The Sharpless 119 is a bright nebula just out of the field of view of the North
American Nebula (NGC 7000). Unlike the North American I decided
to shoot this in the conventional Hubble Pallet. It is mostly Hydrogen
with only small amounts of Oxygen and Sulfur. That made processing a
challenge since increasing the relative contributions of these tried to make
the stars in those filters expand. Careful use of masks during
processing was critical to get the final image.
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 in the center 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that the final image no longer represents the amounts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
Note North American is marked as SH117 in
Zoomable Image in SHO
The full size image is just under 4096x4096. The following will allow
the reader to zoom into the image to explore it more closely.
Data was collected in September 2015 at -25C. Amazingly this is the
first narrowband project to complete within one month. The 1100AE was self
guiding through all exposures.
All images were processed by Pixinsight.
For general details on the processing of this image see.