The Eastern Veil in Hydrogen Alpha (NGC 6992)
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
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
is no longer visible, but it must have been massive.
During a star's life, nuclear
produces elements such as oxygen, silicon, carbon, and iron.
elements are expelled into space during supernova explosions, later to
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
the use of an OIII filter.
Date: June 8, 2005
FS-102 at f6 with TOA-130 focal reducer, on the G11 Losmandy
Autoguider: SBIG STV with
Camera: Maxcam CM10 (Finger Lakes Instruments).
Filters: Astrodon 6nm
bandpass Ha filter.
12 x 10' each Ha. Total
exposure duration 2 hours.
Conditions: Temperature 80 degrees F dropping to 65
degrees at end of session (I needed to refocus every 30 minutes); below
transparency; humid; poor seeing; intermittent breeze. Imaging
performed at -20 degrees C throughout.
subs were debloomed with Ron Wodaski's Debloomer software, and then
aligned in Registar. Sigma combined using RC Sigma Reject
MaximDL, followed by DDP
in ImagesPlus (IP). Subsequent
levels and curves adjustments in Photoshop CS (16 bit format).
note: Graphics on this website
may not be reproduced without author permission.
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