Celestial hemisphere:  Northern  ·  Constellation: Vulpecula (Vul)  ·  Contains:  14 Vul  ·  Dumbbell nebula  ·  M 27  ·  NGC 6853  ·  PK060-03.1  ·  The star 14Vul
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Messier 27 (OSC), Linda
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Messier 27 (OSC), Linda
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Equipment

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Acquisition details

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Description

2023 description:

I wanted to see if I could apply the things I've learned in the last five years to this old and not very good data. I used the wrong gain and too many of my stars are clipped in at least one channel. But I was hoping that I could treat the data more gently than I did back in 2018 and make an improvement.

Processing 2023:
dynamic crop
DBE
SPCC
blurXterminator
starXterminator
GHS
LHE
MLT (mild sharpening)
Curves (contrast)
pixel math in stars

stars
GHS

2018 description:
I've been having trouble making the transition from unguided DSLR photography to guided low focal length refractor imaging for the last few months. Part of it was a couple of mount issues and part of it was me, but I think I've worked through most of the issues, at least well enough to get some decent data.

The is a medium crop of a wider field around M27. The plan was to let the system image all night while I slept but, of course, 90 minutes or so later, the clouds started scooting through the sky despite the forecast for clear skies. I ended up getting 80 subs of 60 seconds each.

I found the processing on this challenging, so much so that I want to go back and revisit it. Dealing with all those stars and all that dust in that region of the Milky Way was a bit beyond my meager skills. Even so, I'm happy to have finally got something usable and I'm looking forward to upping my processing game.

Many of the stars have a pinkish cast to them. I don't think I created that in processing. I'm assuming it's caused by dust causing a reddish shift in the color of the stars shining through the dust. If anyone can say for sure, please let me know.

This was also my first attempt with a ZWO ASI294MC Pro and I think I'm really going to like the camera. I can easily see the difference in the noise compared to an uncooled DSLR though it does give up a bit on field of view.

[I did get back to this and it's posted as revision B. I'm happier with this one but the stars still seem a bit overwhelming. Still a lot to learn about image processing...]

Comments

Revisions

  • Messier 27 (OSC), Linda
    Original
  • Messier 27 (OSC), Linda
    B
  • Messier 27 (OSC), Linda
    C
  • Final
    Messier 27 (OSC), Linda
    E

B

Description: This is a reprocessing of the earlier image. It proves that I shouldn't try to process an image on only three hours sleep (as I did the first image) and that doing this takes some deliberation and thought. I'm a lot happier with this version though it was still a challenge keeping those thousands of stars from getting out of control. Constructive criticism is welcome!

Uploaded: ...

C

Description: This revision attempts to tame the stars.

Uploaded: ...

E

Title: 2023 Reprocessing

Description: I wanted to see if I could treat some old and not very good data better in 2023 than I had in 2018. See description for details.

Uploaded: ...

Sky plot

Sky plot

Histogram

Messier 27 (OSC), Linda

In these collections

Broadlands