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Contains:  Crescent nebula, NGC 6888
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NGC 6888 - The Crescent Nebula

Technical card

Imaging telescope or lens:Stellarvue SV4

Imaging camera:ZWO ASI1600MM-Cool

Mount:Astro-Physics Mach1 GTO

Guiding telescope or lens:Stellarvue SV4

Guiding camera:QHY5L-II-M

Focal reducer:Astro-Tech AT2FF Field Flattener

Software:Sequence Generator ProPSPixInsightPHD2

Filters:Astrodon Ha 1.25 5nmAstrodon OIII 1.25 3nm

Resolution: 4640x3503

Dates:July 8, 2018July 11, 2018

Astrodon Ha 1.25 5nm: 217x180" (gain: 200.00) -15C bin 1x1
Astrodon OIII 1.25 3nm: 213x180" (gain: 200.00) -15C bin 1x1

Integration: 21.5 hours

Avg. Moon age: 25.98 days

Avg. Moon phase: 15.80%

Bortle Dark-Sky Scale: 7.00 job: 2164678

RA center: 303.043 degrees

DEC center: 38.326 degrees

Pixel scale: 1.107 arcsec/pixel

Orientation: 0.132 degrees

Field radius: 0.894 degrees

Locations: Home, San Jose, California, United States

Data source: Backyard


The Crescent Nebula and the fainter Soap Bubble Nebula in bicolor captured from the backyard.

This target was actually a bit tricky to process. The outer OIII shell is iconic and should be brought out. However, I noticed it reduces the contrast of the more interesting HA structures underneath quite a bit. Thus, I chose to bring out the OIII shell just enough so that we can see it is there and still preserving enough contrast to show off the HA regions. Still not sure if this is a good decision since it is my first time capturing and processing this object.



Alan Pham

Sky plot

Sky plot


NGC 6888 - The Crescent Nebula, 


            Alan Pham