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ZL2VAL > ROVERS 06.04.05 13:10l 116 Lines 5689 Bytes #999 (0) @ WW
BID : ROVERS050405
Read: GUEST DL1DVE
Subj: Mars rovers overtime approved
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Sent: 050406/1043Z @:ZL2AB.#46.NZL.OC #:60198 [New Plymouth] FBB7.00g
From: ZL2VAL@ZL2AB.#46.NZL.OC
To : ROVERS@WW
NEWS RELEASE: 05-091
April 05, 2005
Durable Mars Rovers Sent Into Third Overtime Period
NASA has approved up to 18 more months of operations for Spirit and
Opportunity, the twin Mars rovers that have already surprised engineers
and scientists by continuing active exploration for more than 14 months.
"The rovers have proven their value with major discoveries about ancient
watery environments on Mars that might have harbored life," said Dr. Ghassem
Asrar, deputy associate administrator for NASA's Science Mission Directorate.
"We are extending their mission through September 2006 to take advantage of
having such capable resources still healthy and in excellent position to
continue their adventures."
The rovers have already completed 11 months of extensions on top of their
successful three-month prime missions. "We now have to make long-term
plans for the vehicles because they may be around for quite a while," said
Jim Erickson, rover project manager at NASA's Jet Propulsion Laboratory,
Pasadena, Calif.
Erickson cautioned though, "Either mission could end tomorrow with a
random part failure. With the rovers already performing well beyond their
original design lifetimes, having a part wear out and disable a rover is a
distinct possibility at any time. But right now, both rovers are in amazingly
good shape. We're going to work them hard to get as much benefit from them
as we can, for as long as they are capable of producing worthwhile science
results."
"Spirit and Opportunity are approaching targets that a year ago seemed
well out of reach," said Doug McCuistion, director of NASA's Mars
Exploration Program.
"Their successes strengthen NASA's commitment to a vision with the
ambitious targets of returning samples from Mars and sending human
explorers to Mars."
Opportunity is within a few football fields' length of a region called
"Etched Terrain," where scientists hope to find rocks exposed by gentle
wind erosion rather than by disruptive cratering impacts, and rocks from
a different time in Mars' history than any examined so far.
"This is a journey into the unknown, to something completely new," said
Dr. Steve Squyres of Cornell University, Ithaca, N.Y., principal
investigator for the rover's science instruments.
To reach the Etched Terrain, rover planners have been pushing the rover
fast. Opportunity has overtaken Spirit in total distance driven. It has rolled
more than three miles -- eight times the original goal. On March 20,
Opportunity also set a new martian record of 722 feet in a single day's
drive. Drive-distance estimates can vary by a few percent. The long drives
take advantage of crossing a plain so smooth it's "like an East Coast
beach," said JPL's Jeff Favretto, mission manager on the Opportunity shift
in recent weeks. Also, Opportunity's solar panels, though now dustier than
Spirit's, still generate enough power to allow driving for more than three
hours on some days.
Spirit is in much rougher terrain than Opportunity, climbing a rocky
slope toward the top of "Husband Hill." However, with a boost in power
from wind cleaning its solar panels on March 9 and with its formerly balky
right-front wheel now working normally, Spirit made some longer one-day
drives last week than it had for months. "We've doubled our power," said
JPL's Emily Eelkema, mission manager. "It has given us extra hours of
operations every day, so we can drive longer and we've used more time for
observations."
The jump in power output has taken some urgency out of Spirit's southward
climb. With Mars now beginning southern-hemisphere spring, the sun is
farther south in the sky each day. If not for panel-cleaning, Spirit might
be facing the prospect of becoming critically short of power if still on
the north-facing slope by early June.
"We still want to get to the summit of Husband Hill and then head down into
the 'Inner Basin' on the other side," Squyres said. "But now we have more
flexibility in how we carry out the plan. Before, it was climb or die."
Cresting the hill is now not as crucial for solar energy, but it still
offers allures of potential exposures of rock layers not yet examined, plus
a vista of surrounding terrain. In orbital images, the Inner Basin farther
south appears to have terracing that hints of layered rock.
Both rovers do have some signs of wear and exposure. Spirit's rock
abrasion tool shows indications that its grinding teeth might be worn away
after exposing the interiors of five times more rock targets than its
design goal of three rocks. Researchers probably won't know the extent
of wear until Spirit's next rock-grinding attempt, which may be weeks away.
Also, troubleshooting continues for determining whether Opportunity's
miniature thermal emission spectrometer is still usable despite tests
indicating a problem last month. All other instruments on both rovers are
still working normally.
For more information about the rovers and their discoveries on the
Internet, visit:
http://www.nasa.gov/vision/universe/solarsystem/mer_main.html
-=###=-
73, Alan
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Dear Abby letters best left unanswered
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Dear Abby,
I was married to Bill for three months and I didn't know he drank until the
night he came home sober.
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