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Contains:  M 21, NGC 6531, Trifid nebula, M 20, NGC 6514
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M20 - M21 - DSLR, 


            Thomas Richter
M20 - M21 - DSLR

M20 - M21 - DSLR

Technical card

Imaging telescope or lens:GSO 8" f/5 Newton

Imaging camera:Canon EOS 450Da

Mount:SkyWatcher NEQ6 Pro Goto

Guiding telescope or lens:Viewfinder 8x50

Guiding camera:Astrolumina Alccd5L-IIc

Focal reducer:TS Coma corrector 2"

Software:PHD2 GuidingDSS, Fitswork, Gimp

Resolution: 3657x2504

Dates:July 6, 2015

Frames: 30x180"

Integration: 1.5 hours

Avg. Moon age: 19.59 days

Avg. Moon phase: 75.89% job: 1792635

RA center: 270.781 degrees

DEC center: -22.814 degrees

Pixel scale: 1.179 arcsec/pixel

Orientation: 15.024 degrees

Field radius: 0.726 degrees

Locations: Weißenbrunn/Altdorf, Altdorf, Bayern, Germany


Object description (

The Trifid Nebula (catalogued as Messier 20 or M20 and as NGC 6514) is an H II region located in Sagittarius. It was discovered by Charles Messier on June 5, 1764. Its name means 'divided into three lobes'. The object is an unusual combination of an open cluster of stars; 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 that cause the trifurcated appearance; these are also designated Barnard 85). Viewed through a small telescope, the Trifid Nebula is a bright and peculiar object, and is thus a perennial favorite of amateur astronomers.

The Trifid Nebula is a star-forming region in the Scutum spiral arm of the Milky Way. The most massive star that has formed in this region is HD 164492A, an O7.5III star with a mass more than 20 times the mass of the Sun.[6] This star is surrounded by a cluster of approximately 3100 young stars.



Thomas Richter
License: None (All rights reserved)

Sky plot

Sky plot


M20 - M21 - DSLR, 


            Thomas Richter