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So what colour is Uranus really?
Airbag
post Dec 5 2006, 09:15 PM
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Thanks! No, I do not have the right glazes for Mars (yet?) but Neptune is next.

Airbag
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JRehling
post Dec 5 2006, 09:23 PM
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QUOTE (Airbag @ Dec 5 2006, 01:15 PM) *
Thanks! No, I do not have the right glazes for Mars (yet?) but Neptune is next.

Airbag


I have a whole set of Venus plates -- came straight from the store!


Kudos on the Uranus plate. Now you have to tell guests "I'm eating..." ... nevermind.
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elakdawalla
post Dec 9 2009, 05:20 PM
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I'm resurrecting this old thread because while the conversation was interesting and produced some great links (I especially like that occultation set of images linked to in post 2 by karolp), the thread never resolved in my mind. I would LOVE to see someone post a side-by-side comparison of Voyager 2 Uranus and Neptune images that show their relative color. It's not hard to get the Voyager 2 data but the production of approximately correct color is still a black art to me. Anybody feel like attempting it? I am also looking for a nice amateur-processed image of Uranus for the Advent Calendar I'm doing in the blog...come on, can anybody do better than the Voyager team did back in 1986?


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ugordan
post Dec 9 2009, 05:27 PM
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Have you tried Views of the Solar System site?


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elakdawalla
post Dec 9 2009, 05:40 PM
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No because I hate that website's over-the-top obnoxious ads so much...


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Antdoghalo
post Dec 9 2009, 08:55 PM
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QUOTE (ugordan @ Dec 9 2009, 12:27 PM) *
Have you tried Views of the Solar System site?


It doesnt have any images from Hayabusa(Which is only mentened breifly in space exploration chronology)
Nor does it have the Steins flyby images Or any images from New Horizons of Ios Tvashtar Patera erupting. sad.gif

But it does have some great maps and images including some good Voyager 2 and Hubble images of Uranus showing some clouds on it. smile.gif


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tedstryk
post Dec 9 2009, 11:08 PM
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QUOTE (elakdawalla @ Dec 9 2009, 05:40 PM) *
No because I hate that website's over-the-top obnoxious ads so much...

It is kind of sad. Calvin Hamilton made pleas for years for users to contribute to the webhosting cost (which at the time were much greater for a site like that than now). Almost no one came forth, and in came the ads.

This is one of the best examples....http://hubblesite.org/gallery/album/solar_system/pr2007032c/

Both worlds are blue-green. The blue appearance of many images is thanks to Voyager color shifting.


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Ron Hobbs
post Dec 9 2009, 11:52 PM
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I have always thought that this was the definitive view of the color of Uranus. To my eye it seems steel gray. Maybe some of those here with artistic eyes can comment on this version.

I too despise the ads of the Views of the Solar System site, though I clicked on it and waded through the ads. The image at this site has a decided greenish caste to my eye. I remember hearing that Uranus is less blue than Neptune because the clouds on Uranus are higher than on Neptune and so there is less of a depth of clear methane gas to absorb the red light. I wonder if there is a seasonal effect at work on Uranus.
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stevesliva
post Dec 10 2009, 12:09 AM
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Adblock Plus seems to be catching them all. I don't see a single one.
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JohnVV
post Dec 10 2009, 01:35 AM
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QUOTE
No because I hate that website's over-the-top obnoxious ads so much...

adds what adds
i use No-script and ad block pulse
along with some sites in my HOST file redirected back to 127.0.0.1 ( about 12,000 of them)

i guess i am a bit spoiled by not seeing 95%+ of the adds
i have always gone with these colors ( except for the now missing "great dark spot")
[attachment=19973:neptune.jpg] [attachment=19974:uranus.jpg]
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tedstryk
post Dec 10 2009, 02:19 AM
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Using Voyager color is treacherous. I strongly recommend Hubble or Voyager OGV images shifted to match Hubble color.


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JGodbaz
post Dec 10 2009, 04:31 AM
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Since the Voyager camera had very little true red response, it's a bit difficult to do anything. Essentially it comes down to inverting a highly singular matrix to recover the spectral curve for each pixel; a pretty standard inversion problem, but no simple regularisation techniques will get you what you want because it's so underdetermined.

I suppose you could probably use low res multispectral images to create a statistical model of how red correlates with the various other colours Voyager actually recorded and try to recreate the missing colours. I'm a bit too busy at the moment to give it a go, but if suitable reference data is available then it ought to be possible at least. Might be worth a paper if someone actually does it!
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4th rock from th...
post Dec 10 2009, 11:13 AM
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If you want to have fun, here are two links to Uranus and Neptune spectra:

http://lasp.colorado.edu/~bagenal/1010/gra..._outplanets.gif

http://solarasph.wikidot.com/the-visual-spectrum-of-uranus

It's possible to derive a global color from the spectral data and use it as a guide to fine tune the images. My understanding (and visual experience at the telescope) is that the colors normally displayed on the released images are OK, apart from a little of saturation.

I'd also say that the color scheme on the forum's skin is actually close to the planet's visual impression!
The title bar with the member's name and post time is Neptune like, and the post body background color is similar to Uranus color.


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machi
post Dec 12 2009, 11:11 PM
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This is my experiment with Uranus images.
But I don't think, that it's in real colors.
It's enhanced color composite (green, orange and blue filter).
Attached thumbnail(s)
Attached Image
 


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Decepticon
post Dec 13 2009, 12:02 AM
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^ So what would it look like in real colour?


Nice to see the faint cloud features.
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