Sol 22 and after, Digging in Wonderland |
  |
Sol 22 and after, Digging in Wonderland |
 Jun 23 2008, 04:53 PM
Post
#61
|
|
 The Poet Dude  Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60  |
Sol 28 images are going up...
-------------------- |
 |
 
|
|
Jun 23 2008, 05:45 PM
Post
#62
|
|
 Senior Member Group: Members Posts: 4247 Joined: 17-January 05 Member No.: 152 |
The main ice exposure at the far end of Dodo/Goldilocks is continuing to darken:
http://www.met.tamu.edu/mars/i/SS028EFF898...5_132F0L1M1.jpg It's easy to predict that the entire exposure will be dark in not too many sols. I'm intrigued by the fact that the darkened ice surface is actually darker than the surrounding soil, as I've mentioned before. I wonder how Holy Cow is doing. This rapid darkening helps illustrate why we see no naturally exposed ice patches around (indeed, perhaps we should be looking for unusually dark, rather than light, areas!). Perhaps it also explains why we saw nothing bright in the heatshield crater (although that may have involved dark debris from the heatshield itself). |
|
|
|
|
Jun 23 2008, 06:02 PM
Post
#63
|
|
|
Member Group: Members Posts: 242 Joined: 17-February 04 From: Ohio, USA Member No.: 34 |
That's a neat observation - that the lighter toned, presumably icy, patches become darker over time. This is, perhaps, due to the sublimation of an ice/soil mixture which leaves a soil residuum when the ice sublimates. But, what causes the darker tone, and should we expect the darker area to become lighter-toned with time? That is will the darker toned areas eventually attain a tone which is similar to the surrounding soil?
|
|
|
|
|
Jun 23 2008, 06:02 PM
Post
#64
|
|
 Senior Member Group: Members Posts: 1632 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Just a reminder that if the color becomes darker than the surrounding soil, one possibility might be a wetting effect due to brief melting in the sunlight? Perhaps there are other possible mechanisms as well as Gray mentions.
Also we apparently see some very isolated naturally exposed ice patches in some orbiter images of the general landing zone, as mentioned in another thread. http://www.unmannedspaceflight.com/index.p...st&p=118986 Steve |
|
|
|
|
Jun 23 2008, 06:19 PM
Post
#65
|
|
 Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Is this an expected amount of dust accumulation on the magnets after 28 sols?
 I seem to remember the rovers' calibration targets staying cleaner than this, but I might be mistaken. -------------------- |
|
|
|
|
Jun 23 2008, 06:27 PM
Post
#66
|
|
|
Member Group: Members Posts: 194 Joined: 8-February 04 Member No.: 10 |
Many of the Phoenix color image sequences are captured over enough time to cause the shadows to change between RGB exposures and thus appear noticably misaligned. Is this because the RGB components can't be made in a rapid sequence? The edges of rocks and shadows will suffer from color fringing across otherwise excellent color panoramas unless attantion is paid to this. Similar products from other recent surface cameras seem to have little of this problem.
|
|
|
|
|
Jun 23 2008, 08:36 PM
Post
#67
|
||
|
The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Interesting rocks here...
-------------------- |
|
|
|
|
|
|
Jun 23 2008, 09:24 PM
Post
#68
|
||
 Member Group: Members Posts: 568 Joined: 20-April 05 From: Silesia Member No.: 299 |
Sol 28 - Peter Pan finished (Az: 90 - 130)
-------------------- Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html |
|
|
|
|
|
|
Jun 23 2008, 09:31 PM
Post
#69
|
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
QUOTE (DDAVIS @ Jun 23 2008, 08:27 PM)  Similar products from other recent surface cameras seem to have little of this problem. This issue is present in MER imagery as well. Given automatic exposure adjustment, filter changing time, frame compression times with slow (by modern PC standards) flight computers, a couple of minutes can easily pass between consecutive frames. This is enough to make long shadows move over 3 exposures. -------------------- |
|
|
|
|
Jun 24 2008, 12:56 AM
Post
#70
|
|
|
Newbie Group: Members Posts: 14 Joined: 20-June 08 Member No.: 4222 |
QUOTE (Stu @ Jun 23 2008, 08:53 AM) Sol 28 images are going up... Is that soil hanging from the edge of the scoop? Now what would cause that? Moisture? Static cling seems unlikely. |
|
|
|
|
Jun 24 2008, 12:59 AM
Post
#71
|
|
 Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
QUOTE (ZenDraken @ Jun 23 2008, 07:56 PM) Is that soil hanging from the edge of the scoop? Now what would cause that? Moisture? Static cling seems unlikely. I'd go with electrostatics. -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
|
|
|
|
|
Jun 24 2008, 01:34 AM
Post
#72
|
|
 Member Group: Members Posts: 691 Joined: 21-December 07 From: Clatskanie, Oregon Member No.: 3988 |
QUOTE (ZenDraken @ Jun 23 2008, 04:56 PM) Is that soil hanging from the edge of the scoop? Now what would cause that? Moisture? Static cling seems unlikely. The soil is not "hanging" from the scoop. The blade is just bleeded out by sunlight. |
|
|
|
|
Jun 24 2008, 03:08 AM
Post
#73
|
|
|
Senior Member Group: Members Posts: 4247 Joined: 17-January 05 Member No.: 152 |
That soil is neither hanging off the edge of the scoop, nor are we seeing ccd bleeding. In this image we can see that the true bottom edge of the scoop is below the apparent bottom in that original image:
http://phoenix.lpl.arizona.edu/images/gallery/lg_7298.jpg Also see this image: http://planetary.s3.amazonaws.com/data/pho...5_131D0MBM1.jpg |
|
|
|
|
Jun 24 2008, 03:23 AM
Post
#74
|
|
|
Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Ahhhh! Thanks for illuminating that!
(I pull back my electrostatic comment) -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
|
|
|
|
|
Jun 24 2008, 05:19 AM
Post
#75
|
|
|
Newbie Group: Members Posts: 14 Joined: 20-June 08 Member No.: 4222 |
QUOTE (fredk @ Jun 23 2008, 07:08 PM) That soil is neither hanging off the edge of the scoop, nor are we seeing ccd bleeding. In this image we can see that the true bottom edge of the scoop is below the apparent bottom in that original image: http://phoenix.lpl.arizona.edu/images/gallery/lg_7298.jpg Also see this image: http://planetary.s3.amazonaws.com/data/pho...5_131D0MBM1.jpg Thanks, I feel slightly less stupid now! |
|
|
|
|
|
Lo-Fi Version | Time is now: 5th May 2024 - 09:37 PM |
|
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. |
|
