The Veil Nebula is a supernova remnant in Cygnus about 1,400 Lyrs away.
a favorite target even within city limits.
This project started out as just some Hydrogen Alpha images of the
Western Part of the Veil (NGC 6995). When I saw how well the
from the first nights were coming out I decided to expand the project
to the entire Veil. This page describes the mosaic of full nebula
constructed from H alpha images. I am
also working on Oxygen III and Nitrogen which will produce a false
image. For those pictures see the color
The images for this project were taken from mid June to Aug 2,
2011. On many of the nights there was significant moonlight, but
the narrowband filter excludes most of the impact of the moon.
- Veil Nebula
- Zoomable Half Scale Image
- Building the Mosaic
- Image Processing
- Copyrights for Photos
Zoomable Full Scale
The full size image is huge. To make viewing reasonable on the
Internet this is a zoomable image that will allow you to zoom in to
see the details of the nebula structure.
Building the Mosaic
The image is made from 8 different panels. The principle panels
are shown in the drawing below. Each subexposure was 720 seconds
using a 3NM Astrodon Halpha filter.
click for a larger image
Altogether 2,184 minutes of exposures were used for the final mosaic or
36.4 hours. In all over 40 hours of images were taken and the
The Mosaic was built from the following panels laid out about as you
see below. Note there is considerable overlap between panels. Three
corners and central section were mostly just stars so the final image
does not have gaps. They contain fewer subexposures and thus are
nosier. These are mostly overlaid with other panels. The NW
corner contained the nebula. These images are a simple STF stretch
without further processing.
The processing of these images follows the general steps in my Sample Workflow. All
processing was done with
The individual panels were then combined using StarAlignment. I
tried to use the new Gradient Tool, but it encountered some problems.
The final image was produced using
- Generate Range Mask(for deconvolution and atrous)
- Generate Star Mask(for deconvolution)
* The linked images are linear and were
temporarily stretched with STF
Zoomify was done with Photoshop.
Note that DBE was not required. The images had no detectable
gradient even though many were taken with significant moonlight.
Copyrights for Photos
Except as noted, all work on this site by Robert J.
is licensed under a Creative
Commons Attribution-Noncommercial-Share Alike 3.0 United States License.