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Contains:  IC 342
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IC 342 | The Hidden Galaxy, 





    
        

            Kevin Morefield
IC 342 | The Hidden Galaxy

IC 342 | The Hidden Galaxy

Technical card

Resolution: 3747x2810

Dates:Nov. 25, 2019

Frames:
Astrodon Blue: 29x600" -25C bin 1x1
Astrodon Green: 24x600" -25C bin 1x1
Astrodon Ha 5 nm: 24x1200" -25C bin 1x1
Astrodon Luminance: 52x600" -25C bin 1x1
Astrodon Red: 21x600" -25C bin 1x1

Integration: 29.0 hours

Darks: ~20

Flats: ~20

Bias: ~20

Avg. Moon age: 28.30 days

Avg. Moon phase: 1.70%

Bortle Dark-Sky Scale: 3.00

Astrometry.net job: 3085779

RA center: 3h 46' 48"

DEC center: +68° 5' 42"

Pixel scale: 0.728 arcsec/pixel

Orientation: 322.775 degrees

Field radius: 0.474

Locations: Sierra Remote Observatory, Auberry, California, United States

Data source: Own remote observatory

Remote source: Sierra Remote Observatories

Description

There are not many galaxies over 20 x 20 arc-minutes, located well into the northern skies, that have neither a Messier nor an NGC number. I assume this is due to its location on the galactic plane, well hidden in the dust of the Milky Way's spiral arms. Wikipedia states that it would be a naked eye galaxy were it better located. But obscured as it is, it is only Magnitude 9.

The processing challenge here is retaining browned color the dust imparts while still showing the structures of the galaxy. Ha helped that quite a bit. I'd like to look for OIII, but my skies just clouded for a week at least, so for now this is an HaLRGB blend.

To add the Ha, I added the linear Ha data to the Luminance and Red channels. But that produced to pure of a red to accurately represent Ha emissions. To simulate the Hbeta that would be coming from the same structures as the Halpha, I added 25% of the linear Ha data to the Blue channel as well. All of this was done with filemath in CCDStack.

Seeing has fluctuated a lot so I had some good and bad Luminance data. I stacked just the sharpest 1/3 of the Lum in one master and all Lum in another. The sharp master was added to the All Lum master using a luminance mask. This included only the bright parts of the sharp data. That left the shadows to be represented by the less noisy All Lum master.

Noise reduction, unsharp masking, high pass filter, color balance, and saturation were adjusted in PS CC. Star reduction was done in PS using minimum filter and liquefy filters.

Comments

Author

morefield
Kevin Morefield
License: None (All rights reserved)
3696
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Revisions

  • IC 342 | The Hidden Galaxy, 





    
        

            Kevin Morefield
    Original
  • Final
    IC 342 | The Hidden Galaxy, 





    
        

            Kevin Morefield
    B

B

Curves adjustment.

Sky plot

Sky plot

Histogram

IC 342 | The Hidden Galaxy, 





    
        

            Kevin Morefield