Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969rspta.264..141m&link_type=abstract
Philosophical Transactions for the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 264, Issue 1150
Astronomy and Astrophysics
Astronomy
Scientific paper
New techniques and instrumentation have been developed for the measurement of lunar surface temperatures. The infrared pyrometer has a resolution of about 10 seconds of arc. Special computing methods permit precise determination of the spots being measured on the lunar surface. A theoretical study has enabled the lunar surface temperature and its variation to be predicted during a lunation and during total eclipses of the Moon for a number of models. These include surfaces of solid rock, porous rock, dust, rubble, and various surfaces overlaid with different depths of dust. Certain areas, like the crater Tycho, appear to have no appreciable insulating layer of dust, although the environs may have some dust cover of indefinite thickness. Looking further to the future, we have calculated the temperature of the lunar surface during and immediately after the landing of the manned vehicle known as the Lunar Excursion Module, or LEM. High temperatures will result from the exhaust flame of the retro-rocket, of some 1500 to 1600 degrees K immediately below the LEM. However, the cooling will be rapid and the astronauts could safely leave the craft 5 or 10 min after set-down.
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