

Avg. Moon phase: 0.87%

Mean SQM: 21.70

Mean FWHM: 2.00


Astrometry.net job: 3624209

RA center: 20h 12' 5"

DEC center: +38° 21' 1"

Pixel scale: 0.468 arcsec/pixel

Orientation: 1.266 degrees

Field radius: 0.368 degrees


Resolution: 4028x3976

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard

Description

My goal with this project was to reproduce the Crescent Nebula using a Hubble Palette with the seamless introduction of RGB stars having accurate (PI PCC) color calibration.

Using an RGB lighten layer over the Hubble palette helped preserve the star color well. Mask erasure was used on the brighter stars to help preserve their true color.

Bright stars in the nebula area are a bit more difficult to preserve. And they looked a little strange when I tried. So those are Ha-SII-OIII stars with some magenta removal, but not too much to distract from the "Hubble look".

Our June 21.7 SQM skies really helped get good color with just a few subs. (-:

I left the Hubble midrange green but turned it more towards yellow in the brighter areas for arguably a more natural look.

Other than that, Photoshop Selective Color is your best friend for final tweaks. (-:

I may try gathering more OIII for a deeper lower-noise revision. (-:

Comments

Revisions

  • Crescent Nebula with Hubble Palette and RGB stars, 



    
        

            KuriousGeorge
    Original
  • Final
    Crescent Nebula with Hubble Palette and RGB stars, 



    
        

            KuriousGeorge
    C

C

Description: 1 pixel dust removal for OIII specs resulting from pushing OIII a bit too hard. Needs more OIII. (-:

Uploaded: ...

Sky plot

Sky plot

Histogram

Crescent Nebula with Hubble Palette and RGB stars, 



    
        

            KuriousGeorge