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Contains:  NGC 6995, Veil nebula, Network nebula, NGC 6992, IC 1340
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The Eastern Veil and Pickering's Triangle (NGC6992) imaged in Hydrogen-alpha, 





    
        

            Andrew Klinger
The Eastern Veil and Pickering's Triangle (NGC6992) imaged in Hydrogen-alpha

The Eastern Veil and Pickering's Triangle (NGC6992) 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: 3595x2707

Dates:June 27, 2018

Frames:Astrodon Ha 5nm: 104x300" (gain: 200.00) -10C bin 1x1

Integration: 8.7 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 14.12 days

Avg. Moon phase: 99.53%

Bortle Dark-Sky Scale: 7.00

Astrometry.net job: 2164482

RA center: 313.076 degrees

DEC center: 31.299 degrees

Pixel scale: 2.523 arcsec/pixel

Orientation: 11.655 degrees

Field radius: 1.577 degrees

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)
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: 6/27/18, 6/28/18
Gain: 200 Offset: 50
Camera temp: -10C
Ha: 104x300" Astrodon 5nm
Total integration time: 8hr 40min
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).
HistogramTransformation to move black point in
LocalHistogramEqualization
MultiscaleLinearTransform for sharpening
CurvesTransformation for contrast
MorphologicalTransformation for slight star reduction
ACDNR for slight noise reduction
Resampled to 40% for web posting

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
1390
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The Eastern Veil and Pickering's Triangle (NGC6992) imaged in Hydrogen-alpha, 





    
        

            Andrew Klinger