ALSEP

Abbrev. for Apollo Lunar Surface Experiments Package. Any of the experimental packages carried to the Moon by Apollos 11–17, set up by the astronauts, and left there to transmit information back to Earth. The content of each package differed, becoming more sophisticated as the program progressed. In the Apollo 17 ALSEP, a central station and thermal generator provided the main power; the experiments included an analysis of any residual atmosphere, detection and measurement of any lunar ejecta and meteorite impacts, measurement of any gravitational anomalies, lunar surface studies, and seismic measurements.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006

References in periodicals archive

After calibration, the DEM accuracy was improved from about 127.3 m to about 48.7 m, compared with the coordinates of LLRR and ALSEP landmarks on the lunar surface.

Caption: Figure 5: Distribution of LLRR and ALSEP on the lunar surface.

Data source Highest point of lunar surface Longitude Latitude Elevation /km CE-1 (Li Chunlai) 158.656[degrees]W 5.441[degrees]N 10.629 LAM-2B-SHAO-cali 158.594[degrees]W 5.469[degrees]N 10.723 LOLA 158.63[degrees]W 5.341[degrees]N 10.792 Data source Lowest point of lunar surface Longitude Latitude Elevation /km CE-1 (Li Chunlai) 172.413[degrees]W 70.368[degrees]S -9.178 LAM-2B-SHAO-cali 148.625[degrees]W 61.375[degrees]S -8.531 LOLA 172.48[degrees]W 70.36[degrees]S -9.129 Data source Max elevation difference /km CE-1 (Li Chunlai) 19.807 LAM-2B-SHAO-cali 19.254 LOLA 19.921 Table 4: LLRR and ALSEP elevation error for different DEMs.

A New Lunar DEM Based on the Calibrated Chang'E-1 Laser Altimeter Data

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