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18 April 2024 |
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Apollo 11 Laser Ranging Retro-Reflector: Initial Measurements from the McDonald Observatory | | C O Alley
; R F Chang
; D G Curri
; J Mullendore
; S K Poultney
; J D Rayner
; E C Silverberg
; C A Steggerda
; H H Plotkin
; W Williams
; B Warner
; H Richardson
; B Bopp
; | | Date: |
23 Jan 1970 | | Journal: | Science, 167 (3917), 368-370 | | Abstract: | 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. | | Source: | PubMed, pmid17790146 doi: 10.1126/science.167.3917.368 | | Services: | Forum | Review | Favorites | |
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