NGC 6960, Western Veil Nebula


The famous Western Veil Nebula.

Shorts exposures, only 6 x 600 sec. H-alpha 7nm Baader filter + 6 x 600 sec. OIII Baader filter. with Artemis 11002 bin 2×2 (resolution = 1.46″/pix)  and the CDK 12.5″

All the image processing was made with Pixinsight 1.5.2.

  • R = H-alpha
  • G = syntetic, OIII x 0.8 + H-alpha x 0.5
  • B = OIII

My first narrowband image with the CDK, and the last from Ventalló!

From Wikipedia:

The Veil Nebula, also known as the Cygnus Loop or the Witch’s Broom Nebula, is a large, relatively faint supernova remnant in the constellation Cygnus. The source supernova exploded some 5,000 to 8,000 years ago, and the remnants have since expanded to cover an area of ~3×3 degrees; about 6 times the diameter or 36 times the area of a full moon. The distance to the nebula is not precisely known, with estimates ranging from 1,400 to 2,600 light-years. It was discovered on 1784 September 5 by William Herschel. He described the western end of the nebula as “Extended; passes thro’ 52 Cygni… near 2 degree in length.” and described the eastern end as “Branching nebulosity… The following part divides into several streams uniting again towards the south.”

The Hubble Space Telescope captured images of the nebula. The analysis of the emissions from the nebula indicate the presence of oxygen, sulfur, and hydrogen.

When finely resolved, some parts of the image appear to be rope like filaments. The standard explanation is that the shock waves are so thin, less than one part in 50,000 of the radius[1], that the shell is only visible when viewed exactly edge-on, giving the shell the appearance of a filament. Undulations in the surface of the shell lead to multiple filamentary images, which appear to be intertwined.

Veil Remnant
Observation data: J2000.0 epoch
Type Supernova remnant
Right ascension 20h 45m 38.0s[1]
Declination +30° 42′ 30″[1]
Distance c:a 2’000 ly
Apparent magnitude (V) 7.0
Apparent dimensions (V) 3 degrees (diameter)
Constellation Cygnus
Physical characteristics
Radius 50 ly
Absolute magnitude (V) ???
Other designations NGC 6960,[1] Cygnus Loop, Cirrus Nebula,[1]
Filamentary Nebula,[1]
Witch’s Broom Nebula,[2]

(See also NGC 6992/95)[1]

See also: Diffuse nebula, Lists of nebulae

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