The Eastern Veil Nebula (NGC 6992) in the Hubble palette

Posted by CraigAndTammy
on Monday, July 11, 2011

by Craig and Tammy Temple

This is our very first image that we processed using the HST palette.  We used the standard mapping: H-alpha = green, SII = red, & OIII = blue.  We just tried to have fun with it and adjusted to colors to what looked "pretty" to our eyes Wink

Found in the constellation Cygnus (The Swan), the Eastern portion of the Veil Nebula supernova remnant, also known as Caldwell 33, is comprised of three portions. The brighter portion is NGC 6992 and connects with NGC 6995 and IC1340. It is displayed here in false color representation using the Hubble Space Telescope (HST) palette. Narrowband filters were used to isolate the hydrogen-alpha (Ha), oxygen-3 (OIII), and sulfur-2 (SII) emissions and reveal the structure of the nebula. Discovered in 1784 by William Herschel, The Veil complex (or Cygnus Loop) appears dim since it is spread over a large area. The source supernova violently exploded some 5,000 - 8,000 years ago leaving only these expanding filaments behind.

Telescope: Stellarvue Raptor SVR105 @ f/7
Accessories: Stellarvue SFF7-21 flattener; Dew control by Dew Buster
Mount: Orion Atlas EQ-G controlled by EQMOD performance tuned by Astrotroniks
Camera: QSI583wsg CCD @ -10.0C
Guiding: Starlight Xpress Lodestar via PHD
Filters: Astrodon 5nm Ha, OIII, SII
Exposure: 12 x 20min. OIII & SII, 11 x 20min. Ha
Acquisition: ImagesPlus 4.0c Camera Control
Processing: Calibration, DDP in Images Plus v4.0; Registration in Registar
Post-processing: Adobe Photoshop CS5; Hubble palette R=SII, G=Ha, B=OIII
Date(s): June 30, 2011, July 2, 2011 & July 9, 2011
SQM reading (begin - end): N1:19.21-19.20; N2:19.00-clouds; N3:18.84-19.14
Temperature (begin - end): N1:76.8ºF-68.5ºF; N2:78.8ºF-73.8Fº; N3:78.3ºF-71.6Fº
Location: Hendersonville, TN, USA

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