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The Pillars of Creation, 





    
        

            Andrew Klinger

The Pillars of Creation

Technical card

Resolution: 480x480

Dates:May 12, 2018Aug. 2, 2018

Frames:
Astrodon Ha 5nm: 160x300" (gain: 200.00) -10C bin 1x1
Astrodon OIII 3nm: 37x600" (gain: 200.00) -10C bin 1x1
Astrodon SII 3nm: 36x600" (gain: 200.00) -10C bin 1x1

Integration: 25.5 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 23.13 days

Avg. Moon phase: 41.92%

Bortle Dark-Sky Scale: 4.33

Astrometry.net job: 2315347

Locations: Atoka dark site, Atoka, Oklahoma, United States; Backyard, Flower Mound, Texas, United States

Data source: Backyard

Description

This image is made from the same data as my previous image (M16 imaged in SHO). It was a fun little experiment to see how much usable resolution I could squeeze out of my little 80mm refractor imaging at 382mm fl.

One of the most iconic Hubble images is the "Pillars of Creation". This region in the core of the Eagle Nebula shows dark pillars of dust where newborn stars have been formed within. While I can't pull off the resolution and details of Hubble, it is very exciting to "tribute" the iconic image from data collected in my backyard.

Equipment:
OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)
Mount: Orion Sirius EQ-G (HEQ-5)
Guidescope: Orion 50mm guidescope
Guiding camera: Orion StarShoot Autoguider
Imaging camera: ZWO ASI1600MM-Cool

Accessories:
DeepSkyDad Autofocuser
QHYCCD PoleMaster

Software:
SGP
PHD2
CdC
PixInsight

Acquisition:
Location: Flower Mound, TX for Ha(Bortle 7), Atoka, OK and Ft. Griffin State Historic Park, TX for Oiii and Sii(Bortle 3)
Dates: 5/12/18, 5/26/18, 5/27/18, 6/29/18, 6/30/18, 8/2/18, 8/3/18, 8/6/18
Gain: 200 Offset: 50
Camera temp: -10C
Sii: 36x600" Astrodon 3nm
Ha: 160x300" Astrodon 5nm
Oiii: 37x600" Astrodon 3nm
Total integration time: 25hr 30min
64x darks per calibration (master from library)
30x flats per calibration
200x bias per calibration (master from library)

Preprocessing:
Batch PreProcessing script to generate calibrated images
StarAlignment
LocalNormalization
ImageIntegration
DrizzleIntegration
DynamicCrop each master
DBE each master

Luminance Processing:
Duplicated the master Ha to use as the luminance
Deconvolution
HistogramTransformation bring to non-linear
MultiscaleLinearTransform for sharpening

Preparing separate Sii, Ha, and Oiii linear masters for tonemapping (applied to each master individually):
TGV & MMT noise reduction (via Jon Rista's method)
Removed stars via a StarMask and a few iterations of MMT and MT
Further removed background artifacts with an unmasked MMT
HistogramTransformation to bring to non-linear

Combined prepared Sii, Ha, and Oiii masters with ChannelCombination:
R: Sii
G: Ha
B: Oiii

Tonemap Processing:
Invert>SCNR green>Invert to remove magenta
Several a/b channel CurvesTransformations using ColorMasks to alter the colors to an aesthetically pleasing palette
CurvesTransformation for saturation

Combined Tonemap with Luminance using LRGBCombination
UnsharpMask with a StarMask to harden up the soft stars a tad
CurvesTransformation for slight saturation

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
6290
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Histogram

The Pillars of Creation, 





    
        

            Andrew Klinger

In these public groups

Narrowband imaging