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Contains:  NGC 2252, NGC 2244, Rosette nebula, NGC 2239, The star 12Mon
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The Rosette Nebula (NGC2237) imaged in Hydrogen-alpha, 





    
        

            Andrew Klinger
The Rosette Nebula (NGC2237) imaged in Hydrogen-alpha

The Rosette Nebula (NGC2237) 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: 2747x2066

Dates:Jan. 6, 2020

Frames:Ha 5nm: 168x300" (gain: 200.00) -20C bin 1x1

Integration: 14.0 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 10.39 days

Avg. Moon phase: 79.89%

Bortle Dark-Sky Scale: 7.00

Astrometry.net job: 3174280

RA center: 6h 32' 37"

DEC center: +5° 18' 32"

Pixel scale: 3.372 arcsec/pixel

Orientation: 274.314 degrees

Field radius: 1.610

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: 1/6/20, 1/7/20
Gain: 200 Offset: 50
Camera temp: -20C
Ha: 168x300" Astrodon 5nm 1.25"
Total integration time: 14hr
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
ArcsinhStretch x3
HistogramTransformation
Duplicated image and created a starless image using Starnet++
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. Followed by the same function but with F=0.2
HistogramTransformation
LocalHistogramEqualization x2 (once for small scale and again for large scale)
MultiscaleLinearTransform for sharpening
CurvesTransformation slight contrast
MorphologicalTransformation for star size reduction
UnsharpMask on the stars to harden them up a tad
Resampled to 30% for web posting

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
1413
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The Rosette Nebula (NGC2237) imaged in Hydrogen-alpha, 





    
        

            Andrew Klinger

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