M 20 (Trifid Nebula)

Messier 20 (catalogued also as NGC 6514, called Trifid Nebula) is an H II region in constellation Sagittarius. Its name means 'divided into three lobes'. This is an unusual combination of an open cluster of stars; an emission nebula (the right, red portion), a reflection nebula (the left, blue portion) and a dark nebula (catalogued as Barnard 85 which represents the apparent 'gaps' within the emission nebula that cause the trifid appearance).


Technical Details:

Optics: 12" ASA Astrograph at F/6.8
Mount: ASA DDM 85
Camera: SBIG STL-11000M
Filters: Astronomik RGB filters
Dates/Times: 24 and 25 July 2011
Location: Rozhen
Exposure Details: R = 90 min., G = 90 min., B = 90 min.
Subexposures: 10 minutes
Acquisition: CCD Soft
Processing: PixInsight, Photoshop CS

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