Crescent Nebula with Hubble Palette and RGB stars ( KuriousGeorge )

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Crescent Nebula with Hubble Palette and RGB stars

Imaging Telescopes Or Lenses: Planewave CDK24
Imaging Cameras: FLI PL16803
Mounts: Planewave L600
Filters: Astrodon 50 mm 5 nm Ha · Chroma 50 mm 5nm SII · Astrodon 50mm B · Astrodon 50mm R · Astrodon 50 mm 5 nm OIII · Astrodon 50 mm G
Accessories: FLI CFW-5-7 · Astrodon Monster MOAG · Planewave EFA · Hedrick Focuser · Planewave Delta-T · None
Software: Diffraction Limited MaxIm DL · Open PHD Guiding Project PHD2 · Planewave PWI4 · PixInsight 1.8 · Sequence Generator Pro · CCDWare CCD Inspector · Photoshop CS3 · Planewave PWI3
Guiding Cameras: Starlight Xpress Ultrastar M

Dates:: June 21, 2020 · June 22, 2020
Frames:: Astrodon 50 mm 5 nm Ha: 4×900″(1h) -30°C bin 1×1
Astrodon 50 mm 5 nm OIII: 8×900″(2h) -30°C bin 1×1
Astrodon 50 mm G: 4×900″(1h) -30°C bin 1×1
Astrodon 50mm B: 4×900″(1h) -30°C bin 1×1
Astrodon 50mm R: 4×900″(1h) -30°C bin 1×1
Chroma 50 mm 5nm SII: 5×900″(1h 15′) -30°C bin 1×1
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

RA center: 20h12m05s.497

DEC center: +38°21′01″.20

Pixel scale: 0.468 arcsec/pixel

Orientation: 1.266 degrees

Field radius: 0.368 degrees

More info:Open

Resolution: 4028x3976

File size: 4.1 MB

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard

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. (-:

Original
Final
C

C

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

Uploaded: ...

Schmidt-Cassegrain Telescope (SCT) Imagers

	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds

	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

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Status	Advanced success
Started	...
Astrometry.net job	3624209
PixInsight job	AWHFE40ANTH9E8BFIY5INR6F4VQBNKLB
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m05s.497
RA (top/left)	20h13m27s.578
RA (top/right)	20h10m46s.933
RA (bottom/right)	20h10m43s.997
RA (bottom/left)	20h13m23s.494

Dec (center)	+38°21′01″.20
Dec (top/left)	+38°36′07″.92
Dec (top/right)	+38°36′49″.54
Dec (bottom/right)	+38°05′50″.76
Dec (bottom/left)	+38°05′10″.55

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Crescent Nebula with Hubble Palette and RGB stars

Crescent Nebula with Hubble Palette and RGB stars

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Crescent Nebula with Hubble Palette and RGB stars

Crescent Nebula with Hubble Palette and RGB stars

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