NGC 7293 Helix Nebula #4 (Molly Wakeling)

Celestial hemisphere: Southern · Constellation: Aquarius (Aqr) · Contains: HD212743 · HD212783 · HD212949 · HD212970 · HD212980 · HD213055 · HD213056 · HD213069 · HD213070 · HD213432 · HD213500 · HD213538 · Helix Nebula · NGC 7293 · PGC 170393 · PGC 170394 · PGC 192340 · PGC 2831352 · PGC 3083239 · PGC 3094569 · PGC 3098405 · PGC 3098406 · PGC 3098407 · PGC 68899 · PGC 69039 · PGC 69066 · PGC 69071 · PGC 69090 · PGC 69093 · PGC 826510 · And 64 more.

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NGC 7293 Helix Nebula #4

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NGC 7293 Helix Nebula #4

Another from the Okie-Tex Star Party: the Helix Nebula!
This is also using the borrowed Nikon 400mm f/2.8 lens and the QHY533M I'm testing for QHY.

The Helix Nebula is a planetary nebula in the constellation Aquarius, and it's one of the closest (bright) planetary nebulae to Earth at a distance of 655 lightyears. Because of its proximity, it appears quite large on the sky as far as planetary nebulae go -- about half the area of a full Moon on the sky. This also means that its light is spread out more, so it is harder to see visually in a telescope, unlike the apparently-smaller Dumbbell and Ring Nebulae. Planetary nebulae are dying main-sequence stars that are ejecting their outer layers of gas out into interstellar space. It's expanding at a rate of 40 km/s, or 89,500 miles per hour!

I'm thrilled and surprised to have picked up the outer ring there on the left! Ordinarily I would expect to need to use a narrowband hydrogen-alpha filter to capture it, but it was dark enough at Okie-Tex, the lens is fast, and the camera is sensitive enough to have picked it up in wideband. This image doesn't even use luminance, just RGB! Totally amazed.

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Status	Advanced success
Started	...
Astrometry.net job	6490725
PixInsight job	ABACK6LTXQGGUSEXRGO14HWOGKISP8P8
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h29m36s.64
RA (top/left)	22h26m13s.47
RA (top/right)	22h26m25s.10
RA (bottom/right)	22h33m01s.79
RA (bottom/left)	22h32m46s.80

Dec (center)	-20°49′30″.0
Dec (top/left)	-20°04′51″.2
Dec (top/right)	-21°37′08″.2
Dec (bottom/right)	-21°33′56″.3
Dec (bottom/left)	-20°01′42″.8

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NGC 7293 Helix Nebula #4

NGC 7293 Helix Nebula #4

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NGC 7293 Helix Nebula #4

NGC 7293 Helix Nebula #4

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