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The Elephant's Trunk Nebula (IC1369) imaged in SHO

astrophotography
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#1 KBALLZZ

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Posted 14 August 2019 - 04:19 PM

48538966587_6445e9f85c_c.jpg

 

The Elephant's Trunk Nebula (IC1369) imaged in SHO by Andrew Klinger, on Flickr

(Link to astrobin in sig)

 

 

IC1396 is a massive emission nebula in the constellation Cepheus. This nebula is so large I couldn't even fit the entire structure within my frame, yet you could easily fit 5 full moons across this image from our perspective. Within this nebula are tendrils of dark dust and most noticeably the "Elephant's Trunk" sprawling out near the bottom of the image. Ionized Sulfur, Hydrogen, and Oxygen molecules within the nebula were mapped respectively to Red, Green, and Blue to create this false-color image.

 

Equipment: 
OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)
74mm aperture stop-down ring (brings scope to f/5.2)
Mount: Orion Sirius EQ-G (HEQ-5)
Guidescope: Orion 50mm guidescope
Guiding camera: Orion StarShoot Autoguider
Imaging camera: ZWO ASI1600MM-Cool

 

Accessories:
DeepSkyDad Autofocuser AF1
QHYCCD PoleMaster

 

Software: 
SGP
PHD2
CdC
PixInsight

 

Acquisition: 
Location: Flower Mound, TX (Bortle 7)
Dates: 7/17/19, 7/18/19, 7/19/19, 7/20/19, 8/10/19, 8/11/19, 8/12/19
Gain: 200 Offset: 50
Camera temp: -10C
Ha: 396x180" Astrodon 5nm
SII: 49x600" Astrodon 3nm
OIII: 51x600" Astrodon 3nm
Total integration time: 36hr 28min
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
DBE

 

Luminance Processing:
Duplicated the master Ha to use as the luminance
Deconvolution
ArcsinhStretch and HistogramTransformation to bring to non-linear
ExponentialTransformation to push nebulosity
LocalHistogramEqualization
MultiscaleLinearTransform for sharpening
HistogramTransformation

 

Preparing separate Sii, Ha, and Oiii linear masters for tonemapping (applied to each master individually):
TGV & MMT noise reduction (via Jon Rista's method)
ArcsinhStretch and HistogramTransformation to bring to non-linear
Removed stars via StarNet++
Further removed background artifacts with MMT
DBE on the SII and OIII channel to help corners
LinearFit to Ha

 

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

 

Tonemap Processing:
HistogramTransformation to balance channels
Several a/b channel CurvesTransformations using ColorMasks to alter the colors to an aesthetically pleasing palette
MMT to heavily noise reduce any artifacts
CurvesTransformations to fix the over saturation near the bright stars.

Combined Tonemap with Luminance using LRGBCombination:
CurvesTransformation for contrast
MorphologicalTransformation for slight star reduction
UnsharpMask with a StarMask to harden up the soft stars a tad
HistogramTransformation to pull the white point in a little
CurvesTransformation with a red ColorMask to help reduce reds in the corners
Resampled to 30% for web posting


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#2 alvarete

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Posted 14 August 2019 - 05:00 PM

Impresive.
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#3 ciraxis

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Posted 14 August 2019 - 05:16 PM

Wow, those color transitions are fantastic!


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#4 lucam

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Posted 14 August 2019 - 05:42 PM

Awesome image, Andrew!


Sent from my iPhone using Tapatalk
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#5 elmiko

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Posted 14 August 2019 - 06:41 PM

Great job Andrew! Thanks for sharing the details of the processing. Really is a beautiful image!

Mike


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#6 astrovienna

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Posted 14 August 2019 - 10:13 PM

Excellent result.  Proves you can get great images without having to spend a fortune.

 

Kevin


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#7 44maurer

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Posted 15 August 2019 - 12:51 AM

Very nice, love the color.


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#8 Der_Pit

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Posted 15 August 2019 - 06:50 AM

Wow, that's really amazing.

This is a center cutout, yes?  


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#9 KBALLZZ

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Posted 15 August 2019 - 10:52 AM

Thanks everyone!

Wow, that's really amazing.

This is a center cutout, yes?  

By center cutout do you mean crop? If so then, no, this is the entire frame of my setup.



#10 Der_Pit

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Posted 15 August 2019 - 11:25 AM

Thanks everyone!

By center cutout do you mean crop? If so then, no, this is the entire frame of my setup.

Yuck.  I really thought I had a larger FOV (at 450mm) in some test shot I had done last year.  Just checked, digging it out from the disk.  Of course it isn't.  That's how your memory betrays you blush.gif


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