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Contains:  IC 1590, IC1590, NGC 281, NGC281, Sh2-184
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NGC 281, 


            Gary Lopez
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Technical card

Dates:Aug. 31, 2019Sept. 1, 2019Sept. 2, 2019Sept. 3, 2019Sept. 5, 2019Sept. 10, 2019

Astrodon Ha 3nm-31mm: 227x180" (gain: 200.00) -15C bin 1x1
Astrodon OIII 3nm-31mm: 59x180" (gain: 200.00) -15C bin 1x1
Astrodon SII 3nm-31mm: 66x180" (gain: 200.00) -15C bin 1x1

Integration: 17.6 hours

Darks: ~30

Bias: ~50

Avg. Moon age: 5.01 days

Avg. Moon phase: 29.30%

Bortle Dark-Sky Scale: 4.00 job: 3433552

RA center: 0h 52' 53"

DEC center: +56° 34' 6"

Pixel scale: 0.312 arcsec/pixel

Orientation: -109.706 degrees

Field radius: 0.384 degrees

Resolution: 5001x7309

Locations: Monterey Pines Observatory, Monterey, California, United States

Data source: Backyard


In the constellation Cassiopeia is a bright emission nebula, NGC 281, commonly called “Pacman Nebula.” In the center of the nebula is a star cluster, IC 5090, whose young, hot stars are generating intense solar winds that are sculpting channels and pockets in the surrounding gas and dust. Along the perimeter are a collection of Bok globules, as well as a large dust cloud that forms a dark slash into the cloud.

Collecting the data for this image was frustrating. While I was fortunate to have a string a clear nights, the quality of the sky made for very uneven HFR values, ranging from 1.8 to 4.8 within the course of six hour sessions. In total I captured nearly 30 hours of data, but employed only about the best 17 hours for this image, data with of HFR 2.8 or less. I created a master luminance with Ha, OIII, and SII data whose HFR was 2.3 or less.



Gary Lopez
License: None (All rights reserved)

Sky plot

Sky plot


NGC 281, 


            Gary Lopez