Here is the western part of the Veil Nebula, also known as Witches Broom, again as a bi-color image composed of Ha and OIII data taken from my backyard. The Veil is one of the largest and most spectacular supernova remnants. The supernova that created it has exploded 8000 years ago and the remnant has been expanding since then. The entire nebula is 110 light-years across, covering six full moons on the sky as seen from Earth, and resides about 2100 light-years away in the constellation Cygnus.

The bi-color image is based on 29 x 300 sec of Ha and 22 x 300 sec of OIII data. Captured with my Triplet APO 115/800 and the Atik 460EXm using Baader Filters. The OIII data suffers from nasty halos around brighter stars, particularly 52Cyg, and I tried to reduce halos during processing, but some artefacts are still visible. It turned out that my OIII filter was from a faulty batch and it was recalled and replaced by Baader… great customer service. So, I will be back with a halo-free filter…