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M101 in Ursa Major

Iren
1212391
Category:Deep Sky
Published:
535
M101 in Ursa MajorNGC 5457NGC 5447NGC 5471NGC 5462NGC 5461NGC 5455NGC 5451NGC 5458NGC 5453NGC 5450NGC 5449NGC 5477
Resolution:
2701x2824 px
File size:
13804 KB

Photo description / processing

I wanted to add another 5 hours of exposure, but I remembered that the telescope had been modified, and the diffraction spikes on the stars wouldn’t match. So I reprocessed the old data instead.

Technical information

Telescope/Lens
Sky-Watcher 150/750 pds
Camera
ZWO ASI533MC Pro
Mount
JUWEI 14
Guide Scope
Svbony 60mm
Guide Camera
ASI 120mm
Software
DSS, Siril, Pixinsight
Location
Смоленская область , Россия

Light pollution

Blue, Bortle 3 zone

Date taken

Exposure

  • 37 × 300″ · ISO/Gain: 100 · UV/Ir-cut
  • 50 × 180″ · ISO/Gain: 100 · UV/Ir-cut

Total exposure: 5 h 35 m

Photo versions

M101 in Ursa Major
Current photoUpdated
M101 in Ursa Major

Apr 13th, 2026

5 h 35 m

I wanted to add another 5 hours of exposure, but I remembered that the telescope had been modified, and the diffraction spikes on the stars wouldn’t match. So I reprocessed the old data instead.

Pinwheel M101
Pinwheel M101

Apr 19th, 2025

5 h 35 m

I've accumulated a couple more hours, adjusted the stars and removed the noise.

Show changes
Previous version
Current version

Comments

Evgeniy Osharov
Comment on photo: M101 in Ursa Majorfrom
Allow me to ask what was done in each of the programs? Because the first three both calibrate and stack, so such a mix seems a bit unclear.
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IrenReply to Evgeniy Osharov
Comment on photo: M101 in Ursa Majorfrom
A little bit of everything. In Siril, I worked on the background. In PixInsight, I refined the galaxy's sharpness and did the stretching. In Photoshop, I just adjusted the colors. I'm just getting the hang of PixInsight, and it's still quite challenging for me.
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poppy8micro
Comment on photo: M101 in Ursa Majorfrom
You can try stacking them as they are with different rays, then remove the stars and use the star mask from this stack. Before removing the stars, register the two stacks to each other so that the frame size and position match exactly, and then work with them.
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