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NSSDCA ID: 1967-041A-02

Mission Name: Lunar Orbiter 4
Principal Investigator:Dr. William H. Michael, Jr.


The instrumentation for this experiment included a power source, an omnidirectional antenna, and a transponder to obtain information for determining the gravitational field and physical properties of the moon. High-frequency radio signals were received by the spacecraft from earth tracking stations and retransmitted to the stations to provide doppler frequency measurements. The telemetry data were processed in real time on an IBM 7044 computer in conjunction with an IBM 7094 computer. They were then displayed on 100-wpm teletype machines, X-Y plotters, and bulk printers for analysis. Data coverage was continuous while the spacecraft was visible from earth. Information was acquired during the cislunar, the photo ellipse, and the extended mission (from end of the photographic mission to July 11, 1967) phases. Doppler, ranging, hour angle points, and declination angle points data were accumulated during tracking. The quality of recorded data ranged from good to excellent.

Alternate Names

  • LunarOrbiter4/Selenodesy

Funding Agency

  • NASA-Office of Space Science Applications (United States)


  • Planetary Science: Geology and Geophysics

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. William H. Michael, Jr.Principal InvestigatorNASA Langley Research Center
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