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Contains:  Crescent nebula, NGC 6888
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Crescent Nebula - 2-channel narrowband, 





    
        

            TomBramwell
Crescent Nebula - 2-channel narrowband

Crescent Nebula - 2-channel narrowband

Technical card

Resolution: 3326x2504

Dates:Aug. 11, 2018

Frames:
Astrodon 3nm Ha filter: 14x600" -20C bin 1x1
Astrodon 3nm OIII filter: 14x600" -20C bin 1x1

Integration: 4.7 hours

Darks: ~40

Flats: ~30

Bias: ~40

Avg. Moon age: 0.10 days

Avg. Moon phase: 0.01%

Bortle Dark-Sky Scale: 1.00

Astrometry.net job: 2318943

RA center: 303.082 degrees

DEC center: 38.325 degrees

Pixel scale: 0.554 arcsec/pixel

Orientation: 5.202 degrees

Field radius: 0.320 degrees

Locations: Chews Ridge, Los Padres National Forest, CA, United States

Data source: Traveller

Description

The Crescent Nebula (NGC 6888) is a beautiful emission nebula located in the constellation Cygnus nearly 5000 light years from Earth. This image was shot at just over 5000 feet elevation atop Chews Ridge in the Los Padres National Forest on 8/11/18 in new moon conditions. Favorable onshore winds allowed my friends and I to enjoy some rare clear air in the middle of all of these fires. This was the first time pointing my telescope at this nebula, and my first evening in the wild for my focal reducer+Moonlite+Sesto Senso - everything worked like a dream! Being able to lock my mirror to avoid mirror flop and automate my focus was a huge win for me. This is probably some of the best data I’ve ever shot, and I did so off the grid at my longest and most challenging focal length. What an amazing experience.

Hardware roll call:
Celestron EdgeHD 1100 w/ .7x reducer
QSI 683wsg-8 CCD
Astrodon 3nm Ha/OIII
Avalon Instruments M-Uno Fast Reverse
Primalucelab Eagle 2 Pro
Moonlite Litecrawler + Sesto Senso

Integration/Calibration
14 x 600sec Ha
14 x 600sec OIII
30 ea flats
40 ea darks
40 ea bias

R - 100% Ha
G - 40% Ha / 60% OIII
B - 100% OIII

Comments

Author

TomBramwell
TomBramwell
License: None (All rights reserved)
2370
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Revisions

  • Crescent Nebula - 2-channel narrowband, 





    
        

            TomBramwell
    Original
  • Final
    Crescent Nebula - 2-channel narrowband, 





    
        

            TomBramwell
    B

Sky plot

Sky plot

Histogram

Crescent Nebula - 2-channel narrowband, 





    
        

            TomBramwell