M20 Trifid Nebula

Posted: May 1st, 2026

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NGC

IC

HD

Technical Info

Telescope/Lens: Planewave CDK24

Camera: QHY 600M

Mount: PlaneWave L-600 Direct Drive

Software: Siril, GraXpert, Lightroom, StarNet++

Exposure:

3 x 300" ISO/Gain: 0 - R

6 x 300" ISO/Gain: 0 - G

3 x 300" ISO/Gain: 0 - B

3 x 300" ISO/Gain: 0 - L

30 x 300" ISO/Gain: 0 - Ha

Green, Bortle 4 zone:

Observatorio El Sauce Rio Hurtado , Chile

Feb 23rd, 2023

3 h 45 m

11

1

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Resolution: 4737x2893 px

Scale: 8163 KB

165

I worked on Labor Day. I combined R + Ha using a median of 1.5 to avoid noise from hydrogen in the background. Then processed it like a regular LRGB. No masks or star removal, luckily there aren't many stars here. Lately, I only stretch GSH on the background between stars, trying not to touch the nebula itself, or just stretch the darkest parts of the frame. I think I'll revisit this stack later.

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