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Contains:  IC 444, IC 443, The star μGem, The star Propus (ηGem), Part of the constellation Gemini (Gem)
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The Jellyfish Nebula (IC443) imaged in Hydrogen-alpha, 





    
        

            Andrew Klinger
The Jellyfish Nebula (IC443) imaged in Hydrogen-alpha

The Jellyfish Nebula (IC443) 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:Cartes du CielPHD2EQMODPixInsightSequence Generator Pro

Filter:Astrodon Ha 5nm

Accessory:PoleMaster

Resolution: 4503x3397

Dates:Dec. 20, 2017

Frames:Astrodon Ha 5nm: 283x300" (gain: 200.00) -20C bin 1x1

Integration: 23.6 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 1.97 days

Avg. Moon phase: 4.33%

Bortle Dark-Sky Scale: 7.00

Astrometry.net job: 2053002

RA center: 94.853 degrees

DEC center: 22.850 degrees

Pixel scale: 2.022 arcsec/pixel

Orientation: 0.449 degrees

Field radius: 1.584 degrees

Locations: Backyard, Flower Mound, Texas, United States

Data source: Unknown

Description

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

Software:
SGP
PHD2
CdC
PixInsight

Acquisition:
Location: Flower Mound, TX (Bortle 7)
Dates: 12/9/17, 12/10/17, 12/11/17, 12/20/17
Gain: 200 Offset: 50
Camera temp: -20C
Ha: 283x300" Astrodon 5nm
Total integration time: 23hr 35min
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 (Linear Fit rejection)
DrizzleIntegration
DynamicCrop
DBE

Processing:
Deconvolution
TGV & MMT noise reduction (via Jon Rista's method)
HistogramTransformation x2
Duplicated the image to create a starless version, using a starmask and several iterations of MMT and MT. Then pushed the faint nebulosity in the starless version using PixelMath expression: "1-(1-$T)*(1-$T)"
Combined the starless version with the image using PixelMath expression "F=0.2; (1-(1-$T)*(1-s)*F)+($T*~F)" (s=starless photo).
LocalHistogramEqualization
MLT for sharpening
MMT for slight noise reduction
HistogramTransformation to move black point in
CurvesTransformation for contrast
MorphologicalTransformation for slight star reduction
ACDNR for slight noise reduction
Resampled to 50% for web posting

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
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The Jellyfish Nebula (IC443) imaged in Hydrogen-alpha, 





    
        

            Andrew Klinger