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Messier 20 - The Trifid Nebula | Astrophotography Tips and Images

Updated: Aug 22, 2023


Messier 20 is a great target for amateur astrophotographers, no matter which instrument you own. A close-up image will show a lot of details, especially in Barnard 85, the dark nebula.

A wide-field shot will allow you to capture both M20 and M8 in the same frame. Both are about the same magnitude and make for an impressive photo together.


Object Designation: M20, Sh2-30, NGC 6514

Also known as: The Trifid Nebula

Constellation: Sagittarius

Object Type: Emission Nebula

Distance: 4,100 light-years away

Magnitude: 6.3

Discovery: Charles Messier on June 5, 1764


Messier 20 is not a common deep-sky object. The Trifid Nebula and the stars that burn in the gases are probably the youngest of our galaxy. Two red and blue areas show the gas surrounding the birth of new burning stars. Check out our latest attempt at this target and discover tips on how to capture this object yourself.

 

M20 & M8 - Bortle 2 Skies Without Filters

July 2023


In preparation of Season 4 of the Galactic Course, we needed to change our telescope at Utah Desert Remote Observatories. We had a Stellarvue SVX130T there originally and swapped it out for a Celestron RASA 8. It was a great change of pace to photograph new objects with the RASA and we enjoyed not having to deal with a filter wheel because it doesn't have any!


We mentioned above that imaging both M20 and M8 together can yield lovely results. Without any filters, the outcome will be in "true color" and we hoped it would bring out some fun Ha details because of the dark skies at the remote observatory. Our thoughts? IT'S BEAUTIFUL!


See Messier 20 with its neighbor Messier 8 below. We have two versions, the left is the finished image, and we also used StarXTerminator to create a starless version (seen on the right).


Click the images to see a high-resolution photo.


GEAR USED:

Camera: ZWO ASI2600MC

Telescope: Celestron RASA 8

Mount: 10Micron GM1000 HPS

Processing: Pixinsight, with R-C Astro plugins


ACQUISITION DETAILS:

Total Exposure Time: 8 hours

Exposure Time per frame: 5 minutes

Filters: N/A

Gain: 100


 

The Trifid Nebula in Narrowband

August 2019


3 years passed since our first attempt, so we decided to revisit this target with a wider telescope and our new CMOS camera. Below is the result with the ASI 1600MM-pro cooled astrophotography camera.


Truth be told, we actually prefer the image we got with our Canon t3i, mostly because the one below lacks a lot of detail in the second blob. Perhaps we should have spent a little more time with the Oxygen III filter? You will also notice that some of the stars are a bit too pink and maybe oversaturated.


Messier 20 with CMOS camera

GEAR USED:

Telescope: Meade 70mm APO

Acquisition: ZWO ASIAIR

Processing: Pixinsight

ACQUISITION DETAILS:

Total Exposure Time: 3 hours

Exposure Time per frame: 3 minutes

Filters: Ha (1 hour) / SII (1 hour) / OIII (1 hour)

Gain: 139


 

First Attempt - Trifid Nebula with a DSLR Camera

August 2016


We first imaged this nebula three years ago, with our Canon t3i. You can see the result below.

Sadly, this unmodified DSLR camera is not great for bringing out the Hydrogen Alpha gases, so the red area doesn't show as much as we were hoping it would. 


To the bottom right, you can see the cluster of stars Messier 21 as well. That's 2 Messier objects in one frame!


Trifid Nebula with DSLR camera

GEAR USED:

Camera: Canon t3i

Telescope: 8" Astrograph

Mount: Atlas EQ-G

Processing: Pixinsight

ACQUISITION DETAILS:

Total Exposure Time: 3 hours

Exposure Time per frame: 3 minutes

60 lights - 21 Darks - 20 Bias

ISO: 400


 

Locating the Trifid Nebula

star chart for locating Triffid Nebula

M20 is located just above the Lagoon Nebula in the Milky Way band. To find it, you can simply follow the same steps as for Messier 8, but this time, head just a bit higher.


Messier 20 is smaller than its neighbor and will be relatively easy to spot with binoculars, but seeing it with the naked eye is more of a guessing game. It will look more like a fuzzy star than a gray patch.

Once again, do not wait until the last minute to capture this nebula, as it does not rise very high.

You may also see Messier 21 through binoculars or a telescope. M21 is a star cluster that is near the Lagoon!


 

Cool Facts about M20

  • Dark nebula in front appears to separate the two blobs

  • Photographed by Hubble in 1997

  • Brightest star is a triple star system


 

Single Shot and Processing of M20


Below you can see our single shots of Messier 20.


The first image (in color) was taken using our unmodified Canon t3i DSLR Camera. It looks really good for just 3 minutes of exposure, and the colors are really popping already!


The three other ones are, in order, 3 minutes with Ha, SII, and OIII filter. M20 can be seen on the top right of each narrowband image. The nebula in the center of the frame is M8, the Lagoon Nebula, which we imaged at the same time.


 

Trifid Nebula M20 astrophotography

Just like M8, M20 doesn’t get very high from the horizon. This can be challenging when photographing it because you want to make sure that there are no big cities in the direction of the nebula, or it will create a light pollution dome that you will have to shoot through.


Make sure to make Barnard 85, the black nebulosity, visib