Dust Delays Mars Crater Entry

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Dust Delays Mars Crater Entry
Jet Propulsion Laboratory
July 03, 2007

A giant dust storm brewing for more than a week on Mars has become
worse
and is affecting surface operations of the Mars Exploration Rovers,
Spirit and Opportunity. Because the rovers depend on solar energy for
survival, and the dust is partially blocking the sun, the storm is
being
watched closely by the rover scientists and engineers. Opportunity's
entry into Victoria Crater is delayed for at least several days.

The storm, the most severe storm yet to hit the rovers, is expected to
continue for at least another week. Opportunity is perched near "Duck
Bay" as it readies to descend into Victoria Crater, but operations
were
scaled back on Saturday, June 30, to conserve power.

"The storm is affecting both rovers and reducing the power levels on
Opportunity," said John Callas, Mars Exploration Rover project manager
at NASA's Jet Propulsion Laboratory, Pasadena, Calif. "We are keeping
an
eye on this as we go forward, but our entry into Victoria Crater will
be
delayed until no sooner than July 13."

"We have some data that show the atmospheric opacity is decreasing, so
the storm might have peaked and we may have passed the worst of this.
The situation could improve quickly from here, but we will have to
wait
and see," said Callas.

Weather reports from NASA's Mars Reconnaissance Orbiter Mars Color
Imager camera are helping track the storm and plan rover operations.

Pictures from the orbiter's Mars Color Imager show the storm is
regional
in extent, and includes several local areas of especially high dust
activity. The storm has been moving eastward and toward mid-latitudes,
and is now also causing an increase in atmospheric dust at Spirit's
location, on the opposite side of the planet at Gusev Crater. Dust
levels at Gusev remain much lower than at the Opportunity site,
however.

Both rovers take daily measurements estimating the amount of dust in
the
atmosphere. The less dust the better, because it means more sunlight
reaches the rover's solar panels, which power the vehicles. In the
last
week, Opportunity has broken its dust record, with the opacity level
rising from 1.0 to 3.3. Solar array energy on Opportunity dropped from
765 watt-hours to 402 watt-hours over the same period of time.

"While this only represents enough dust to coat the planet to about
the
thickness of a human hair, it is enough to decrease the brightness of
the noon sun by 96 percent compared to a completely clear atmosphere,"
said Steve Squyres, principal investigator, Cornell University,
Ithaca,
N.Y. "Of course, the solar arrays also receive light that is scattered
from the dust, so the decrease in power is not nearly that great."

"We have not seen dust measurements this high on either rover before.
If
the dust levels were to increase further and stay elevated for several
days, there is a risk to how well Opportunity could continue to work
in
this darkened environment," said Callas.

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Media contact: Guy Webster/JPL
(818) 354-6278