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0620.PR
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1993-04-21
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OFFICE OF PUBLIC INFORMATION
JET PROPULSION LABORATORY, CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIFORNIA. TELEPHONE 354-5011
FOR IMMEDIATE RELEASE
(Telephoned to deadline press July 14 1972)
Mariner 9 has completed the photo-mapping of the
entire surface of Mars, the Jet Propulsion Laboratory has
announced.
Final elements needed for a global map were acquired
in the playback of 30 pictures last Monday (July 10), bringing
the total photo count to more than 7100. No more pictures will
be received before mid-October.
Mariner 9, launched May 30, 1971, has been in orbit
around Mars since last November 13, circling the planet twice
each day. The spacecraft will make its 500th circuit of Mars
next Thursday (July 20).
During the next three months, Mariner will provide
precision tracking data to test a relativity theory stating
that electromagnetic radiation -- in this case the spacecraft
radio signal -- passing close to the sun will be slowed by the
sun's gravitational field.
Mars and Earth will be in superior conjunction -- on
opposite sides of the sun -- on September 7. Distance between
the two planets will be about 250 million miles.
-more- R -2-
Additional pictures may be taken during very brief
sequences -- once in August, once in September and twice in
October -- and recorded on board the spacecraft for trans-
mission to Earth in late October. Targets available during
this period include the shrinking North Polar cap, cloud
formations and possible Viking landing sites.
Mars scientists have a keen interest in continuing
operation of the spacecraft until November. July, 1976 -- the
scheduled arrival time at Mars for the first Viking spacecraft
-- and October, 1972, are the same season two Martian years
apart.
Mariner 9's useful lifetime will be determined by its
supply of attitude control gas.
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