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Neptunian System Imaging
StargazeInWonder
post Aug 2 2022, 05:24 PM
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The Neptune imagery at the first link is really fantastic. It seems easy to see how the major patterns are evolving over a few years.
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titanicrivers
post Sep 21 2022, 06:59 PM
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Nice JWST image of Neptune's rings on today's NASA Webb page here: https://www.nasa.gov/feature/goddard/2022/n...ings-in-decades
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Phil Stooke
post Sep 21 2022, 07:25 PM
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Great image of the rings.

If you take a radial sample of the rings you can map the brightness variation. Take lots and you can average them. Here I have averaged many radial samples to create a synthetic view of just the rings in a polar view. I don't see any sign of the clumps in the rings in the original image, but even if present they would be erased by the averaging process here.

Phil

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... because the Solar System ain't gonna map itself.

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titanicrivers
post Oct 6 2022, 06:09 PM
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Hey Phil, can you explain a bit how to 'take a radial sample' as you did in your post above. Thanks
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Phil Stooke
post Oct 6 2022, 07:39 PM
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Simplest approach:

The oblique view makes the rings look like an ellipse. draw a line through the long axis of the ellipse and measure the brightness along it. Add the left and right sides together to reduce noise, and rotate that in a circle.

More sophisticated: stretch the image perpendicular to the long axis so the rings look circular. Take multiple radii out through the rings in the sectors which are less obstructed by the planet itself. Add together to get an average and rotate that in a circle.

My version was more like the second.

Phil


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... because the Solar System ain't gonna map itself.

Also to be found posting similar content on https://mastodon.social/@PhilStooke
NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain)
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Ian R
post Dec 21 2022, 05:31 AM
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86 wide-angle Voyager 2 frames were merged to create this view of Neptune, two of its brightest rings, and many background stars. The clear filter images were obtained on August 26th, 1989, over a period of 19 hours as the spacecraft departed the ice giant.

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Ian R
post Dec 22 2022, 05:09 PM
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Over 24 hours, on August 31st, 1989, Voyager 2 collected 182 narrow-angle clear-filtered frames. Together they create this view of Neptune, the Adams and Le Verrier rings, and some background stars. The planet's shadow cuts across the Le Verrier ring at top center.

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Edit: replaced with superior version.


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