On the Cometary Origin of the Lunar Ice

Details On the Cometary Origin of the Lunar Ice On the Cometary Origin of the Lunar Ice

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sosyr..33..400s&link_type=abstract

Solar System Research, vol. 33, p. 400 (1999)

Physics

4

Scientific paper

The most effective source of the production and accumulation of lunar polar ice, probably are comets. The young comets, which pass through the perihelion for the first time, actually take part in the processes of high-velocity impacts. These bodies are characterized by a large size and a low nucleus density (down to 0.10 g/sm3 and below), in addition to high orbital velocities in the vicinity of the perihelion. The parameters of the impact process during the fall of an impactor with a low density at a high velocity correspond to the same parameters during the fall of a denser body with a smaller velocity. When calculating the portion of the impactor material remaining on the Moon in the process of the adiabatic expansion and dissipation of the cloud produced by the impact, the elements of the model developed by Yakovlev et al. (1987) are used. According to these calculations, about 6 x 104 short-period comets with average statistical characteristics or 300 giant comets of the Hale on the basis of the results obtained by the Lunar Prospector artificial lunar satellite.

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