Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  B85, M 20, M 21, M20, M21, NGC 6514, NGC 6531, Sh2-28, Sh2-30, Trifid nebula
Getting plate-solving status, please wait...
M20 Trifid Nebula and M21 Webb's Cross, 


            Sven Hoffmann
Powered byPixInsight

M20 Trifid Nebula and M21 Webb's Cross

Technical card

Imaging telescopes or lenses: SkyWatcher Esprit 100ED Super APO Triplet

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: SkyWatcher AZ-EQ5 GT

Guiding telescopes or lenses: SkyWatcher Esprit 100ED Super APO Triplet

Guiding cameras: QHYCCD QHY5L-IIm

Software: Pleaides Astrophoto PixInsight 1.8 Ripley  ·  Sequence Generator Pro  ·  Astro Pixel Processor

Filters: Baader L  ·  B  ·  G  ·  R

Accessory: ZWO OAG  ·  ZWO EFW 8x 1.25"  ·  Skywatcher Field Flattener for Esprit 100  ·  Lacerta Motorfokus

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: 18h 2' 58"

DEC center: -22° 47' 13"

Pixel scale: 1.412 arcsec/pixel

Orientation: -92.164 degrees

Field radius: 1.075 degrees

Resolution: 4383x3299

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