NGC 6992: part of Veil Nebula

 About 7,500 years ago that star exploded in a supernova leaving the Veil Nebula, also known as the Cygnus Loop.
NGC 6992 is  east part of  the Veil Nebula,  it lies about 1,400 light-years distant.

Imaging telescopes or lenses: Explore Scientific ED102 APO
Imaging cameras: Canon EOS Rebel T3i
Mounts: Celestron CGEM Hypertuned
Guiding telescopes or lenses: Orion ShortTube 80
Guiding cameras: Orion StarShoot Autoguider
Focal reducers: Astro-Tech AT2FF
Software: Main Sequence Software Sequence Generator Pro, Scott Davis AAPPS, Luc Coiffier’s DeepSkyStacker, Adobe Photoshop CS6
Filters: One-Shot Color, Astronomik 12nm OIII Clip-In Filter, Astronomik 6nm Ha Clip-In Filter
Accessories: Robofocus, Home Made Peltier Cooler for T3i
Astronomik 12nm OIII Clip-In Filter: 235×180″ ISO1600
Astronomik 6nm Ha Clip-In Filter: 142×300″ ISO1600
One-Shot Color: 51×150″ ISO1600
Integration: 25.7 hours
Darks: ~43
Flats: ~40
Flat darks: ~40
Bias: ~40

Author: Scott Davis
AstroPhotography of the day by SPONLI
18 June 2014