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Contains:  NGC 281
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NGC 281 in HOO, 


            Glenn Diekmann
NGC 281 in HOO

NGC 281 in HOO

Technical card

Resolution: 4568x3428

Dates:Dec. 12, 2018

Astrodon H-alpha 5 nm: 30x240" (gain: 139.00) -10C bin 1x1
Astrodon OIII 3 nm: 11x240" (gain: 139.00) -10C bin 1x1

Integration: 2.7 hours

Darks: ~50

Flats: ~16

Flat darks: ~50

Bias: ~200

Avg. Moon age: 4.73 days

Avg. Moon phase: 23.25%

Bortle Dark-Sky Scale: 7.00 job: 2442698

RA center: 13.167 degrees

DEC center: 56.674 degrees

Pixel scale: 1.098 arcsec/pixel

Orientation: 358.931 degrees

Field radius: 0.871 degrees

Data source: Backyard


This is my first image with narrowband filters. I do not yet have an SII filter, so this one is Ha and OIII only. I was surprised by how much noise was in the OIII channel. Suppressing the noise and obtaining somewhat natural star colors were the most challenging aspects of this project.



Glenn Diekmann
License: None (All rights reserved)

Sky plot

Sky plot


NGC 281 in HOO, 


            Glenn Diekmann