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Contains:  IC 4996, Crescent nebula, NGC 6888, The star 34Cyg
Getting plate-solving status, please wait...
NGC6888 Crescent nebula, 


            Hugues Obolonsky
NGC6888 Crescent nebula

NGC6888 Crescent nebula

Technical card

Resolution: 4871x3204

Dates:July 12, 2018Aug. 15, 2018

STC Dual Narrow Band: 60x180" (gain: 200.00) -10C bin 1x1
Astronomik UV-IR block L2: 192x180" -10C bin 1x1

Integration: 12.6 hours

Darks: ~61

Flats: ~17

Bias: ~255

Avg. Moon age: 16.69 days

Avg. Moon phase: 11.24%

Temperature: 14.00 job: 2222922

RA center: 303.223 degrees

DEC center: 38.011 degrees

Pixel scale: 1.854 arcsec/pixel

Orientation: 13.682 degrees

Field radius: 1.502 degrees

Locations: Plouezec, Plouezec, Cotes d'armor, France; Mas de Montaigu, Montaigu de Quercy, Tarn-et-Garonne, France

Data source: Backyard


Crescent nebula with a one shot color camera is a real challenge.

Beside the lack of HA, you end up with an image with "an excessive number" of stars.
So it took time to process the data, and i'm not sure i did the right thing to control all of thoses moskitoes in the final image :)

I will appreciate your comments on this more than 10 hours shot.

On the 2 last versions, i add 3 hours of the data from the STC dual narrowband filter.

Now, with good eyes you can spot the Planetary Nebula (NP G75.5 1.7) discover in 2010 by Dave Jurasevich alias the soap bubble ;)



Hugues Obolonsky
License: None (All rights reserved)


  • NGC6888 Crescent nebula, 


            Hugues Obolonsky
  • NGC6888 Crescent nebula, 


            Hugues Obolonsky
  • Final
    NGC6888 Crescent nebula, 


            Hugues Obolonsky


Add some H Alpha, OIII with a dual narrowband filter.


A better Hα / OIII balance.

Sky plot

Sky plot


NGC6888 Crescent nebula, 


            Hugues Obolonsky

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