Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  IC 1340  ·  LBN 191  ·  NGC 6974  ·  NGC 6979  ·  NGC 6992  ·  NGC 6995  ·  Sh2-103  ·  Veil nebula
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Eastern Veil Nebula - Caldwell 33 in Foraxx, SHO, and OHS, George  Yendrey
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Eastern Veil Nebula - Caldwell 33 in Foraxx, SHO, and OHS

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Eastern Veil Nebula - Caldwell 33 in Foraxx, SHO, and OHS, George  Yendrey
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Eastern Veil Nebula - Caldwell 33 in Foraxx, SHO, and OHS

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Description

My imaging was interrupted by a power supply failure, so only 2 hrs of integration of this target.  However, I felt the results were still good enough that they were worth posting, although I will continue to try to add more integration time (weather permitting).  I changed the orientation slightly; in this setting, the left most portion resembles a Face (to me).  To the far right, Pickerings Triangle is visible.

Given the small amount of integration time and a shortfall of Oiii data within that short time frame, I decided to experiment with palettes on this object.  I was surprised by how different the results were within this monochrome image set, given my prior experience (and struggles) to get a desired result from an OSC data set.  All I can say is monochrome does rule, at least in terms of easier post processing (IMO).

So, the three palettes presented here are ForaxxSHO, SHO, and OHS.  I'm leaning toward OHS as my favorite, let me know what you think.  The Foraxx version resulted in what I would consider the 'normal' color presentation of this object, while the SHO palette version was a bit surprising in how different it appears vs the OSC attempt at a SHO palette that I had used in previous OSC image sets.

I found it both surprising and pleasing to discover the increased range of color variation visible in the SHO and OHS versions from the monochrome dataset, as small as it is.  I'm looking forward to seeing how increased data depth affects the final images.

From Wikipedia:

The Veil Nebula is a cloud of heated and ionized gas and dust in the constellation Cygnus.It constitutes the visible portions of the Cygnus Loop,  a supernova remnant, many portions of which have acquired their own individual names and catalogue identifiers. The source supernova was a star 20 times more massive than the Sun which exploded between 10,000 and 20,000 years ago. At the time of the explosion, the supernova would have appeared brighter than Venus in the sky, and visible in the daytime.  The remnants have since expanded to cover an area of the sky roughly 3 degrees in diameter (about 6 times the diameter, and 36 times the area, of the full Moon).  While previous distance estimates have ranged from 1200 to 5800 light-years, a recent determination of 2400 light-years is based on direct astrometric measurements.  (The distance estimates affect also the estimates of size and age.) 

The Hubble Space Telescope captured several images of the nebula. The analysis of the emissions from the nebula indicates the presence of oxygensulfur, and hydrogen. The Cygnus Loop is also a strong emitter of radio waves and x-rays.  On 24 September 2015 new images and videos of the Veil Nebula were released by the Space Telescope Science Institute, with an explanation of the images.

In modern usage, the names Veil NebulaCirrus Nebula, and Filamentary Nebula generally refer to all the visible structure of the remnant, or even to the entire loop itself. The structure is so large that several NGC numbers were assigned to various arcs of the nebula.  There are three main visual components: 
  • The Western Veil (also known as Caldwell 34), consisting of NGC 6960 (the "Witch's Broom", Lacework Nebula, "Filamentary Nebula"[) near the foreground star 52 Cygni;
  • The Eastern Veil (also known as Caldwell 33), whose brightest area is NGC 6992, trailing off farther south into NGC 6995 (together with NGC 6992 also known as "Network Nebula") and IC 1340; and
  • Pickering's Triangle (or Pickering's Triangular Wisp), brightest at the north central edge of the loop, but visible in photographs continuing toward the central area of the loop.

NGC 6974 and NGC 6979 are luminous knots in a fainter patch of nebulosity on the northern rim between NGC 6992 and Pickering's Triangle.

Comments

Revisions

  • Eastern Veil Nebula - Caldwell 33 in Foraxx, SHO, and OHS, George  Yendrey
    Original
  • Final
    Eastern Veil Nebula - Caldwell 33 in Foraxx, SHO, and OHS, George  Yendrey
    B
  • Eastern Veil Nebula - Caldwell 33 in Foraxx, SHO, and OHS, George  Yendrey
    C

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Eastern Veil Nebula - Caldwell 33 in Foraxx, SHO, and OHS, George  Yendrey