Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent Nebula  ·  NGC 6888
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NGC 6888, The Crescent Nebula, 



    
        

            Mark Wetzel
NGC 6888, The Crescent Nebula
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NGC 6888, The Crescent Nebula

Getting plate-solving status, please wait...
NGC 6888, The Crescent Nebula, 



    
        

            Mark Wetzel
NGC 6888, The Crescent Nebula
Powered byPixInsight

NGC 6888, The Crescent Nebula

Technical card

Imaging telescopes or lenses: Celestron C9.25 Edge HD

Imaging cameras: ZWO ASI 1600MM-Pro Cool

Mounts: Celestron CGEMⅡ

Guiding telescopes or lenses: Celestron C9.25 Edge HD

Guiding cameras: ZWO 174MM Mini

Software: Pleiades Astrophoto PinInsight  ·  PHD 2

Filters: ZWO 36mm 7nm OIII  ·  ZWO 36mm 7nm Ha  ·  ZWO 36mm 7nm SII  ·  ZWO 36mm Red  ·  ZWO 36mm Green Filter

Accessory: Celestron OAG


Dates:Aug. 12, 2020Aug. 15, 2020Aug. 16, 2020Aug. 23, 2020Aug. 24, 2020

Frames:
ZWO 36mm 7nm Ha: 65x300" (5h 25') (gain: 139.00) -10C bin 1x1
ZWO 36mm 7nm OIII: 71x300" (5h 55') (gain: 139.00) -10C bin 1x1
ZWO 36mm 7nm SII: 53x300" (4h 25') (gain: 139.00) -10C bin 1x1
ZWO 36mm Blue Filter: 59x60" (59') (gain: 139.00) -10C bin 1x1
ZWO 36mm Green Filter: 58x60" (58') (gain: 139.00) -10C bin 1x1
ZWO 36mm Red: 61x60" (1h 1') (gain: 139.00) -10C bin 1x1

Integration: 18h 43'

Darks: ~50

Flats: ~50

Flat darks: ~50

Avg. Moon age: 17.26 days

Avg. Moon phase: 25.50%

Bortle Dark-Sky Scale: 2.00


Basic astrometry details

Astrometry.net job: 3817782

RA center: 20h 12' 11"

DEC center: +38° 20' 24"

Pixel scale: 1.251 arcsec/pixel

Orientation: 18.046 degrees

Field radius: 0.344 degrees


Resolution: 1575x1200

Locations: Coast Range Remote Site, Walton, Oregon, United States

Data source: Traveller

Description

I went to a remote site in the Coast Range of Oregon for four imaging sessions in August to create an image of the Crescent Nebula in the constellation Cygnus.  The first night had unexpectedly excellent seeing and transparency. The second, third and fourth nights were average, so the stars were a bit bloated. The emission nebula was captured with narrowband filters, Hydrogen-alpha (Ha), Oxygen-III (OIII) and Sulfur-II (SII). I also took short exposures with Red, Green and Blue filters to capture the natural color of the stars. This is a false color image that combines Ha and SII in the red channel, Ha and OIII in the green channel and OIII in the blue channel. The RGB star color image was blended with the false color image to produce the final result. This image was challenging to obtain a color balance that highlights the structure in the reds and the faint glow in the green-blue OIII. The stars are not quite right.

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