So what colour is Uranus really? |
So what colour is Uranus really? |
Dec 5 2006, 09:15 PM
Post
#16
|
|
Member Group: Members Posts: 408 Joined: 3-August 05 Member No.: 453 |
Thanks! No, I do not have the right glazes for Mars (yet?) but Neptune is next.
Airbag |
|
|
Dec 5 2006, 09:23 PM
Post
#17
|
|
Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
|
|
|
Dec 9 2009, 05:20 PM
Post
#18
|
|
Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
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?
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
|
|
|
Dec 9 2009, 05:27 PM
Post
#19
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Have you tried Views of the Solar System site?
-------------------- |
|
|
Dec 9 2009, 05:40 PM
Post
#20
|
|
Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
No because I hate that website's over-the-top obnoxious ads so much...
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
|
|
|
Dec 9 2009, 08:55 PM
Post
#21
|
|
Member Group: Members Posts: 224 Joined: 13-October 09 From: Olympus Mons Member No.: 4972 |
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. But it does have some great maps and images including some good Voyager 2 and Hubble images of Uranus showing some clouds on it. -------------------- "Thats no moon... IT'S A TRAP!"
|
|
|
Dec 9 2009, 11:08 PM
Post
#22
|
|
Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
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. -------------------- |
|
|
Dec 9 2009, 11:52 PM
Post
#23
|
|
Member Group: Members Posts: 204 Joined: 14-April 06 From: Seattle, WA Member No.: 745 |
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. |
|
|
Dec 10 2009, 12:09 AM
Post
#24
|
|
Senior Member Group: Members Posts: 1582 Joined: 14-October 05 From: Vermont Member No.: 530 |
Adblock Plus seems to be catching them all. I don't see a single one.
|
|
|
Dec 10 2009, 01:35 AM
Post
#25
|
|
Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
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] |
|
|
Dec 10 2009, 02:19 AM
Post
#26
|
|
Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Using Voyager color is treacherous. I strongly recommend Hubble or Voyager OGV images shifted to match Hubble color.
-------------------- |
|
|
Dec 10 2009, 04:31 AM
Post
#27
|
|
Newbie Group: Members Posts: 16 Joined: 30-March 08 Member No.: 4078 |
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! |
|
|
Dec 10 2009, 11:13 AM
Post
#28
|
|
Member Group: Members Posts: 378 Joined: 21-April 05 From: Portugal Member No.: 347 |
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. -------------------- _______________________
www.astrosurf.com/nunes |
|
|
Dec 12 2009, 11:11 PM
Post
#29
|
|
Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
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). -------------------- |
|
|
Dec 13 2009, 12:02 AM
Post
#30
|
|
Senior Member Group: Members Posts: 1276 Joined: 25-November 04 Member No.: 114 |
^ So what would it look like in real colour?
Nice to see the faint cloud features. |
|
|
Lo-Fi Version | Time is now: 23rd April 2024 - 07:05 AM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |