Contains: NGC 281
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Pacman Nebula in Ha/SII-OIII/SII-OIII

Technical card

Resolution: 4544x3112

Dates: Sept. 8, 2017Sept. 9, 2017Sept. 10, 2017

ZWO H-alpha 7nm: 55x300" (gain: 150.00)
ZWO OIII: 55x300" (gain: 150.00)
ZWO SII 7nm: 50x300" (gain: 150.00)

Integration: 13.3 hours

Avg. Moon age: 18.10 days

Avg. Moon phase: 87.32% job: 1728377

RA center: 13.154 degrees

DEC center: 56.635 degrees

Pixel scale: 0.905 arcsec/pixel

Orientation: 77.749 degrees

Field radius: 0.692 degrees


80/20 mix of Ha and SII in the red channel, 70/30 mix of OIII and SII in the green channel.



Chris Sullivan



Finally had the bright idea to get the detail I was after by simply adding a layer of hydrogen alpha, setting this to high pass, and moving a copy of the background to the top set as "lighten" to correct for the darkening that the high pass HA caused. I think it worked out great!

Sky plot

Sky plot


Pacman Nebula in Ha/SII-OIII/SII-OIII, Chris Sullivan