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Contains:  California nebula, NGC 1499, The star ξPer
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California Nebula (NGC1499) imaged in Hydrogen-alpha, 





    
        

            Andrew Klinger
California Nebula (NGC1499) imaged in Hydrogen-alpha

California Nebula (NGC1499) 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: 4520x3424

Dates:Oct. 1, 2017

Frames:Astrodon Ha 5nm: 101x180" (gain: 200.00) -20C bin 1x1

Integration: 5.0 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 10.46 days

Avg. Moon phase: 80.45%

Bortle Dark-Sky Scale: 7.00

Astrometry.net job: 2052985

RA center: 60.200 degrees

DEC center: 36.366 degrees

Pixel scale: 2.016 arcsec/pixel

Orientation: 3.176 degrees

Field radius: 1.588 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: 10/1/17
Gain: 200 Offset: 50
Camera temp: -20C
Ha: 101x180" Astrodon 5nm
Total integration time: 5hr 3min
64x darks
30x flats
200x bias

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).
HDRMulitiscaleTransform
LocalHistogramEqualization with inverted starmask
UnsharpMask slight sharpening
MorphologicalTransformation slight star reduction
CurvesTransformation slightly increase brightness
DarkStructureEnhance Script
Resample 50% for web posting

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
500
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California Nebula (NGC1499) imaged in Hydrogen-alpha, 





    
        

            Andrew Klinger