The densities and bulk compositions of Ceres and Vesta

Details The densities and bulk compositions of Ceres and Vesta The densities and bulk compositions of Ceres and Vesta

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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