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0352.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 SATURDAY, AUGUST 21, 1965
An attempt to take pictures of empty, black space with
Mariner IV's television camera was scrubbed today after the trans-
mission of the first of a series of commands from Earth, the Na-
tional Aeronautics and Space Admnistration and the Jet Propulsion
Laboratory reported.
Project officials at JPL said the sequence--designed to
obtain picture calibration information to help in the analysis of
the Mariner IV pictures of Mars--was halted when a communications
problem arose.
The first command, which set in motion the scan platform
upon which the TV camera is mounted, was transmitted from the
Goldstone, Calif., Station of the Deep Space Network at 3:22 p.m.
Pacific Daylight Time.
Three additional ground commands returned the space-
craft to its cruise mode after it was realized that a problem
existed. It was not immediately known whether the communications
difficulty was in the spacecraft or in ground equipment.
The sequence was rescheduled for next Thursday. The
pictures of space will be recorded on the first track of the tape
which stored the Mars pictures last July 14 when Mariner IV flew
by the planet at an altitude of 6118 miles. The spacecraft will
transmit to Earth five full pictures of black space.
If the sequence had been completed Saturday, it is
possible that a first magnitude star, Altair, may have been
-2-
photographed since it was in the field of view of the camera.
The star will not be visible to Mariner IV Thursday.
The possibility of obtaining a picture of Altair was
considered interesting, but is not a major objective of the
calibration sequence.
Mariner has flown 266 days since launch November 28,
1964. It is now more than 164 million miles from Earth, nine
million miles from Mars and has travelled more than 370 million
miles in its orbit around the sun.
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352-8/21/65