The Eastern Veil in Hydrogen Alpha (NGC 6992)

Eastern Veil in Hydrogen Alpha
All Images Copyright Steve Cannistra

Please click here or on image for a higher resolution view.

Magnitude:  Roughly magnitude 5.0
Size: about 80'
Distance: 2600 light years
RA: 20h 56m 34s
Dec: 31 degrees 43' 54"

The Eastern Veil (NGC 6992) is a supernova remnant that is part of a larger complex that includes the Western Veil (NGC 6960).  It is estimated that the supernova explosion occured about 10,000 years ago, before the age of recorded history.  The star that gave rise to this supernova remnant is no longer visible, but it must have been massive.  During a star's life, nuclear fusion produces elements such as oxygen, silicon, carbon, and iron.  These elements are expelled into space during supernova explosions, later to become part of other stars, planets, and lifeforms like ourselves.  The Eastern Veil is the brightest component of the Veil Complex and contains several subdivisions.  Although relatively faint, the Veil Complex is a stunning view at dark sites using large aperture scopes, especially with the use of an OIII filter.

Photographic Details:

Date:  June 11, 2004
Takahashi Sky 90 at f4.5 with field flattener/focal reducer, on the G11 Losmandy Mount.
Autoguider:  SBIG STV with e-finder.
Camera:  SXV-H9
Astronomik Ha filter (13 nm bandpass).
Exposures:  14 x 5' each, 70 minutes total.
Conditions:  Temperature 50 degrees F; average transparency; average seeing; calm.
No dark, bias, or flat frames used.  Auto-aligned in MaximDL; Sigma combined using RC Sigma Reject MaximDL, followed by DDP in ImagesPlus (IP).  Subsequent levels and curves adjustments in Photoshop CS (16 bit format).  This was fun to process- lots of faint signal as well as interesting nebula structures to work with.

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