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M57 - getting there (wip)


wimvb
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This target is a pain to process. The dynamic range is huge; it has probably more dynamic range than the Orion nebula.

I'm still not quite satisfied. Too aggressive deringing during deconvolution made the stars too soft, and they won't reduce properly. This means having to start from almost scratch to get it right.

Still, not too bad so far either.

Comments welcome.

M57_HaRGB.thumb.jpg.61806467ef3d970000b6c6f072ac0763.jpg

Data from the Liverpool Telescope on La Palma.

This is a HaRGB combination with various exposure times for rgb. Ha at 120 sec/sub.

Pixelscale 0.28" per pixel; aperture 2 m

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5 hours ago, gnomus said:

Stunning Wim.  Are the stars a bit magenta?  (Probably not I'm viewing on one of those iPad thingamajigs.)

They may very well be. Will see how they come out in the next version

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Looks great--nice details starting to show in the ring walls.  Never get that with a smaller scope.  Have you tried reducing the brightness of the ring itself?  There is allot of light there.  Not sure, but the background looks a tad reddish to me--though that may be Ha that is supposed to be there.

Rodd

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38 minutes ago, Rodd said:

Looks great--nice details starting to show in the ring walls.  Never get that with a smaller scope.  Have you tried reducing the brightness of the ring itself?  There is allot of light there.  Not sure, but the background looks a tad reddish to me--though that may be Ha that is supposed to be there.

Rodd

The outer ring is mainly Ha, so it's supposed to be red. I could also put a tiny amount in the blue channel, to indicate Hb. With the outer ring as 'bright' as here, the main nebula would be completely blown out if not tamed in some way. Actually comparable to the Trapezium in the Orion Nebula.

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