Mars Exploration Rovers Update - October 21, 2005

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

SPIRIT UPDATE: Spirit Begins Downhill Drive - sol 634-640, Oct 21,
2005:

Spirit is healthy and has begun driving downhill from the top of
"Husband Hill" toward the south basin. Elevation maps produced from the
panoramic camera imagery taken at and near the summit of Husband Hill
showed a safe traverse (with vehicle tilts under about 20 degrees)
across ridge lines east of the summit. These ridge lines (informally
called "Haskin upper ridge" and "Haskin east ridge") are the planned
traverse paths for coming weeks. When possible, Spirit will drive each
day.

Sol-by-sol summaries:

Sol 634 (Oct. 15, 2005): Spirit finished investigating a rock outcrop
called "Hillary" near the summit of Husband Hill. Spirit used the alpha
particle X-ray spectrometer and the microscopic imager to study
Hillary,
then Spirit stowed the robotic arm. Spirit bumped back about 2 meters
(7
feet) from the outcrop to complete remote imaging. Spirit used the
miniature thermal emission spectrometer and panoramic camera to study
targets on Hillary.

Sol 635: Spirit drove 47 meters (154 feet) east from the summit.

Sol 636: Spirit took images with the navigation camera and performed
atmospheric observations.

Sol 637: Spirit drove 20 meters (66 feet) during the first of a series
of drives toward Haskin upper ridge. There is an apparent drop-off near
this ridge; therefore, each drive begins with a short 10-meter
(33-foot)
"blind" drive, followed by drives using hazard-avoidance cameras and
decreased limits on how far the rover can tilt in any direction. The
intent is to stop a drive short of any significant change in local
elevation.

Sol 638: Spirit drove 29 meters (95 feet) during the second drive to
the
Haskin upper ridge. Spirit also observed the moons Phobos and Deimos at
night.

Sol 639: Spirit covered 17 meters (56 feet) during the third drive of
the approach to Haskin upper ridge. This left Spirit about 15 meters
(49
feet) from the drop-off and near an area with rock outcrops.

Sol 640: Spirit's planned activities for sol 640 were devoted to remote
sensing of the east basin, expected to be within view after the third
leg of the sol 639 drive.

As of the end of sol 639, (Oct. 20, 2005), Spirit has driven 5,107
meters (3.17 miles).

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OPPORTUNITY UPDATE: Maneuvering Around Ripples - sol 613-618, Oct 21,
2005:

Opportunity is healthy and has been making excellent progress around
"Erebus Crater." At the beginning of the week, the rover was in
automode
as it was still recovering from a partial uplink, but on sol 614 the
team sent a real-time activate command and the rover performed remote
sensing. The team is no longer operating under restricted sols, and
Opportunity traveled 101.65 meters (333 feet) in four sols. The rover
is
generally heading westward around the crater, but traveled northward on
sol 618 to avoid some larger ripples to the west.

Sol-by-sol summaries:

Sol 613 (Oct. 14, 2005): The team planned untargeted remote sensing.
However, the master sequence did not run because Opportunity was in
automode.

Sol 614: The team sent a real-time command to activate the sol 614
master sequence. The plan included remote sensing.

Sol 615: Opportunity completed an 18.5-meter (61-foot) drive heading
westward around Erebus Crater.

Sol 616: Opportunity drove 24 meters (79 feet), with an average slip of
2.3 percent.

Sol 617: The rover completed a 43.65-meter (143-foot) drive, zigzagging
around low points in the ripples.

Sol 618: Opportunity completed a 15.5-meter (51-foot) drive on outcrop,
heading northward to find some lower ripples to cross.

As of sol 618 (Oct. 19, 2005) Opportunity has driven 6,138.07 meters
(3.81 miles).