NGC 6960. The 'Witches Broom' or 'Western Veil' section
of the Veil Nebula complex.
The aptly named 'Witches Broom' is part of the remains of a star that
went supernova between 5 and 8000 years ago and can be found in the constellation
of Cygnus. The bright star in the centre is 52 cygni, a naked eye star
in reasonable conditions, so it's quite easy to find this nebula, although
it's quite faint.
As so many well known objects were, it was discovered by William Herschel,
on the 5th September 1784.
Click on image below for full size
The image is a combination of narrowband data for the nebula, and RGB
for the stars. Ha alpha was used for red, OIII for blue, and a 50/50 mix
of Ha and OIII for green. The Ha/OIII was also used as a luminance layer
for the nebula, although only at 50% opacity.
Data was obtained over several sessions from July to September 2011 from
Telescope. TMB 80/480 F6
Camera. Atik 16HR.
Ha. 31 x 600s.
OIII. 34 X 600s.
RGB ( 16 of each). Red @ 40s, Green @ 30s, Blue @ 50s.
Total imaging time. 11 hrs 22 minutes.