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M33

Category:Deep Sky
Published:
674
M33NGC 592IC 142IC 135IC 133IC 132IC 131NGC 604NGC 598NGC 595NGC 588IC 140IC 139IC 137IC 136IC 134NGC 603IC 143
Resolution:
4446x3338 px
File size:
10392 KB

Photo description / processing

The M33 galaxy in the constellation Triangulum. One of the nearest galaxies to us, it belongs to our galaxy cluster, the Local Group. RGB image. I spent a long time working on it. My eyes got tired, so I took a break. I didn’t add an L channel because I had to reduce the galaxy’s brightness when converting from linear to nonlinear. Something like that... I guess I couldn’t avoid some haze here either. But also, not many frames were captured. As they say, it is what it is.

Technical information

Telescope/Lens
Sharpstar 76 edph 4,5
Camera
Zwo 1600mm
Mount
HEQ 5 Pro
Guide Scope
OAG
Guide Camera
ZWO 220mm
Software
Pixinsight
Location
Мозырь, Беларусь

Light pollution

Yellow, Bortle 5 zone

Date taken

Exposure

  • 20 × 180″ · ISO/Gain: 139 · R ·
  • 13 × 180″ · ISO/Gain: 139 · G ·
  • 18 × 180″ · ISO/Gain: 139 · B ·

Total exposure: 2 h 33 m

Photo versions

M33
Updated
M33

Mar 29th, 2026

3 h 0 m

I've reprocessed my work on the Triangulum Galaxy. It seems there are no more green stars now :)

M33
Current photo
M33

Jan 20th, 2026

2 h 33 m

The M33 galaxy in the constellation Triangulum. One of the nearest galaxies to us, it belongs to our galaxy cluster, the Local Group. RGB image. I spent a long time working on it. My eyes got tired, so I took a break. I didn’t add an L channel because I had to reduce the galaxy’s brightness when converting from linear to nonlinear. Something like that... I guess I couldn’t avoid some haze here either. But also, not many frames were captured. As they say, it is what it is.

Show changes
Previous version
Current version

Comments

CatS
I blend the L channel on a linear image, then everything matches in brightness.
Actually, it's better not to shoot L at all—fewer problems that way.
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Robert NikReply to CatS
I didn't get why I should shoot L either. I've processed about six of them and never ended up using that L anywhere.
I do almost all my processing on the linear image. Stretching is almost always the last step before saving the final result.
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