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Contains:  M 43, NGC 1982, M 42, Great Nebula in Orion, NGC 1976, The star θ2Ori, The star θ1Ori
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M42 Orion Nebula (First multi filtered image) Luminance/OIII/Ha, 





    
        

            Michael Southam
M42 Orion Nebula (First multi filtered image) Luminance/OIII/Ha

M42 Orion Nebula (First multi filtered image) Luminance/OIII/Ha

Technical card

Resolution: 2537x1950

Dates:Dec. 5, 2015Dec. 20, 2015Jan. 3, 2016

Frames:
31x300" ISO200 bin 1x1
NBPF Hydrogen-a 12nm: 32x300" ISO300 bin 1x1
Celestron OIII 1.25": 26x300" ISO200 bin 1x1

Integration: 7.4 hours

Darks: ~16

Avg. Moon age: 18.91 days

Avg. Moon phase: 46.36%

Astrometry.net job: 911194

RA center: 5h 35' 14"

DEC center: -5° 22' 37"

Pixel scale: 0.726 arcsec/pixel

Orientation: -159.085 degrees

Field radius: 0.323

Locations: Home Observatory, Shelton, Connecticut, United States

Description

This is my first attempt at combining multiple filtered data sets into 1 image so I thought it best to start with a bright target. This is also my first image with data from different imaging sessions. I summarized my workflow below and comments would be appreciated.

The luminance, OIII and Ha were captured on separate nights. This was the second set of Ha data I collected for this image. The first set would not stack in PI which I put down to the fact that I had captured it at the same ISO and the same exposure length as the Luminance and OIII and as it captured less data, not enough stars were available for stacking. As it turned out, the second set wouldn't stack either, even though the ISO was higher than the previous set's and I had to resort to Deep Sky Stacker.

I had hoped that this image would be made without the help of PhotoShop but that was wishfull thinking. Too many snags along the way like not being able to staralign either the Ha or OIII core data and so having to resort to PhotoShop to incorporate those. The best I can say is that about 75% of the processing was in PI. I guess that will have to do for now.

Big thanks to Harry's Astroshed for the tutorials and Gerald for his narrowband integration tutorial

Processing Workflow
Program - Process/Command - Data Set - Tutorial
Pixinsight - Batch reprocessing Script - Stacking Luminance & OIII - Harry's Astroshed
Deep Sky Stacker - Stack - Ha - Deep Sky Stacker Tutorial by Doug German
Pixinsight - Dynamic Backround Extraction - Lum/OIII/Ha - Harry's Astroshed
Pixinsight - Histogram Transformation - Lum/OIII/Ha - Harry's Astroshed
PhotoShop - Add core data to each data set - Adding a Luminance Layer in Photoshop by Doug German
Pixinsight - Star Alignment - OIII/Ha - narrowband integration tutorial by Gerald
Pixinsight - Pixel Math - Lum/Ha - Harry's Astroshed
Pixinsight - Linear Fit - OIII/Ha - narrowband integration tutorial by Gerald
Pixinsight - Channel Combination - OIII/Ha - Harry's Astroshed
Photoshop - Combine OIII/Ha with Luminance image -

Comments

Author

msoutham
Michael Southam
License: Attribution-NonCommercial-ShareAlike Creative Commons
6342
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Revisions

  • M42 Orion Nebula (First multi filtered image) Luminance/OIII/Ha, 





    
        

            Michael Southam
    Original
  • Final
    M42 Orion Nebula (First multi filtered image) Luminance/OIII/Ha, 





    
        

            Michael Southam
    B

Sky plot

Sky plot

Histogram

M42 Orion Nebula (First multi filtered image) Luminance/OIII/Ha, 





    
        

            Michael Southam

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