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Getting Unstuck in West Valley
Pertinax
post Nov 4 2009, 01:59 PM
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QUOTE (Astro0 @ Nov 4 2009, 08:16 AM) *
This sequence taken on sol1972 (left navcam) between 13:27.17 and 18:26.41 local time shows the movement which I was putting down to the effect of thermal changes on either the soil or vehicle. The alternative suggested above maybe movement of the IDD or wheel tests - not sure about the activity going on through this sol on that afternoon.


Neat catch.

For what it is worth, I'd have to side with thermal changes with the whole rover / soil system. I have at work a DIY mounted webcam that I use for taking daily time-lapse movies (7s/frame at 30 fps) that faces west-northwest. As a result of being very solidly secured in a sturdy cardboard box that itself is very firmly wedged between a large window and an institutional 'radiator', thermal expansion and contraction movements are rather visible through the day, afternoon and evening in particular. I say all of this because the *smooth movement over time* that is shown in the navcam animation is VERY reminiscent of the thermally driven *smooth movements over time* in my own time lapse camera, and at a time when such movements seem likely (the setting of the sun). An argument from a very imperfect analogy sure, but still I feel rather compelling.

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mhoward
post Nov 5 2009, 04:27 PM
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This photo that showed up on NASA/JPL's Flickr page is interesting:

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fredk
post Nov 5 2009, 04:43 PM
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And the surface under the rover looks right, if you compare with the localization in this post.
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briv1016
post Nov 6 2009, 03:02 AM
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New Update:

http://marsrovers.jpl.nasa.gov/mission/sta...ll.html#sol2070

"The engineering team has determined that reformatting the file system portion of flash memory will restore the use of the flash memory for data storage... The project intends to re-format the Flash file system shortly."
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Astro0
post Nov 6 2009, 03:36 AM
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More MIs...Sol2076

Attached Image
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Astro0
post Nov 6 2009, 03:40 AM
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Spirit IDD elbow joint... ...and comparision to Oppy image of same.
Attached Image
Attached Image



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alan
post Nov 6 2009, 04:02 AM
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Any idea when a decision will be made about extricating Spirit?
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sgendreau
post Nov 6 2009, 04:21 AM
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QUOTE (Astro0 @ Nov 5 2009, 07:40 PM) *
Spirit IDD elbow joint... ...and comparision to Oppy image of same.


Is that duct tape? I knew it's used on the Shuttle, but ....
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ElkGroveDan
post Nov 6 2009, 04:58 AM
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QUOTE (Astro0 @ Nov 5 2009, 07:36 PM) *
More MIs...Sol2076

Attached Image

I'd say my six bucks and the other thing are still safe. That thing is touching.


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Astro0
post Nov 6 2009, 05:09 AM
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Touching?
I'm still not sure about that, but it's really close if it isn't.
This image 'appears' to show that there may be a glimmer of light between 'Pointy Rock' and Spirit's underbelly.
Attached Image


Either way, we'll know soon.
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AndyG
post Nov 6 2009, 09:30 AM
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Looking over my glasses, I can "black drop" my finger and thumb together while they're well out of focus and yet not touching - but the logical side of my brain suggests the rock and Spirit must be in contact.
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Ron Hobbs
post Nov 6 2009, 06:50 PM
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There is an interesting article at NatureNews:

Mars rover plans its escape

The article interviews John Callas and is, at best, cautiously optimistic. There is an interesting statement:

"If the rover does remain stationary, there's also the possibility of using Spirit's arm to analyse the soil more closely and to measure the area's seismology."

Does anyone here know how they turn the IDD into a seismometer?
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nprev
post Nov 6 2009, 06:59 PM
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Don't think it'd be the IDD, Ron, but the IMU (inertial measurement unit), which is normally used for navigation & attitude sensing.


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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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fredk
post Nov 6 2009, 07:01 PM
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Thanks for the heads up to that article. I don't think the story means that the IDD would be used for seismology. Oppy has already done some seismometry using its accelerometers. Edit - as nprev just said!

This is another interesting quote:
QUOTE
The panel recommended that the rover project team should try to extract Spirit as soon as possible. Time is of the essence — as winter approaches, power from Spirit's solar panels wanes. "The coming winter could pose a risk to the rover," says Callas.
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Juramike
post Nov 6 2009, 07:36 PM
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Hmmmm. But could you use the IDD for seismometry?

Extend the arm out as far as possible, and use the MI to stare at a patch of distinctive grains.

Any movement of the body of the rover will translate to the extended arm and shift the image. (However, wind and thermal changes might do this too.)


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