Mars Rovers Examining Hills And Crater In Bonus-Time Mission

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Guy Webster (818) 354-6278
Jet Propulsion Laboratory, Pasadena, Calif.
Donald Savage (202) 358-1547
NASA Headquarters, Washington, D.C.
News Release: 2004-140 June 2, 2004
Rovers Examining Hills And Crater In Bonus-Time Mission
More than a month into bonus time after a successful primary mission
on Mars, NASA's Spirit rover has sighted possibly layered rock in
hills just ahead, while twin Opportunity has extended its arm to
pockmarked stones on a crater rim to gather clues of a watery past.
Both robotic geologists of the Mars Exploration Rover Project remain
healthy. Engineers at NASA's Jet Propulsion Laboratory, Pasadena,
Calif., quickly restored Spirit from two unexpected computer reboots
in May triggered by low-probability software glitches. "We had bad
luck to hit two very unlikely scenarios just eight days apart, but in
both cases the software team was able to figure out the problem within
a day," said Joe Snyder, a Lockheed Martin software engineer on JPL's
rover team.
Spirit has driven more than 2.9 kilometers (1.8 miles) since arriving
at Mars five months ago, more than three-fourths of that since
completing its three-month primary mission. It now has only about 400
meters (440 yards) to go -- possibly less than a week of driving --
before reaching the base of a range of hills informally named
"Columbia Hills," which scientists identified in January as a
desirable but potentially unreachable destination for the rover.
"This is the first time we've ever had a close look at hills on Mars,"
said Dr. James Rice of Arizona State University, Tempe, a member of
the rovers' science team. In 1997, hills called "Twin Peaks"
tantalized scientists from only about one kilometer (1,100 yards) away
from the Mars Pathfinder landing site. "We could only observe Twin
Peaks from a distance and wonder about them, but now with a more
capable rover we can get to Columbia Hills," Rice said. He spoke at a
press briefing today at JPL.
Rocks in Columbia Hills may provide insight both into both how hills
form on Mars and whether the ancient environment at this part of Mars
was wet. Images Spirit has taken as it nears the hills already show
boulders and potential rock outcrops. "These rocks are much older
than what we've been driving across," Rice said. "We could find a lot
of geological history locked in them. They may be some of the oldest
material ever seen on Mars."
On the rim of stadium-sized "Endurance Crater," halfway around Mars
from Spirit, Opportunity has been using its microscopic imager to
examine the texture of rocks, adding information about a past lake or
sea environment that also left its mark in the smaller crater,
"Eagle," where Opportunity landed.
"We're looking at rocks that have very interesting surface textures,"
said science-team member Dr. Wendy Calvin of the University of Nevada,
Reno. "These rocks appear to be from the same geological layer as the
outcrop at Eagle Crater, but they have some differences from what we
saw there." One rock called "Pyrrho" on the Endurance rim has a
braided ripple pattern. Another, "Diogenes," compared with rocks seen
earlier, has more of the disc-shaped cavities that scientists
interpret as sites where crystals formed in the rocks, then
disappeared as the chemistry of water in the rocks varied.
From an overlook point on the southeastern edge of Endurance,
Opportunity used its panoramic camera and miniature thermal emission
spectrometer to study the inside of the crater, supplementing a
similar survey made earlier from the western edge. Both instruments
can be used to assess mineral composition from a distance. "We see a
strong basaltic character in the sand at the bottom and in some of the
rocks in the wall of the crater," Calvin said. That is a contrast to
the sulfate-rich composition of the overlying layer, which resembles
the Eagle Crater outcrop. "We expect the basaltic material to tell us
about environmental conditions from an earlier time," she said.
Scientists and engineers are evaluating the potential science benefits
of sending Opportunity into Endurance Crater and assessing whether the
rover would be able to climb back out. A decision about whether to
enter the crater will be based on those factors.
Mission controllers have begun frequent use of a "deep sleep" mode for
Opportunity, reported JPL's Matt Wallace, mission manager. It is a
more complete overnight shutdown that conserves energy but at a
calculated tradeoff of risking damage to the miniature thermal
emission spectrometer. The strategy has approximately tripled the
amount of time the solar-powered rover can work during the day. So
far, the spectrometer has survived, but as the martian winter
advances, scientists expect to lose the use of that instrument.
JPL, a division of the California Institute of Technology in Pasadena,
manages the Mars Exploration Rover project for NASA's Office of Space
Science, Washington, D.C. Images and additional information about the
project are available from JPL at
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and from Cornell University, Ithaca, N.Y., at
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.

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