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Spirit Route Map, Small and Large Scales
alan
post Nov 23 2004, 05:25 AM
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A look at where spirit has been. View from sol 149
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Gray
post Nov 23 2004, 01:18 PM
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Thanks alan,
This gives us a very different perspective. It looks like it's going to be a long climb. ohmy.gif
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alan
post Nov 23 2004, 03:27 PM
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Spirit's path from Clovis
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Guest_Sunspot_*
post Nov 23 2004, 07:26 PM
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From space.com:

November 23

Mars Rover Spirit Takes a Brake

Busily surveying the Columbia Hills at Gusev Crater, NASA’s Spirit Mars Exploration Rover continues to suffer a bit of a “brake down.”

Rover drivers at the Jet Propulsion Laboratory (JPL) in Pasadena, California continue to deal with Spirit wheel and brake issues. While surpassing its original warranty, Spirit has intermittently sent information in recent weeks that the brakes on two wheels were not releasing properly when the rover received commands to set a new course.

Recent images relayed by Spirit’s navigation camera show in graphic detail what ground operators are dealing with. A westward view from the robot shows the effects of dragging its right front wheel, explained Leo Bister, Spirit mission manager.

The image shown here was taken on November 19, during Spirit’s 313th day of martian operations as the rover drove backwards for about 98 feet (30 meters) on the day the picture was taken, Bister confirmed to SPACE.com .

This type anomaly has not been observed on the Opportunity rover as it wheels around Endurance Crater on the other side of Mars.

-- Leonard David
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Pando
post Nov 23 2004, 08:15 PM
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I think they are completely wrong in that article. The dynamic braking problem is not the one causing for the wheel to drag through the soil.

The braking problem is related to the relay that locks the wheels during driving so the wheels won't turn or steer (not to be confused with rotating). They identified the issue as a faulty sensor on the relay, and are now ignoring it, so the problem is somewhat solved at this point.

The wheel dragging is a completely different problem. It's the wheel motor that rotates the wheel, and it is causing excessive current draw. The motor or the gears are starting to wear out and so they are dragging the wheel on purpose to spare the motor (or gears) as much as they can.
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OWW
post Nov 23 2004, 08:24 PM
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Correct me if I'm wrong, but isn't this all a bit of recycled 'news'? ( Except the 30 meters bit, didn't know that ). I hope the title should not be taken seriously... It has been three days since Spirit moved. Long weekend this time, or 'broken down'? ohmy.gif
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Guest_Sunspot_*
post Nov 23 2004, 11:31 PM
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I think they're still moving:

21 Nov: http://qt.exploratorium.edu/mars/spirit/fo...00P1110R0M1.JPG

23 Nov:
http://qt.exploratorium.edu/mars/spirit/fo...00P1214R0M1.JPG
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OWW
post Nov 24 2004, 12:03 AM
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Yes they are! Vrooommm vroomm:

http://qt.exploratorium.edu/mars/spirit/re...00P1310L0M1.JPG
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Guest_Sunspot_*
post Nov 24 2004, 12:22 AM
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Nice NavCam image of where we've been:

http://qt.exploratorium.edu/mars/spirit/na...00P0745R0M1.JPG
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alan
post Nov 24 2004, 03:50 AM
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Vroom, vroom is right. New location, view from sol 149
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Pando
post Nov 24 2004, 07:24 AM
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How do you determine that Spirit is at the location marked 316? That seems pretty far away from the ridge and I don't think Spirit has got that far off its path.

I believe we are still close to the centerline on the ridge continuing straight towards Husband Hill...
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alan
post Nov 24 2004, 04:17 PM
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I found spirit's location in a nav cam image fron sol 310

then matched rocks in the panarama from 149
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alan
post Nov 24 2004, 04:34 PM
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From a long time ago and a position far, far away
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alan
post Nov 24 2004, 04:53 PM
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Thats odd, it worked in the preview.
Panorama from sol 149 again, fixed broken link.
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djellison
post Nov 24 2004, 05:08 PM
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QUOTE (alan @ Nov 24 2004, 04:34 PM)
From a long time ago and a position far, far away

NOW it makes sense - if they traversed straight up the ridge - they solar arrays would be orientated WNW. By going to the left edge of that image - then up along near the skyline - they're orientated N / NNW - much better from an energy point of view. Excellent work Alan!
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