Author Topic: A Different View of the North American Nebula  (Read 2411 times)


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A Different View of the North American Nebula
« on: September 17, 2015, 12:53:49 PM »
The North American Nebula (NGC 7000) is one of the most popular imaging targets in the northern hemisphere.  Almost every imager has a shot of it plus the nearby Pelican (IC 5070). Normally these images are either in color (L + RGB) or Hubble Palette (Suflur, Hydrogen, Oxygen).  My test shots of the nebula convinced me that using Nitrogen rather than Sulfur would make for more interesting image.

In most narrowband images of this object the "Hydrogen" component is actually H + Nitrogen.  The Nitrogen line is close enough to the H alpha line that it requires a 3 nm filter like I am using to separate the two. Doing so opens the possibility of viewing a nebula in a different way.  Note that the Hubble also uses 3 nm filters so their Hydrogen is just Hydrogen.

The processing of these images was greatly influenced by the 2014 Katonah NY Pixinsight workshop.  Applying what I learned in Katonah gives an image that is much richer in color.  Without the color processing Green (Hydrogen) would dominate the image. The rich colors along the edges of the nebula become apparent in the more balanced image.  It should be noted that the final image no longer represents the amounts of the three elements.  It does make it easier to see the distribution of them.

I am thinking about taking another shot at an APOD.  Let me know if you think I have a chance.

John Pierce

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Re: A Different View of the North American Nebula
« Reply #1 on: September 17, 2015, 04:34:34 PM »