A possible meteor shower on the moon

Details A possible meteor shower on the moon A possible meteor shower on the moon

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.2101h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Nov. 1991, p. 2101-2104. Research supported by Research Corp.-Whitaker F

Physics

27

Lunar Atmosphere, Meteoroid Dust Clouds, Meteoroid Showers, Sodium, Solar Orbits, Solar System

Scientific paper

Over the 3-day period from 12 to 14 October, 1990, the sodium abundance in the lunar atmosphere at 80 deg South increased by 60 percent, while interspersed measurements at the equator showed no substantial change. The source is suggested to be an unknown meteor shower with a radiant near the south ecliptic pole. A low relative velocity of about 20 km/sec, combined with small particle masses, would keep the shower below the detectability threshold of radar. The stream could evolve from a reasonable asteroidal or cometary orbit with a perihelion somewhat greater than 1 AU and a major axis of a few AU. The short residence time of lunar sodium makes it much more favorable than the terrestrial sodium layer for the detection of such an event.

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