Apollo Guide
Apollo 11 Landing Site
Laser Ranging Retro-Reflector (LRRR)
This passive experiment consisted of an array of 100 fused silica cubes on Apollo 11, arranged to reflect a beam of light back on a parallel path to its origin. The LRRR placed on the Moon was aligned precisely so that it faced the Earth. Scientists from around the world directed laser beams at the instrument which reflected them back to Earth; the elapsed time for the round trip allowed precise measurements of distances, down to an accuracy of 8 centimeters, between the Earth and the Moon.
This instrument contained four seismometers powered by two panels of solar cells, which converted solar energy into electricity. It used three long-period seismometers and one short- period vertical seismometer for measuring meteorite impacts and moonquakes, recording about 100 to 200 hits by meteorites during its lifetime.
Data regarding the strength, duration, and approximate direction of the seismic event were relayed to tracking stations on Earth. Because it was only powered by solar cells, the experiment only operated during the lunar days.
Non - Normal
Contingent EVA 2 - One Man , Two Hours
Description and Rationale
A second contingent EVA timeline is presented for a situation where only one crewman will egress .* The use of this EVA timeline , as for the other contingent timeline , will require a real time decision . All of the reasons , or even if one would be cons idered in real time , have not yet been determined . One reason might be the failure of one PLSS to check out . Another might be a LM subsystem malfunction which required continuous monitoring . Other suppos itions could require a decision to conduct a one man EVA.
As for Contingent EVA 1, it is assumed that the CDR can egress . However , if this is not possible , each crewman should be capable of accomplishing the other crewman 's tasks .
For this contingent situation the crewman on the surface should be able to accomplish most of the nominal activities within two hours . He may , however , require verbal assistance from the other crewman as well as more time to perform the tasks which he nominally does not perform.
* The Final Flight Mission Rules for Apollo 11 will govern the selection of the crewman to egress and the EVA he will accomplish.
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