Apollo 11 Laser Ranging Retro-Reflector: Initial Measurements from the McDonald Observatory

Details Apollo 11 Laser Ranging Retro-Reflector: Initial Measurements from the McDonald Observatory Apollo 11 Laser Ranging Retro-Reflector: Initial Measurements from the McDonald Observatory

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..368a&link_type=abstract

Science, Volume 167, Issue 3917, pp. 368-370

Computer Science

Performance

7

Scientific paper

Acquisition measurements of the round-trip travel time of light, from the McDonald Observatory to the Laser Ranging Retro-Reflector deployed on the moon by the Apollo 11 astronauts, were made on 20 August and on 3, 4, and 22 September 1969. The uncertainty in the round-trip travel time was ± 15 nanoseconds, with the pulsed ruby laser and timing system used for the acquisition. The uncertainty in later measurements of a planned long-term sequence from this observatory is expected to be an order of magnitude smaller. The successful performance of the retro-reflector at several angles of solar illumination, as well as during and after a lunar night, confirms the prediction of thermal design analyses.

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