Mars Exploration Rover Update - January 6, 2005

http://marsrovers.jpl.nasa.gov/mission/status.html
SPIRIT UPDATE: Spirit Celebrates Year Anniversary on Mars - sol 346-352,
January 06, 2005
Spirit landed on Mars one year ago on Jan. 3, 2004, (Pacific Time) and is still healthy and going strong!
On sol 346, Spirit confirmed that it had dumped a potato-shaped rock that had been plaguing Spirit's right rear wheel. Confirmation came by comparison of before and after images from the rear hazard-avoidance camera. The total distance driven on sol 346 was 0.33 meters (1.08 feet).
On sol 347, Spirit observed selected targets with its panoramic camera and miniature thermal emission spectrometer.
On sol 348 took pictures of a target called "Dreaming" with the microscopic imager, and then did a tool change to the alpha particle X-ray spectrometer. Spirit also made some remote-sensing observations of targets with holiday theme names.
On sol 349, Spirit did a tool change to the Mosssbauer spectrometer and made more observations.
On sol 350, the plan was to drive Spirit 5 meters (16 feet) towards the rock named "La Brea." However, the drive achieved less than a meter
(3 feet) due to slippage.
On sol 351, Spirit attempted to drive again. This drive involved a series of rearward and forward arcs to get to more favorable terrain. Most of the slip occurred during the forward arcs. The estimated slip on the rearward arcs was 15 per cent, but the estimated slip on the forward arcs was 39 per cent. The destination, a rock called "Dick Clark," was still about 4.2 meters away (14 feet).
On sol 352, the incomplete drive on the previous sol had left the rover team with a rock of interest right between the rover's front wheels. Spirit examined a target called "Bubbles" with its microscopic imager, then changed tools to the alpha particle X-ray spectrometer. Spirit also made sky observations with its thermal emission spectrometer and panoramic camera. Sol 352 ended on Dec. 29.
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