NGC 6992

NGC 6992 Ha OIII Eastern Veil

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.) [Wikipedia]

Technical data

  • Optics: William Optics Megrez 120
  • Camera: Atik 383L+ mono
  • Mount: Avalon Linear
  • Filters: Baader Planetarium 36mm H-Alpha  ·  Baader Planetarium 36mm OIII
  • Guiding system: Lodestar Starlight Xpress, Atik OAG
  • Accessories: Atik EFW filter wheel
  • Acquisition: Maxim DL, PHD2
  • Post-processing: Astro ART – PS5
  • Dates: 2014-07-15,2014-07-17,2014-07-27,2014-08-04,2014-09-03
  • Exposure details: Ha-OIII ->(23×20):(16×20)All Bin1 [num x minutes]
  • Bias/Dark /Flat: 35-15-15
  • Cooling Details: -15°C
  • SQM-L: 18.30
  • Integration: 9h 45′
  • Location: Home