Cape York - Northern Havens, Sol 2780 - 2947 |
Cape York - Northern Havens, Sol 2780 - 2947 |
Mar 25 2012, 04:47 AM
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#481
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Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
I cannot see it, could you show exactly where, pls? I've marked the changes in this close up view. I'm now thinking that the lower one is simply a change of shadow on the ground cast by the rock but the one above still looks like a small shift. Nothing else on the same feature moves in this way with the change of sun angle. (has anyone got a pan- or nav- cam view of this rock?) Just looking for something I guess...you know what we UMSF'ers are like |
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Mar 25 2012, 07:42 AM
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#482
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
ok, Astro0, now I see it... personally, I tend to think is another game of light/shadows combined with complex rock structure (you can see similar illusions in other parts of the same rock) but I'm not sure. Deserves high res imagery!
-------------------- I always think before posting! - Marco -
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Mar 25 2012, 06:29 PM
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#483
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Solar System Cartographer Group: Members Posts: 10146 Joined: 5-April 05 From: Canada Member No.: 227 |
I don't see any real change here.
Phil -------------------- ... 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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Mar 25 2012, 06:56 PM
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#484
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
I agree.
But keeners should compare pancam foreground shots over the sols we've been parked - we might see some soil changes due to wind. Here's a subtle example - a dark spot (with windstreaks?) appeared on the corner of the panels sometime before sol 2891: http://qt.exploratorium.edu/mars/opportuni...2M1.JPG?sol2891 It wasn't visible on 2811 - here's a comparison (same L5 filter, very similar lighting): |
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Mar 26 2012, 04:52 PM
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#485
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
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Mar 27 2012, 12:19 AM
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#486
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
... reconstructed the bottom quarter of the image that was missing in the L7 frame (it cranked up the colors in the process....)
-------------------- CLA CLL
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Mar 28 2012, 02:02 PM
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#487
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Member Group: Members Posts: 691 Joined: 21-December 07 From: Clatskanie, Oregon Member No.: 3988 |
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Mar 28 2012, 02:45 PM
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#488
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Member Group: Members Posts: 691 Joined: 21-December 07 From: Clatskanie, Oregon Member No.: 3988 |
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Guest_Oersted_* |
Mar 28 2012, 04:03 PM
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#489
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Guests |
Maybe a whiff too green down in the bottom of the crater, but otherwise a lovely panorama!
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Mar 28 2012, 06:36 PM
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#490
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Solar System Cartographer Group: Members Posts: 10146 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... 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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Mar 28 2012, 11:44 PM
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#491
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
here is another in the latest series of the IDD
(auto-fixed flares/glints ... hmmm... needs more work) -------------------- CLA CLL
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Mar 30 2012, 01:11 AM
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#492
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
Here is another IDD image (march 29 - SOL2906)
This, I think, is usually the bottom of the IDD as it is stowed and used ...it appears to be pretty clean.... -------------------- CLA CLL
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Mar 30 2012, 02:47 PM
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#493
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
Update on the LF wheel movement and explanation for the IDD imaging in the latest update:
QUOTE On Sols 2901, 2904 and 2906..., further imaging of the rover's position and detail imaging of the [MB] on the end of the IDD were performed along with a series of diagnostic robotic arm motions. The IDD moved without any problems. Motor currents and actuator motion were all nominal. Detailed images of the [MB] showed no evidence of any off-nominal contact with the ground. Careful review of the left-front wheel suggests that the wheel might have moved more than one time, although these are very small motions (a few millimeters).
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Mar 30 2012, 11:32 PM
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#494
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Hmm. Curious.
Don't know anything about MER architecture at this level, but uncommanded automatic flight control movements on airplanes can be caused by a wide variety of things. One of these is a bad or noisy position feedback signal, and that's the first thing I'd check. Doesn't seem like there would be any other motion or position sensors feeding the control computer on the MERs that could cause something like this (there are LOTS of these for planes). A more disturbing possiblity is that the servoamplifier's starting to go south. Presumably it would be easier to identify a noisy feedback sensor & use a software filter to mitigate the effects somewhat. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Mar 31 2012, 02:30 AM
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#495
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
I'd've thought that a wheel performing a steering or driving movement without being commanded would be very unlikely, but I also know nothing about the architecture. My thinking was more along the lines of a bit of settling, maybe prompted by an IDD movement or even a wind gust. We are on a pretty good slope here. Maybe the LF wheel was perched on the edge of a miniature cliff, in an unstable position, and finally worked its way down?
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