Rayed craters on the moon and Mercury

Details Rayed craters on the moon and Mercury Rayed craters on the moon and Mercury

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pepi...15..179a&link_type=abstract

(Lunar Science Institute, Conference on Comparisons of Mercury and the Moon, Houston, Tex., Nov. 15-17, 1976.) Physics of the Ea

Physics

3

Craters, Lunar Craters, Lunar Rays, Mercury (Planet), Photogeology, Apollo Flights, Density Distribution, Erosion, Kolmogoroff-Smirnoff Test, Lunar Photographs, Mariner 10 Space Probe, Meteoritic Damage, Photointerpretation

Scientific paper

Systems of bright rays are exhibited by many fresh craters on the moon and Mercury. Diameter/density distributions suggest that lunar-rayed craters represent the Class 1 craters, and that Mercurian rayed craters represent post-Caloris craters. Photogeological analyses of lunar imagery indicate that the ray systems are composed of finely divided material from the primary crater along with locally derived ejecta from secondary and tertiary craters. The primary ray material probably occurs in moderately thick (0.1-1 meter) deposits. The rate of darkening may depend more on the thickness of the ray material than on the rates of various darkening processes. Darkening rate may also be a function of crater size. It is observed that rays of craters more than 1 b.y. old remain bright, whereas those older than Class 1 generally fade to imperceptibility.

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