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vdB 152, 





    
        

            Andrew Klinger
vdB 152

vdB 152

Technical card

Resolution: 4211x2976

Dates:Oct. 16, 2017

Frames:
ZWO B 1.25": 20x300" (gain: 76.00) -20C bin 1x1
ZWO G 1.25": 18x300" (gain: 76.00) -20C bin 1x1
Astrodon Ha 5nm: 390x180" (gain: 200.00) -20C bin 1x1
ZWO L 1.25": 38x300" (gain: 76.00) -20C bin 1x1
ZWO R 1.25": 21x300" (gain: 76.00) -20C bin 1x1

Integration: 27.6 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 26.28 days

Avg. Moon phase: 11.46%

Bortle Dark-Sky Scale: 3.80

Astrometry.net job: 2052991

RA center: 332.627 degrees

DEC center: 70.761 degrees

Pixel scale: 2.018 arcsec/pixel

Orientation: 266.562 degrees

Field radius: 1.445 degrees

Locations: Atoka dark site, Atoka, Oklahoma, United States; Backyard, Flower Mound, Texas, United States

Data source: Unknown

Description

vdB 152 is a faint reflection nebula in the constellation Cepheus. Its dusty trail is part of a much larger molecular cloud complex in the Cepheus region.

Although I collected many hours of Ha data, I blended very little into the final image because of poor SNR (I should've exposed longer for each sub).

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 for Ha(Bortle 7), Atoka, OK for LRGB(Bortle 3)
Dates: 9/4/17, 9/6/17, 9/7/17, 9/11/17, 9/18/17, 10/12/17, 10/16/17
Gain: 200 Offset: 50 for Ha
Gain: 76 Offset: 15 for LRGB
Camera temp: -20C
Ha: 390x180" Astrodon 5nm
L: 38x300"
R: 21x300"
G: 18x300"
B: 20x300"
Total integration time: 27hr 35min (although the data really only represents 8hr 5min because of lightly incorporated Ha data).
64x darks per calibration
30x flats per calibration
200x bias per calibration

Preprocessing:
Batch PreProcessing script to generate calibrated images
StarAlignment to register all frames to the reference
LocalNormalization of all registered frames (per channel)
ImageIntegration
DrizzleIntegration
DynamicCrop each master
DBE applied to L
ABE applied to Ha, R, G, B
Using PixelMath, blended linear Ha with linear masters (30% into Lum, 50% into Red, 10% into Blue)

RGB Processing:
Linear fit to Blue channel
ChannelCombination to create RGB (technically HaRGHaB)
PhotometricColorCalibration
SCNR green (50%)
TGV and MMT noise reduction (via Jon Rista's method)
HistogramTransformation x3
CurvesTransformation for saturation of nebulosity
CurvesTransformation for saturation of stars
HistogramTransformation to bring in black point and slightly stretch

L Processing:
Deconvolution
HistogramTransformation x2
Ended up creating a duplicate starless image just to create a mask consisting of only nebula (I know right)
Used that nebula mask on the original image in conjunction with ExponentialTransformation (S/M/I function) to push dusty areas x2
LocalHistogramTransformation with inverted StarMask

Combined L and RGB using LRGBCombination tool
SCNR green (100%)
Resampled to 50% for web posting

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
700
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vdB 152, 





    
        

            Andrew Klinger