Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dps....30.5516m&link_type=abstract
American Astronomical Society, DPS meeting #30, #55.P16; Bulletin of the American Astronomical Society, Vol. 30, p.1450
Other
Scientific paper
We report detailed results of Arecibo and Goldstone radar observations of 30 mainbelt asteroids (MBAs) during 1980-1997. In addition to estimates of radar cross section, radar albedo, and circular polarization ratio, we obtain new pole constraints for several asteroids, with those for 21 Lutetia being particularly restrictive. We carry out statistical analyses of disc-integrated properties (radar albedo and polarization ratio) of all 37 radar-observed MBAs. There is good reason to believe that M asteroids tend to have higher radar albedos and a wider range of albedos than do the other taxonomic classes; there is no evidence that C and S MBAs have different albedo distributions; and there is some suggestion, worthy of future study, that primitive B, F, G, and P asteroids are not as radar-bright as C and S objects. There currently is no statistical evidence that different taxonomic classes have different polarization ratio distributions, despite suggestions to the contrary based on visual inspection of these distributions. The similarity between the C and S albedo distributions implies similar near-surface regolith bulk densities. If typical lunar porosities are assumed, then the hypothesis of ordinary chondritic composition for the S-class asteroids is more consistent with the radar data. Nevertheless, it is possible that some of these targets have high-porosity regoliths of stony-iron composition. Our M-class sample presumably contains both metallic objects (such as Kleopatra and, probably, Psyche) and less metallic objects, some of which might resemble enstatite chondrites.
Campbell Don B.
Chandler John F.
Giorgini Jon D.
Magri Christopher
Mitchell David Leroy
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