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Contains:  North America nebula, NGC 7000, NGC 6997
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North America Nebula, 


            Don Walters
North America Nebula

North America Nebula

Technical card

Resolution: 3520x4656

Dates:July 21, 2018

Astrodon 3nm Ha: 21x180" (gain: 200.00)
Astrodon 3nm OIII: 21x180" (gain: 200.00)

Integration: 2.1 hours

Darks: ~35

Flats: ~50

Flat darks: ~50

Avg. Moon age: 9.00 days

Avg. Moon phase: 66.90%

Bortle Dark-Sky Scale: 5.00 job: 2166068

RA center: 314.706 degrees

DEC center: 44.089 degrees

Pixel scale: 1.629 arcsec/pixel

Orientation: 355.511 degrees

Field radius: 1.320 degrees

Locations: My Backyard, Benton, AR, United States

Data source: Backyard


This was my first time using an off-axis guider, and I'm glad I did! My guide RMS is now less than half what I was getting with a guide scope. I saw as low as 0.4, but typically got from 0.6-1.0.

I also increased my dithering to 20 pixels, since I had to change it anyway for the OAG.

All calibration, stacking, and processing done in PixInsight:

Calibrated my Flats with Flat-Darks
Calibrated my lights against a master dark and master flats (no bias)
Integrated all calibration frames with Winsoried clipping
Integrated my Ha/OIII/SII masters with linear fit clipping
Drizzle up by 2x
Resample down by 1/2
MLT (noise reduction) to each master
Combined using Pixelmath:
R = Ha
G = 65%*Ha / 35%*OIII
Histogram transformation
Unsharp mask
HDRMT (with star mask)



Don Walters
License: None (All rights reserved)

Sky plot

Sky plot


North America Nebula, 


            Don Walters