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Messier 20 in Sagittarius

Astrophotography from Ursa Major Observatory @ ROSA

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Emission and reflection nebula
28’
+ 6.3
Sgr
2017-07-23 + 24
Astro-Physics 175mm f/8 Starfire EDF with field flattener (f=1452mm)
10micron GM3000 HPS
L 10x6 min, RGB 4x6 min each
2h 12min
Camera:
Moravian G4-16000 with Baader filters
Image acquisition by CEDIC team (Bernhard Hubl, Christoph Kaltseis, Markus Blauensteiner, Michael Hanl) Image processing by Bernhard Hubl
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The Trifid Nebula (catalogued as Messier 20) is a prominent H II region located in constellation Sagittarius. Its name means 'divided into three lobes'. The object is an unusual combination of an open star cluster, an emission nebula (the lower, red portion), a reflection nebula (the upper, blue portion) and a dark nebula (the apparent 'gaps' within the emission nebula). Besides M20, the above image shows also the bright open star cluster M21, the faint emission nebula Sh 2-26 and the small open star cluster Bochum 14.
5 200 Ly