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1993-04-23
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PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIFORNIA 9ll09. TELEPHONE (213) 354-5011
FOR IMMEDIATE RELEASE
More than 50,000 photographs of Mars taken by
NASA's
Viking orbiters from l976 through l980 have been processed at
the Jet Propulsion Laboratory.
The last photographs taken by Viking l Orbiter
through
the summer of l980 were processed in late March this year.
The
orbiter, one of two that arrived at Mars in l976, was turned
off
in August l980, after it ran out of attitude control gas.
Viking
2 Orbiter ceased operations in July l978. The Viking l
Lander
continues to return scientific data, including photographs,
from
the Mars surface. The Viking 2 Lander ceased operating in
April
l980.
The surviving lander, which is beginning its fourth
Martian
year of surface and climate studies, is sending back valuable
imaging, engineering and meteorological data weekly. Jim
Tillman,
of the University of Washington, is computer processing this
science and engineering data. The lander's radio science î
investigations also continue.
A program is currently underway onboard Lander l
which
reconditions each of its four batteries. Barring any
critical
hardware failures, the lander can continue to operate until
Dec.
5, l994.
Scientists at JPL and other research centers across
the
country continue to study the Mars imaging data. Work at JPL
includes mosaicking the orbiter images, and the study of
channels,
volcanoes and tectonic features on the Martian surface.
Results,
reported from analysis of photos and other data, indicate
strong
evidence that surface water exists on Mars in the form of
ground ice.
In addition, the layers in the north polar cap
appear
to hold the key to understanding the climate changes on that
planet as they do on Earth. Finally, the seasonal nature of
Mars
can be noted in cloud forms and motion, volatile migration
from
pole to pole, frost accumulation, and variations in
temperature
and pressure.
The landers were built by Martin Marietta Aerospace
Corp.
in Denver, Colorado. JPL developed and built the orbiters.
Viking l, launched on Aug. 20, l975, arrived atMars
on June l9, l976. The Viking l Lander separated from the
orbiter
and landed in the Chryse Planitia region on Mars on July 20,
l976.
Viking 2 was launched on September 9, l975 and
entered
orbit around Mars on August 7, l976. The Viking 2 Lander
landed
in the Utopia Planitia region of the planet on Sept. 3, l976.
The extended Viking Mission is managed for NASA by
JPL.
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#99l 4/22/82MBM