Displaying the monochrome Ha image in a local exhibition of pictures was a spur to getting to grips with the colour data I’ve acquired for this image. With the Ha & RGB data this now amounts to 51 hours in 10 & 20 minute sub-frames.
The image is reduced to 40% of full size for display here (click on the thumbnail).
This object is the remnant of a supernova explosion that occurred some 40,000 years ago and the shell has been expanding ever since. It now spans about 3 degrees on the sky, which at it’s estimated distance of 3000 light years is 157 light years in diameter.
This image was published in the June 2017 edition of Astronomy Now.