Water Ice Confirmed!, White stuff sublimates away |
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Water Ice Confirmed!, White stuff sublimates away |
 Jun 19 2008, 07:10 PM
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#1
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 Senior Member  Group: Members Posts: 3534 Joined: 1-October 05 From: Croatia Member No.: 523  |
Here's a flicker between sol 21 and 24 showing change (or, rather, lack of):
 Ignore the color of the brightest part of the white stuff, it's overexposed. The small white chunk in sol 21 image appears to disappear in sol 24 (inset). -------------------- |
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Jun 19 2008, 07:27 PM
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#2
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Member Group: Members Posts: 435 Joined: 24-March 04 From: Finland Member No.: 63 |
QUOTE (ugordan @ Jun 19 2008, 07:10 PM)  Ignore the color of the brightest part of the white stuff, it's overexposed. The small white chunk in sol 21 image appears to disappear in sol 24 (inset). Are you referring to the chunk that appeared on sol 19 and the was smeared into smaller bits on sol 20? Hard to say in the shadow, but those chunks may have indeed disappeared. -------------------- Antti Kuosmanen
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Jun 19 2008, 07:28 PM
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#3
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Senior Member Group: Members Posts: 3534 Joined: 1-October 05 From: Croatia Member No.: 523 |
Yes, that one. It's in the shadow in sol 24 image, but other darker bits are subtly visible and yet this one isn't.
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Jun 19 2008, 08:14 PM
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#4
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 Senior Member Group: Moderator Posts: 2606 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Nice animation!
There is another tiny chunk in the far right of the images (below the furthest right white streak) that is in full sunlight in both images that went away in the second image of the sequence. -Mike -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Jun 19 2008, 08:51 PM
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#5
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Newbie Group: Members Posts: 8 Joined: 4-June 08 Member No.: 4181 |
QUOTE (ugordan @ Jun 19 2008, 07:10 PM) The small white chunk in sol 21 image appears to disappear in sol 24 (inset). yes exactly hortonheardawho from marsroverblog.com found this for sure now . IT is ice http://www.flickr.com/photos/hortonheardaw...881091/sizes/o/ |
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Jun 19 2008, 09:09 PM
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#6
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Member Group: Admin Posts: 466 Joined: 11-February 04 From: USA Member No.: 21 |
Here's my take on the sol 20 - sol 24 changes using the 5 filter (R1ABC2) set from each for comparison. Ugordon's warnings about the brightest features absolutely apply. There might be legitimate changes, but they might also just be overexposure / time-of-day / stretching differences.
The "bright stuff" under the shadow I feel much more confident about: it's there on sol 20, gone by sol 24. 
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Jun 19 2008, 09:20 PM
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#7
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Newbie Group: Members Posts: 8 Joined: 4-June 08 Member No.: 4181 |
good point to obserwation is in this place also
 http://www.flickr.com/photos/hortonheardaw...881091/sizes/o/ |
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Jun 19 2008, 09:25 PM
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#8
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 Senior Member Group: Members Posts: 2738 Joined: 17-January 05 Member No.: 152 |
Beautiful stuff, guys. I agree about the disappearing light bits in the shadow. But the lighting in the latest gifs (slinted, horton) is very similar on sols 20 and 24, as you can see by the shadows. We are again clearly seeing a darkening over time of the larger exposed substrate areas.
How does this sound: White substrate is mostly white ice, plus some dark dust/sand impurities. As the ice sublimates, the impurities are left behind. Eventually, the surface of the substrate is essentially completely covered by the dark impurities. That stage has almost been reached on the leftmost large exposed substrate area - there's very little white left by sol 24. |
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Jun 19 2008, 10:44 PM
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#9
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 Bloggette par Excellence Group: Admin Posts: 3964 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Awesome animation, slinted. That went straight to the blog.
 --Emily -------------------- |
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Jun 20 2008, 12:00 AM
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#10
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 Member Group: Members Posts: 713 Joined: 29-December 05 From: NE Oh, USA Member No.: 627 |
slinted and all...
awesome indeed ... Peter Smith agrees... http://phoenix.lpl.arizona.edu/06_19_pr.php MUST BE ICE!!!! Craig |
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Jun 20 2008, 01:08 AM
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#11
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Member Group: Members Posts: 548 Joined: 19-March 05 From: Princeton, NJ, USA Member No.: 212 |
QUOTE (belleraphon1 @ Jun 20 2008, 01:00 AM) http://phoenix.lpl.arizona.edu/06_19_pr.php MUST BE ICE!!!! "It must be ice," said Phoenix Principal Investigator Peter Smith of the University of Arizona, Tucson. "These little clumps completely disappearing over the course of a few days, that is perfect evidence that it's ice. There had been some question whether the bright material was salt. Salt can't do that." There is also an animation at the UA Phoenix page clearly showing the changes at lower left of Dodo-Goldilocks. Images from Sols 20 and 24 (June 15 and 18, 2008). "These images show sublimation of ice in the trench informally called "Dodo-Goldilocks" over the course of four days". Pay Dirt !! ken |
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Jun 20 2008, 01:09 AM
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#12
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Senior Member Group: Members Posts: 2738 Joined: 17-January 05 Member No.: 152 |
So as far as those disappearing chunks, how did they sublimate so fast? I thought we were talking microns per day of sublimation...
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Jun 20 2008, 01:54 AM
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#13
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Junior Member Group: Members Posts: 73 Joined: 17-May 08 Member No.: 4114 |
That was for ice attached to a large body. A relatively small piece sitting on regolith would behave quite differently.
It also crosses my mind that those "chunks" might be more like shavings than solid blocks. |
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Jun 20 2008, 02:33 AM
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#14
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Senior Member Group: Moderator Posts: 2606 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
I so could not resist this!
 Ice, Ice Baby! EDIT: poignant lyric for today: "If there was a problem yo I'll solve it Check out the hook while my DJ revolves it " -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Jun 20 2008, 03:10 AM
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#15
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 Member Group: Members Posts: 252 Joined: 5-May 05 From: Mississippi (USA) Member No.: 379 |
Media Update
NASA and the University of Arizona, Tucson, will hold a media teleconference at 10 a.m. PDT (1 p.m. EDT) (5 p.m. UTC) on Friday, June 20, to report on the latest news from NASA's Phoenix Mars Lander mission. I wonder what the major topic will be? Jack Note This conference is only posted on the Arizona web page as of 11:00 p.m. EDT. I hope it will be announced on NASA's audio streaming page soon Streaming Page http://www.nasa.gov/news/media/newsaudio/index.htm |
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