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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 RELEASE: AM's, Monday, November 28, 1966
Mariner IV, launched two years ago today on its historic
Mars photo mission, has flown more than one billion miles in space
and continues to operate properly, reporting its condition to
Earth three times each week.
The National Aeronautics and Space Administration said
the spacecraft, now in its 730th day of flight, has been transmit-
ting data to the Goldstone Space Communications Station in Cali-
fornia across a distance of some 206 million miles.
At 4 p.m. Pacific Standard Time today Mariner IV will
have flown 1,025,082,830 miles since it was launched from Cape
Kennedy on November 28, 1964. It completed its primary mission
on August 2, 1965, after transmitting to Earth 22 pictures of the
Martian surface recorded July 14 when it flew within 6118 miles
of the planet.
By using Goldstone's new high-precision 210-foot-dia-
meter antenna, Mariner Project officials at the Jet Propulsion
Laboratory have been able to monitor periodically many of
Mariner's subsystems and its scientific instruments.
Recent data from the spacecraft, collected by the "210"
and its super-sensitive radio receiver, indicated that the occur-
rence of an intense solar flare last September caused a slight
loss in the total power capability of Mariner's solar panels. The
"class three" solar storm, which raged more than a week and
reached its peak on September 3-4, was detected also by NASA's
-2-
Pioneer VI and VII spacecraft in orbit around the sun and Lunar
Orbiter I, then revolving the moon.
Because the Mariner IV design allowed for a 20 per cent
panel degradation by just such an occurrence, the power loss
caused by the flare--probably less than half that allowed for--is
not expected to jeopardize the continuing performance of the
spacecraft. Mariner was about 116 million miles from the sun when
the flare occurred.
Other information derived from analysis of the telemetry
data indicates that Mariner's attitude control system has a nitro-
gen gas supply capable of keeping it stabilized for more than a
year, and that temperatures and voltages of all systems including
the scientific instruments are as expected.
Having operated continuously for more than 17,000 hours,
the spacecraft is approaching 300 per cent of its 6000-hour mis-
sion design life.
Mariner IV currently is being tracked by the 210-foot
antenna on a time-sharing basis with Pioneer VI which has been in
solar orbit for nearly a year and also is beyond the range of the
Deep Space Network's 85-foot antennas. If Mariner continues to
function until June, 1967, communications with it may be stepped
up. Mariner's orbit will bring it to within 30 million miles of
Earth in September, 1967, when it is planned to attempt several
engineering experiments in addition to receiving interplanetary
science information.
The year 1967 will be one increasing solar activity.
The presence of Mariner IV and Pioneers VI and VII in orbit around
-3-
the sun, in addition to another Mariner enroute to Venus during
the latter half of the year, will provide an unprecedented
opportunity to take scientific advantage of this part of the
11-year solar cycle.
424-11/22/66