http://marsrovers.jpl.nasa.gov/mission/status.html

SPIRIT UPDATE: Bye-Bye 'Bonneville' - sol 87, Apr 02, 2004

Spirit began sol 87, which ended at 3:00 p.m. PST on April 1, 
with some morning atmospheric science, and then took a last 
look at the rock "Mazatzal" with the panoramic and navigation 
cameras. Then the rover was off, traveling 36.5 meters 
(119.8 feet) down the side of "Bonneville" Crater headed 
south toward the "Columbia Hills."

The drive was a combination of "blind" and autonomous 
navigation roving. The blind segments of the drive are used 
when rover planners can see all possible hazards and command 
the rover to just "go." The autonomous navigation portion 
allows the rover to make decisions based on the terrain 
presented. While the blind segments of the sol 87 drive were 
successful, the second to the last autonomous navigation 
sequence did not complete in the allotted time, causing a 
drive "goal" error. As a result, Spirit was not able to 
execute the complete commanded drive, and roved 36.5 meters 
(119.8 feet) of the 65-meter (213.3 feet) planned drive.

Following the drive, Spirit took navigation and panoramic 
camera pictures in her drive direction and performed 
atmospheric and soil science with the panoramic camera and 
mini thermal emission spectrometer.

Spirit will spend most of sol 88, which ends at 
3:39 p.m. PST on April 2, driving toward the Columbia Hills.



OPPORTUNITY UPDATE: 'Bounce' Barraged by Instruments - sol 67, 
Apr 02, 2004

In recognition of changing the instruments on its arm nine 
times, David Bowie's "Changes" woke Opportunity on its 67th 
sol on Mars, which ended at 3:21 a.m. PST on April 2.

The rover continued to examine "Bounce" with the microscopic 
imager and the Moessbauer and alpha particle X-ray 
spectrometers.

During the martian morning, the Moessbauer spectrometer was 
turned off before atmospheric science was conducted with 
the miniature thermal emission spectrometer and the 
panoramic camera.

The afternoon hours were dedicated to intensive study of a 
handful of targets on Bounce, including the impression 
ground by the rock abrasion tool on sol 66.

Opportunity will continue to investigate Bounce for the 
next two sols and then begin its journey toward 
"Endurance Crater."


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