NGC 6992, the Eastern Veil Nebula (astrovienna)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: HD199055 · IC 1340 · NGC 6992 · NGC 6995 · Veil nebula

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NGC 6992, the Eastern Veil Nebula

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NGC 6992, the Eastern Veil Nebula

The Veil Nebula lies about 2400 light years away in Cygnus, high in the northern summer Milky Way. It formed about 10,000 years ago when a star twenty times the mass of our sun exploded in a supernova, casting off the vast amounts of dust and gas that now form the Veil. This image shows only the eastern part of the Veil, which forms a roughly circular structure 130 light years in diameter that is sometimes called the Cygnus Loop. Although this supernova remnant is mostly spherical, we see only the edges of it because the shock waves are so thin that the shell is visible only when viewed exactly edge-on. The thickness of each filament is about 4 billion miles, roughly the distance from Earth to Pluto. Undulations in the surface of the shell lead to multiple filamentary images, which appear to be intertwined.

Version A: HOO palette
Version B: Dynamic Narrowband palette
Final: SHO palette, with Ha "ropes" at the top shifted to red using a color mask

A few unusual processing steps in Pixinsight:
1. The rope-like nebulosity at top was damaged pretty badly by SXT, so I created a mask in PS and ported it into PI to prevent SXT from operating on the areas getting damaged.
2. That nebulosity is pure Ha, so it was green after the color combine. I shifted it to red by doing a hue shift in Curves, with a green color mask.
3. I had to use a superluminance – using max(Ha, OIII, SII) in PixelMath - to bring out the OIII. In the SHO, OIII was strangely faint. After that I used ColorSaturation to resaturate blue.
4. The stars are narrowband. I combined them and used SPCC in its narrowband mode, which worked pretty well, but took a very long time to run.

Original
B
Final
E

NOVAC

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Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	8761957
PixInsight job	32EF866P246QSA8HYFSJ8B7HEM25ZMEV
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h55m59s.99
RA (top/left)	21h00m14s.93
RA (top/right)	20h56m17s.74
RA (bottom/right)	20h51m42s.18
RA (bottom/left)	20h55m42s.58

Dec (center)	+31°26′39″.2
Dec (top/left)	+30°59′15″.4
Dec (top/right)	+32°27′31″.4
Dec (bottom/right)	+31°53′22″.6
Dec (bottom/left)	+30°25′25″.2

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NGC 6992, the Eastern Veil Nebula

NGC 6992, the Eastern Veil Nebula

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NGC 6992, the Eastern Veil Nebula

NGC 6992, the Eastern Veil Nebula

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