The Eastern Veil (also known as Caldwell 33), whose brightest area is NGC 6992, trailing off farther south into NGC 6995 (together with NGC 6992 also known as Network Nebula). 

The Veil Nebula is a cloud of heated and ionized gas and dust in the constellation Cygnus.  It constitutes the visible portions of the Cygnus Loop, a supernova remnant, many portions of which have acquired their own individual names and catalogue identifiers.

The source supernova was a star 20 times more massive than the Sun which exploded between 10,000 and 20,000 years ago. At the time of explosion, the supernova would have appeared brighter than Venus in the sky, and visible in daytime. 

The remnants have since expanded to cover an area of the sky roughly 3 degrees in diameter (about 6 times the diameter, and 36 times the area, of the full Moon). 

While previous distance estimates have ranged from 1200 to 5800 light-years, a recent determination of 2400 light-years is based on direct astrometric measurements. (The distance estimates affect also the estimates of size and age.)

Emission estimates from the Hubble Space Telescope captured  images indicate the presence of oxygen, sulfur, and hydrogen in the nebula.

The Cygnus Loop is also a strong emitter of radio waves and x-rays.  [Source:  Wikipedia].

The image was captured with the iOptron CEM120 mount , the TMB80SS F6.3 Refractor coupled with an Orion Field Flattener , and my old Canon 450D XSi camera.
All subs were taken a ISO1600 and 300s each.  All were done at ambient temperature that varied between 32C and 38C.

IMAGE information -- 2021
Subs (ISO1600, 300s): 99 subs (8.25hr) on Aug 4th, 6th and 7th.

Processing was done with PixInsight, following reasonably good practices I’ve developed over the years.

COMMENTS:
My trusty Atik 383L+mono CCD camera is in Portugal being repaired, or is lost.  We’ll see on that.

This is the first time the Canon 450D XSi has been used since 2012 (9 years).  Somewhat amazed that it still worked after sitting in the closet for that length of time.

The Eastern Veil Nebula is very faint and I’m surprised the camera was able to get a decent image.  Not great, but not bad. 

I see in my M42 image done back in 2012 that I also used an Orion Skyglow filter.  This would have been used to reduce the effects of light pollution.  I’m pretty sure that I can still find that filter, but have no idea how it was mounted.