M57 HOO-RGB with halo (tight crop from suburbia) (Scott Denning)

Celestial hemisphere: Northern · Constellation: Lyra (Lyr) · Contains: IC 1296 · M 57 · NGC 6720 · Ring Nebula

M57 HOO-RGB with halo (tight crop from suburbia), Scott Denning

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M57 HOO-RGB with halo (tight crop from suburbia)

Powered byPixInsight

M57 HOO-RGB with halo (tight crop from suburbia)

Ring Nebula M57 July-Aug 2023

C8 f/10 from Bortle 5 suburb with ASI2600+Chroma filters + 10Micron mount
R~G~B= 217x60s + 23*180s
Ha = 107x300s + 36*600s
O3 = 131*300s
Total of 40 hours of exposure

Wow, what a bear to collect and process!

Dodged moon, clouds, rain, and hail during summer monsoon season for over a month.

Had to run outside in my underwear twice to cover the equipment during storms.

Huge range of brightness from the ring itself to the outer halo, with the galaxy very dim too.
Did HDR processing for both RGB and Ha, but that didn’t really help.

I cropped everything pretty tight during linear processing.

SPCC, Russ Croman BXT, SXT, NXT

Made a very light nonlinear stretch of starless RGB for the ring, and a much stronger stretch for the background galaxies.

Stretched the heck out of Ha and O3 to get the halo.

Then played with PixelMath for hours to blend the starless RGB ring, NB halo, and RGB background to taste.

HDRMT, LHE, and Curves on nonlinear starless image.

Finally screened the RGB stars back in and did final tweaks in PixelMator Pro.

The Ring Nebula is the remnant of a dead star in the constellation Lyra in summer Milky Way. It’s visible from a dark site with binoculars if you know where to look.As usual, the red coloration is fluorescent hydrogen and the lovely turquoise is oxygen. Dying stars create copious amounts of cosmic water which coats interstellar dust with microscopic icy mantles. This stuff is important for cosmic chemistry that eventually produces planets, plants, and people.

You can see concentric envelopes of gas that have progressively been blown off the stellar remnant over time.

The background is peppered with extremely distant galaxies.

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Status	Basic success
Started	...
Astrometry.net job	8256799
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M57 HOO-RGB with halo (tight crop from suburbia)

M57 HOO-RGB with halo (tight crop from suburbia)

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M57 HOO-RGB with halo (tight crop from suburbia)

M57 HOO-RGB with halo (tight crop from suburbia)

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