Cratering asymmetry on the Moon: New insight from the Apollo Passive Seismic Experiment

Physics

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Planetary Sciences: Solar System Objects: Moon (1221)

Scientific paper

The synchronous rotation of the Moon can lead to an asymmetry in the cratering rate between the leading and trailing sides of lunar orbital motion. The observation of the Apollo Passive Seismic Experiment can be viewed as a continuous seismic observation of lunar impacts; it provides information of the current bombardments and small impact events of meter-sized craters. To evaluate the current leading-trailing cratering asymmetry on the Moon, we investigated the spatial distribution of impact sites determined by Apollo seismic observation. We determined that the number density of impacts on the leading side is substantially higher than that on the trailing side. In addition, we discovered a possible enhancement of the number density of 1.4 ± 0.4 to 1.9 ± 0.5 on the leading side relative to that of the trailing side. This indicated that the cratering asymmetry predicted from historical cratering records also exists in the current low-magnitude impacts.

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