M57 with 2nd halo ring (lowenthalm)

Celestial hemisphere: Northern · Constellation: Lyra (Lyr) · Contains: IC 1296 · M 57 · NGC 6720 · PGC 2024204 · PGC 2813669 · PGC 2813726 · PGC 2813749 · PK063+13.1 · Ring nebula · Ring nebula in Lyra

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M57 with 2nd halo ring

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

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M57 with 2nd halo ring

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

This is my attempt at capturing the 2nd outer ring of M57 along with the inner ring in "natural" human-vision-like color. The image seems to show that the 2nd halo (there is an even bigger 3rd one that you can't see here) is actually blue-green with H-beta and OIII emission with a fringe of red H-a and and some knots of H-a within the blue-green ring where the H-a band emission rises above that of the H-beta and OIII emission.

Note that all images were obtained by live-stacking 1.5 second exposures in SharpCap 3.2. Astrobin doesn't support fractional exposures.

This has been sitting in the can for a few weeks waiting to be fully processed. I probed the data enough to know I had reasonably captured the 2nd outer ring in a fairly natural color, but couldn't figure out how to compress all the orders of magnitude brightness to show it all at once.

I finally tackled it in earnest today and got a decent result. The image is a somewhat unholy mixture of 24 minuted of RGB IR/UV cut filter data, 30 minutes of IDAS LPR filter data and and 84 minute of data taken through a visual UHC filter. I know what your thinking, "the UHC is for visual", but this data was captured during a full moon and its what I own, so it was the only solution I had. A UHC filter is a poor-man's tri-band filter passing H-alpha, H-beta and OIII spectral lines.

As to how to mix them, I realized they were all captured with my RGB camera which is based on a 4K video chip designed for reproducing human vision. So I just added them together (with a little RMS noise balancing prior to adding) and went from there. A strange stretch procedure, but it worked out ok except for the stars, which are a little odd, with some glows around the brighter ones caused by the UHC filter.

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Status	Advanced success
Started	...
Astrometry.net job	2826507
PixInsight job	UMF7GBYF7GGPQ4IWK7MIUPM7V0C2CCEN
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	18h53m36s.886
RA (top/left)	18h53m37s.465
RA (top/right)	18h52m39s.945
RA (bottom/right)	18h53m36s.321
RA (bottom/left)	18h54m33s.891

Dec (center)	+33°02′09″.12
Dec (top/left)	+33°14′45″.76
Dec (top/right)	+32°58′05″.35
Dec (bottom/right)	+32°49′31″.90
Dec (bottom/left)	+33°06′11″.24

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M57 with 2nd halo ring

M57 with 2nd halo ring

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M57 with 2nd halo ring

M57 with 2nd halo ring

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