Contains: M 21, NGC 6531, Trifid nebula, M 20, NGC 6514
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M8 "Trifid" & M21 in LRGB-HO (TSA102)

Technical card

Resolution: 2851x3568

Dates: Aug. 12, 2017Aug. 13, 2017Aug. 14, 2017Aug. 15, 2017

Frames:
Astronomik Ha 6nm: 12x300" -10C bin 1x1
Astronomik OIII 6nm: 12x300" -10C bin 2x2
Astronomik B 1.25": 20x180" -10C bin 2x2
Astronomik G 1.25": 20x180" -10C bin 2x2
Astronomik L 1.25": 24x300" -10C bin 1x1
Astronomik R 1.25": 20x180" -10C bin 2x2

Integration: 7.0 hours

Darks: ~64

Flats: ~14

Bias: ~100

Avg. Moon age: 21.04 days

Avg. Moon phase: 61.35%

Bortle Dark-Sky Scale: 2.00

Astrometry.net job: 1814386

RA center: 270.818 degrees

DEC center: -22.763 degrees

Pixel scale: 1.158 arcsec/pixel

Orientation: 4.432 degrees

Field radius: 0.735 degrees

Locations: Cargèse, Cargèse, Corse du Sud, France

Comments

Author

Jean-Baptiste Auroux
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M8 "Trifid" & M21 in LRGB-HO (TSA102), Jean-Baptiste Auroux