M 20  -  Trifid Nebula

80%  resolution (4.5MB)

Object identification (4.5MB)

DSLR widefield image

Object data of Messier20

Object type: Emission and reflection nebula
Size: 28'
Magnitude: 6.3 mag
Constellation: Sgr
Distance: 5,200 Ly
Notes: 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.

Exposure data

Date: 2017-07-19 + 2017-07-20 + 2017-07-22
Location: ATHOS Centro Astronomico / La Palma (900m)
Telescope: Astro-Physics 175mm f/8 Starfire EDF with field flattener (f=1452mm)
Camera: Moravian G4-16000 with Baader filters
Binning: L 1x1 / RGB 1x1
Mount: 10micron GM3000 HPS
Exposure time: L 18x6min / R 7x6min / G 7x6min / B 7x6min
Exposure time total: 3h 54min

Image acquisition by CEDIC team (Bernhard Hubl, Christoph Kaltseis, Markus Blauensteiner, Michael Hanl)

Image processing by Bernhard Hubl