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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
MARINER CAMERA COVERAGE
Shortly after 5:00 p.m. PDT on July 14, 1965, close-up
pictures of Mars will be taken by the Mariner IV spacecraft.
During a 25 minute picture-taking interval a total of 21 frames
will be exposed and recorded aboard the magnetic tape. The pic-
tures will be telemetered back to Earth, bit by bit, over the
next 10 days. The final pictures will be taken near or in the
shadowed half of Mars and it is not possible at this time to de-
termine if the final few pictures might be too dark to be usable.
It is planned to position the television camera for a
few hours prior to encounter by stopping the scan platform at a
predetermined angle. If this is successful, the first two pic-
tures will cover a part of the brightest of Martian deserts,
Elysium, and an unusual maria region, Trivium Charontis. This
region is unique in that it has been recently discovered to be a
strong radar backscatterer; that is, the region reflects radar
waves as a mirror reflects light. The television camera will
then sweep southward across the desert Zephyria and into Mare
Cimmerium. Farther south over the desert Electris, an atmo-
spheric haze which surrounds the polar cap at this time of the
Martian year will be encountered. It is hoped that the camera
will cut through this haze sufficiently to allow observation of
the edge of the polar cap at 55 degrees south latitude. The TV
scan will continue, now in a southeasterly direction, across the
sunset terminator south of Aonius Sinus in the polar cap.
-2-
The spacecraft will be at an altitude of 7000 miles for
the first pictures, moving southeastward at 180?o\ east longitude,
40?o\ south latitude. The ground resolution will be best near the
middle of the television pass where the camera will be pointed
almost straight down. In this region each picture will cover a
surface area 120 by 120 miles, and it will be possible to resolve
prominent surface markings as small as two miles across.
-0-
#339--6/22/65