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S-band transponder experimentThe experiment which derives data from three lunar-orbiting objects, the command-service module (CSM), the lunar module (LM), and the subsatellite in the S-band is described. Each provides detailed information on the near-side lunar gravitational field. The primary emphasis is on the low-altitude (20 km) CSM data. The LM data cover a very short time span and are somewhat redundant with the CSM data. The resolution of the high-altitude (100 km) CSM data is not as great as that of the low altitude data. The low-altitude CSM and LM data coverage and the complementary coverage obtained during the Apollo 14 mission are presented. The experiment uses the same technique of gravity determination employed on the Lunar Orbiter, in the data of which the large anomalies called mascons were first observed. The data consist of variations in the spacecraft speed as measured by the Earth-based radio tracking system.
Document ID
Document Type
Sjogren, W. L. (JPL Houston, TX, United States)
Gottlieb, P. (JPL)
Muller, P. M. (JPL)
Wollenhaupt, W. R. (NASA Lyndon B. Johnson Space Center)
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Publication Information
Publication: Apollo 15 Prelim. Sci. Rept.
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

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