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





    
        

            Andrew Klinger
The Elephant's Trunk Nebula (IC1369) imaged in Hydrogen-alpha

The Elephant's Trunk Nebula (IC1369) imaged in Hydrogen-alpha

Technical card

Imaging telescope or lens:William Optics GT-81

Imaging camera:ZWO ASI1600MM-Cool

Mount:Orion Sirius EQ-G (HEQ5)

Guiding telescope or lens:Orion 50 mm Guide Scope

Guiding camera:Orion Star Shoot Auto Guider

Focal reducer:William Optics Flat 6A

Software:Sequence Generator ProPHD2Cartes du CielEQMODPixInsight

Filter:Ha 5nm

Accessory:PoleMaster

Resolution: 3372x4512

Dates:July 17, 2019

Frames:Ha 5nm: 396x180" (gain: 200.00) -10C bin 1x1

Integration: 19.8 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 15.32 days

Avg. Moon phase: 99.65%

Bortle Dark-Sky Scale: 7.00

Astrometry.net job: 2822394

RA center: 21h 39' 31"

DEC center: +57° 59' 24"

Pixel scale: 2.021 arcsec/pixel

Orientation: 269.732 degrees

Field radius: 1.582

Locations: Backyard, Flower Mound, Texas, United States

Data source: Backyard

Description

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
Gain: 200 Offset: 50
Camera temp: -10C
Ha: 396x180" Astrodon 5nm
Total integration time: 19hr 48min
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

Ha Processing:
Deconvolution
TGVDenoise (via Jon Rista's method)
ArcsinhStretch x2
HistogramTransformation
Duplicated image and created a starless image using Starnet++
Pushed nebulosity in starless image with PixelMath function "1-(1-$T)*(1-$T)"
Combined the starless version with the image using PixelMath expression "F=0.4; (1-(1-$T)*(1-s)*F)+($T*~F)" where s=starless image.
MultiscaleLinearTransform for sharpening
MorphologicalTransformation for star size reduction
UnsharpMask on the stars to harden them up a tad
Resampled to 50% for web posting

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
1645
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The Elephant's Trunk Nebula (IC1369) imaged in Hydrogen-alpha, 





    
        

            Andrew Klinger

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