Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  IC 1340  ·  NGC 6992  ·  NGC 6995  ·  Network nebula  ·  Veil nebula
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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
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The Eastern Veil and Pickering's Triangle (NGC6992) imaged in Hydrogen-alpha

Getting plate-solving status, please wait...
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
Powered byPixInsight

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

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: Ha 5nm

Accessory: PoleMaster


Dates:June 27, 2018

Frames:Ha 5nm: 104x300" (8h 40') (gain: 200.00) -10C bin 1x1

Integration: 8h 40'

Darks: 64

Flats: 30

Bias: 200

Avg. Moon age: 14.12 days

Avg. Moon phase: 99.53%

Bortle Dark-Sky Scale: 7.00


Basic astrometry details

Astrometry.net job: 2164482

RA center: 20h52m18s.2

DEC center: +31°1756

Pixel scale: 2.523 arcsec/pixel

Orientation: 11.655 degrees

Field radius: 1.577 degrees


Resolution: 3595x2707

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

Sky plot

Sky plot

Histogram

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



    
        

            Andrew Klinger