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vdB 152, 


            Andrew Klinger
vdB 152

vdB 152

Technical card

Resolution: 4211x2976

Dates:Oct. 16, 2017

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 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


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).

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


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

Batch PreProcessing script to generate calibrated images
StarAlignment to register all frames to the reference
LocalNormalization of all registered frames (per channel)
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)
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:
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



Andrew Klinger
License: None (All rights reserved)

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vdB 152, 


            Andrew Klinger