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 OHS, George  Yendrey
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Eastern Veil Nebula - Caldwell 33 in OHS

Getting plate-solving status, please wait...
Eastern Veil Nebula - Caldwell 33 in OHS, George  Yendrey
Powered byPixInsight

Eastern Veil Nebula - Caldwell 33 in OHS

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Description

Following Astrobin's guidelines, I posted this as a new image rather than a revision since almost 80% of it is new data.

I chose the OHS palette version as the "final" version although have included the SHO for those that prefer it.  Both are good images IMO, so it is a matter of personal preference.

This version is approximately 9 hrs of integration time vs the two hours of the initial version posted earlier.  Both in the full view and in zoomed in to the nebula, the additional detail from the added integration time is very apparent.  It also had an effect on the color balance of the processed image since all three Narrow Band channels (Ha, Sii, OIii) are more closely balanced with the Ha channel being a bit less data than the Sii or Oiii channels.

So, the two palette versions presented here are SHO, and OHS.  I'm leaning toward OHS as my favorite, let me know what you think.  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.  The spectrum of color present is much much greater than that in my prior OSC versions which I found to be a very pleasant surprise.

It is still a bit 'early' for imaging this object for my location; it didn't clear my eastern horizon limit until around 10:45pm my time and just passes meridian at 4 am, just an hour before astronomical dawn.  Clouds are very much an issue over the last three nights, particularly last night as the summer high moved east allowing Gulf humidity to back fill, bringing night time clouds.

UPDATE v2
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I deleted the previous revision and posted an reprocessed OHS and SHO version.  I felt the previous revision was over saturated, almost neon/cartoonish.  The new revisionn is a bit more vibrant than the original with a dark background but more dim detail preserved.  I think both the SHO and OHS version are improved over the original and the first revisions - I left the original OHS for comparison for those interested.
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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 OHS, George  Yendrey
    Original
  • Final
    Eastern Veil Nebula - Caldwell 33 in OHS, George  Yendrey
    E

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Eastern Veil Nebula - Caldwell 33 in OHS, George  Yendrey