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Contains:  Hourglass nebula, Lagoon nebula, M 20, M 8, NGC 6514, NGC 6523, NGC 6526, NGC 6530, NGC 6544, NGC 6546, The star 7Sgr, The star 9Sgr, Trifid nebula
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M8 & M20 - The Lagoon and Trifid Nebulae (Ha-RGB), 


            Olivier Ravayrol
M8 & M20 - The Lagoon and Trifid Nebulae (Ha-RGB)
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M8 & M20 - The Lagoon and Trifid Nebulae (Ha-RGB)

Technical card

Dates:Aug. 19, 2015Aug. 21, 2017Aug. 15, 2018

Astronomik CCD CLS Canon EOS Clip: 11x240" ISO800 bin 1x1
Astronomik CCD Ha 12nm Canon EOS Clip: 24x360" ISO800 bin 1x1

Integration: 3.1 hours

Darks: ~3

Flats: ~18

Bias: ~100

Avg. Moon age: 12.73 days

Avg. Moon phase: 14.06%

Bortle Dark-Sky Scale: 5.00

Basic astrometry details job: 3250398

RA center: 18h 4' 18"

DEC center: -23° 58' 15"

Pixel scale: 2.256 arcsec/pixel

Orientation: 268.925 degrees

Field radius: 1.561 degrees

Resolution: 4218x2647

Locations: Observatoire personnel, Tournefeuille, Haute-Garonne, France

Data source: Own remote observatory


Luminance with Ha filter narrow band 12nm + G&B colors layers
2h24mn Ha & 44mn RGB total exposure time at 800 iso (Tournefeuille, France)
600/80 mm Refractor – 450D EOS filter removed - Ha & CLS filters
Preprocessing with IRIS (Christian Buil software)
Image processing with Photoshop
Final touch with Lightroom



Olivier Ravayrol
License: None (All rights reserved)

Sky plot

Sky plot


M8 & M20 - The Lagoon and Trifid Nebulae (Ha-RGB), 


            Olivier Ravayrol