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Contains:  M 21, NGC 6531, Trifid nebula, M 20, NGC 6514
Getting plate-solving status, please wait...
M20 Trifid Nebula and M21 Webb's Cross, 


            Sven Hoffmann
M20 Trifid Nebula and M21 Webb's Cross

M20 Trifid Nebula and M21 Webb's Cross

Technical card

Resolution: 4383x3299

Dates:June 5, 2019June 9, 2019June 29, 2019July 1, 2019

B: 106x60" (gain: 76.00) -15C bin 1x1
G: 107x60" (gain: 76.00) -15C bin 1x1
Baader L : 114x60" (gain: 76.00) -15C bin 1x1
R: 107x60" (gain: 76.00) -15C bin 1x1

Integration: 7.2 hours

Darks: ~32

Flats: ~16

Flat darks: ~16

Avg. Moon age: 15.73 days

Avg. Moon phase: 15.66%

Bortle Dark-Sky Scale: 5.00

Mean FWHM: 2.50

Temperature: 20.00 job: 2788228

RA center: 270.745 degrees

DEC center: -22.787 degrees

Pixel scale: 1.411 arcsec/pixel

Orientation: 92.202 degrees

Field radius: 1.075 degrees

Data source: Backyard


Hi guys,

this image was a really hard one for me I have to say. M20 rises only to about 12 degrees maximum where I live which made it really hard to collect all the data for a good image. Nevertheless I kept at it and collect a reasonable amount to edit this image. I tried for about 3 days until I am finally satisfied with it. There are some residual gradients due to the light pollution here and at the low altitude I have to shoot through a lot of it.

I hope you enjoy looking at it as much as I :) I took some special care to making sure you can actually perceive the myriad of stars in the background with all there different colors.



Sven Hoffmann
License: None (All rights reserved)

Sky plot

Sky plot


M20 Trifid Nebula and M21 Webb's Cross, 


            Sven Hoffmann