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1993-04-21
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OFFICE OF PUBLIC EDUCATION AND INFORMATION
JET PROPULSION LABORATORY, CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIFORNIA. TELEPHONE 354-5011
FOR IMMEDIATE RELEASE
PASADENA, Calif., Dec. 7, 1964 -- Telemetry from the
Mariner IV spacecraft, now en route across interplanetary space
to the planet Mars, indicates that one of its eight experiments
has ceased to function.
Engineers at the Jet Propulsion Laboratory said the
instrument -- the solar plasma experiment -- began operating only
intermittently yesterday. No useful data was received from the
instrument since early today. Project officials analyzing the
problem have not discounted the possibility of recovery of the
instrument.
JPL also reported that the Mariner IV temporarily lost
its lock on the star Canopus at 4:30 a.m. PST today and went into
its programmed roll search for the star. Loss of lock on Canopus
does not alter Mariner's course.
When the spacecraft's Canopus tracker lost lock with the
Star, Mariner rolled 342 degrees in 44 minutes, stopping at another
bright star, Gamma-Vela. Project officials plan to command the
spacecraft to reacquire Canopus sometime in the near future.
Current analysis supports the theory that a dust
particle, reflecting the light of the sun, passed through the
field of view of the Canopus tracker. According to project
officials, a dust particle no larger than .005-inch, passing
within 2 feet of the sensor, could have triggered the loss of
lock on Canopus.
-2-
For 8 days, the solar plasma probe functioned
perfectly, measuring and transmitting to Earth the density,
velocities, temperatures and direction of low energy prot∩3∩outward
from the Sun at supersonic speeds to form what has
btermed the "solar wind."
This is the first time that such measurements have been
made in interplanetary space farther from the Sun than the orbit
of Earth.
Breakdown of the plasma probe has not affected other
instruments or spacecraft subsystems.
Five other scientific instruments aboard the Mariner IV
are functioning normally. Two additional experiments will be
conducted in the vicinity of Mars next July.
Mariner IV performed a mid-course maneuver Saturday,
seven days after launch from Cape Kennedy. The post-maneuver
trajectory data are now being analyzed to determine precisely the
new path of the spacecraft.
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305 - 12/7/64