Celestial hemisphere:  Northern  ·  Constellation: Camelopardalis (Cam)  ·  Contains:  IC 342
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IC 342, The Hidden Galaxy in Camelopardalis, wadeh237
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IC 342, The Hidden Galaxy in Camelopardalis

Revision title: IC342 - The Hidden Galaxy Reprocessed

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IC 342, The Hidden Galaxy in Camelopardalis, wadeh237
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IC 342, The Hidden Galaxy in Camelopardalis

Revision title: IC342 - The Hidden Galaxy Reprocessed

Equipment

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Acquisition details

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Description

This is IC 342, The Hidden Galaxy in Camelopardalis.

This is a large and bright spiral galaxy.  If it were located elsewhere in the sky, it would be a showpiece, and almost certainly in the Messier catalog.  At its actual location in the sky, it is largely obscured by dust.  This makes it a very difficult visual galaxy, and somewhat challenging to image.  In the raw data I used for this image, the color is fairly red, due to this dust.  To compensate for this, I used PixInsight's PhotometricColorCalibration process - but instead of using an average spiral galaxy as the white reference, I used a KOII star.  This shifted the color away from the red.  The color is probably not completely accurate, but I like it better than the red tinted cast from the dust.

Image capture details are as follows:
  • Captured in 3 nights between 10-17-2022 and 10-19-2022
  • Telescope:  Astro-Physics AP130GTX @ F/6.7
  • Camera: QSI 690wsg-8 with 2nd Generation Astrodon LRGB filters
  • Mount: Astro-Physics AP1600-AE
  • Guiding: OAG with Starlight Xpress Ultrastar and PHD2, "bump guided" (1 second guide exposures with 10 second delay between them)
  • Capture: NINA v2 with Astro-Physics Tools plug-in
  • Tracking Model:  Declination Arc tracking with Astro-Physics APCC Pro, automatically generated by Astro-Physics Tools plug-in for NINA
  • Luminance: 69 x 600 seconds
  • Red: 32 x 300 seconds
  • Green: 28 x 300 seconds
  • Blue: 24 x 300 seconds

Processed in PixInsight

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Revisions

  • IC 342, The Hidden Galaxy in Camelopardalis, wadeh237
    Original
  • Final
    IC 342, The Hidden Galaxy in Camelopardalis, wadeh237
    B

B

Title: IC342 - The Hidden Galaxy Reprocessed

Description: This is a reprocess of IC342.

In the original version, I made an attempt to estimate the color as if the galaxy wasn't obstructed by dust, but I was never really happy with the result.

Since that version, there have been two very important updates for PixInsight and available plug-ins. First, the PixInsight team released the new SpectophotometricColorCalibration tool. And second, Russ Croman released the (amazing, imo) new BlurXTerminator plug-in.

Since SPCC came out, I was planning on redoing this one, but abandoning the idea of "fixing" the color, and just going with the color as it appears in the sky, and not trying to recover the blues and other stuff affected by dust. When BlurXTerminator came out, I decided it was time.

Since moving to the east side of the mountains two years ago, I have been happy with the clear nights (I have *lots* of still-unprocessed data to work through). But the seeing is significantly degraded from what I used to get on the west side of the mountains. After some initial experimentation with BlurXTerminator, I believe that it might just give me an edge to recover some of the resolution that I lost moving over here, and this is an excellent image to demonstrate that. Switching between the original and new version shows the effect of poor seeing, and how BXT helps to mitigate it.

As long as I was going with the natural color, I also wanted to try and bring out some of the dust that affects it. It's quite pervasive in the area, and is visible in the background sky of this new version.

So this is a nearly complete reprocess. I started with the same integrated masters, but processed everything else from scratch using the newly available tools.

I am much happier with this result.

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IC 342, The Hidden Galaxy in Camelopardalis, wadeh237