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Contains:  IC 1396, The star Garnet Star (μCep)
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The Elephant's Trunk Nebula (IC1369) imaged in SHO, 





    
        

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

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

Technical card

Resolution: 2007x2695

Dates:July 17, 2019Aug. 10, 2019

Frames:
Ha 5nm: 396x180" (gain: 200.00) -10C bin 1x1
Astrodon OIII 3nm: 51x600" (gain: 200.00) -10C bin 1x1
Astrodon SII 3nm: 49x600" (gain: 200.00) -10C bin 1x1

Integration: 36.5 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 12.73 days

Avg. Moon phase: 88.61%

Bortle Dark-Sky Scale: 7.00

Astrometry.net job: 2860460

RA center: 324.896 degrees

DEC center: 57.979 degrees

Pixel scale: 3.369 arcsec/pixel

Orientation: 269.732 degrees

Field radius: 1.572 degrees

Locations: Backyard, Flower Mound, Texas, United States

Data source: Backyard

Description

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

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
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The Elephant's Trunk Nebula (IC1369) imaged in SHO, 





    
        

            Andrew Klinger

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Narrowband imaging