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

Technical card

Imaging telescopes or lenses: William Optics GT-81

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Orion Sirius EQ-G (HEQ5)

Guiding telescopes or lenses: Orion 50 mm Guide Scope

Guiding cameras: Orion Star Shoot Auto Guider

Focal reducers: William Optics Flat 6A

Software: Sequence Generator Pro  ·  PHD2  ·  Cartes du Ciel  ·  EQMOD  ·  PixInsight

Filters: Astrodon OIII 3nm  ·  Astrodon SII 3nm  ·  Ha 5nm

Accessory: PoleMaster

Dates:July 17, 2019Aug. 10, 2019

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

Basic astrometry details job: 2860460

RA center: 21h 39' 35"

DEC center: +57° 58' 44"

Pixel scale: 3.369 arcsec/pixel

Orientation: 269.732 degrees

Field radius: 1.572 degrees

Resolution: 2007x2695

Locations: Backyard, Flower Mound, Texas, United States

Data source: Backyard


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.

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

DeepSkyDad Autofocuser AF1
QHYCCD PoleMaster


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)

Batch PreProcessing script to generate calibrated images

Luminance Processing:
Duplicated the master Ha to use as the luminance
ArcsinhStretch and HistogramTransformation to bring to non-linear
ExponentialTransformation to push nebulosity
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)
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



Andrew Klinger
License: None (All rights reserved)

Sky plot

Sky plot


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


            Andrew Klinger

In these public groups

Narrowband imaging