Physics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..701m&link_type=abstract
Geophysical Research Letters, vol. 3, Dec. 1976, p. 701-704.
Physics
5
Albedo, Ceres Asteroid, Planetary Composition, Size Determination, Vesta Asteroid, Density (Mass/Volume), Meteoritic Composition, Planetology
Scientific paper
Present radiometric and polarimetric measurements of the sizes and albedos of asteroids 1 Ceres and 4 Vesta, although uncertain in absolute calibration, determine the ratio of diameters with sufficient precision (Ceres/Vesta = 1.87 plus or minus 0.03) to permit meaningful discussion of their relative densities. These measurements combined with the known masses yield a ratio of densities Vesta/Ceres = 1.33 plus or minus 0.17, thus demonstrating that: (1) the bulk compositions are likely different, and (2) the difference is consistent with indications from remotely-determined surface composition that Vesta is differentiated while Ceres may be of undifferentiated carbonaceous chondritic composition.
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