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Eastern Veil Nebulae NGC 6992 & NGC6995
Image Details NGC 6992
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How This Image Was Taken

Eastern Veil Nebula


AP155 Refractor @ f7.1
Astro-Physics 1200GTO Mount

SBIG ST-11000M Class 2
SBIG Colour Filter FWL-8

Image Acquisition
MaxIm DL V4.53

Date Taken
7 + 11 September 2007.
Moon phase 0%, mag 4.0 sky.

Exposure Details

R =  5 x 600 sec 1x1 binned
G =  5
x 600 sec 1x1 binned
B =
5 x 600 sec 1x1 binned
Lum 10 x 600 sec
1x1 binned
Images dithered
CCD Temp @ -20

Image Processing
Raw Lum, RGB, Dark, Bias, Flat and Flat Dark frames acquired in MaxIm.
Raw images reduced & combined, normalised and Luminance master deconvolved in CCDStack.
RGB colour master prepared in CCDStack using RGB filter colour ratios 5:3:6

Final LRGB combine, colour balancing and star processing in PS CS2



Click for 1900x1200 crop of original


Image Details NGC 6992 & 6995

Also Known As

Caldwell C33
Part of the Veil nebula Complex
Part of the Sharpless 103 HII Region and the Cygnus Loop


Position RA and Dec
In this image North is top centre. The image centre is at GSC 2688:1077
RA: 20h 55m 54s
DEC: +31
° 26m 32s J(Now)

Highest Altitude at This Site
Approx 58°


About 1400 light years.

Size & Magnitude
The NGC 6992 field is approx 54 x 33 arcminutes - ie ~ 2 x 1 Moon diameters. The image is a 1900 x 1200 crop of the full resolution wide field image below.

The wide field image of Caldwell C33 is 112 x 77 arcminutes

What it is
These glowing filaments of interstellar shocked gas are part of a larger spherical supernova remnant known as the Cygnus Loop or the Veil Nebula -- expanding debris from a star which exploded over 5,000 years ago. The other main components of the Cygnus Loop are West of  C33 and are called Pickerings Triangle and the Witches Broom nebula