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that the final image no longer represents the amounts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
of them.
Note North American is marked as SH117 in
this map
Annotated Image
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.
Processing Details
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.
Filter
Exposure
Hydrogen
17x900
Oxygen
18x900
Sulfur
21x900
All images were processed by Pixinsight.
For general details on the processing of this image see.
Copyrights For Photos
(c) 2015 Robert J Hawley.
Except as noted,all work on this site by Robert J. Hawley is copyrighted
under a Creative
Commons
Attribution-Noncommercial-Share Alike 3.0 United States License. This
permits the non commercial use of the material on this site, either in whole
or in part, in other works provided that I am credited for the work.
