M42 - Orion Nebula (Andres Salaverria)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: 41 the01 Ori · 43 the02 Ori · De Mairan's nebula · Great Orion Nebula · LBN 974 · M 42 · M 43 · Mairan's Nebula · NGC 1976 · NGC 1982 · Orion Nebula · Sh2-281 · The star θ1Ori · The star θ2Ori

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M42 - Orion Nebula

Revision title: M42 - Processed in APP and PI

Powered byPixInsight

M42 - Orion Nebula

Revision title: M42 - Processed in APP and PI

This is a beautiful and a relatively easy target. I was doing some imaging with my Celestron, since I am having some problems with guiding and artifacts on stars. I decided to image M42, since it was just there. This image was taken with an IDAS Light Pollution (IDAS LP D2) filter. In a different set of images, I actually proved (to myself) that the artifacts are very likely created by the filter. If/when I use just an IR filter they are not as prominent. You will see that the stars exhibit what appears to be color aberration. Anyway, back to M42. I processed the image using AstroPixel Processor (APP). There was no calibration (no flats, no darks, no bias). Like I said, this was unplanned and a very small set of subs. Removed light pollution with APP, and then a very minor cropping in Adobe Photoshop to remove some imperfections at the corners (due to dithering).

To continue the experiment, I processed the image further in PixInsight. Performed photometric color calibration. As I was stretching the image I wasn't sure if I should link or not the RBG channels. The results are quite different. I believe the one not linking the channels has less "red" in it. Not sure why, but I am sure it's explained somewhere. I finished them with curves transformation. In both cases I had to finish the editing in PS to remove the corners as above.

I left as final the one that I like the most. Which one do you prefer?

Original
B
Final
C

B

Title: M42 - Additional editing with PI

Uploaded: ...

C

Title: M42 - Processed in APP and PI

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	5427524
PixInsight job	OAXAZB5B5R6KUAAET0EZNU7JMVVS0ZWO
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h35m15s.973
RA (top/left)	05h36m21s.160
RA (top/right)	05h34m38s.811
RA (bottom/right)	05h34m10s.885
RA (bottom/left)	05h35m53s.260

Dec (center)	-05°24′02″.40
Dec (top/left)	-05°15′13″.39
Dec (top/right)	-05°08′03″.20
Dec (bottom/right)	-05°32′50″.45
Dec (bottom/left)	-05°40′01″.20

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M42 - Orion Nebula

Revision title: M42 - Processed in APP and PI

M42 - Orion Nebula

Revision title: M42 - Processed in APP and PI

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M42 - Orion Nebula

Revision title: M42 - Processed in APP and PI

M42 - Orion Nebula

Revision title: M42 - Processed in APP and PI

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