By L. J. Kosofsky and Farouk El-Baz, NASA SP-200, 1970
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THE PROGRAM
The Lunar Orbiter program was conceived, together with the Ranger and Surveyor programs, with the primary objective of providing information essential for a successful manned Apollo lunar landing. The Lunar Orbiter program comprised five missions, all of which were successful. As the primary objectives for the Apollo program were essentially accomplished on completion of the third mission, the fourth and fifth missions were devoted largely to broader, scientific objectivesphotography of the entire lunar nearside during Mission IV and photography of 36 areas of particular scientific interest on the nearside during Mission V. Photography of the farside during the five missions resulted in an accumulated coverage of more than 99 percent of that hemisphere. The detail visible in the farside coverage generally exceeds that previously attained by Earth-based photographs of the nearside; in some areas objects as small as 30 meters are detectable.
Initiated in early 1964, the Lunar Orbiter program included the design, development, and utilization of a complex automated spacecraft technology to support the acquisition of detailed photographs of the lunar surface from circumlunar orbit. The five spacecraft were launched at 3-month intervals between August 10, 1966, and August 1, 1967.
In addition to its photographic accomplishments, the program provided information on the size and shape of the Moon and the major irregularities of its gravitational field. This selenodetic information was derived from the tracking data. Micrometeoroid and radiation detectors, mounted on the spacecraft for operational purposes, monitored those aspects of the lunar environment.
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