Asteroid rotation rates depend on diameter and type

Details Asteroid rotation rates depend on diameter and type Asteroid rotation rates depend on diameter and type

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.296..418d&link_type=abstract

Nature, vol. 296, Apr. 1, 1982, p. 418-421.

Physics

23

Angular Velocity, Asteroids, Diameters, Planetary Rotation, Rotating Bodies, Frequency Control, Surface Properties, Wave Dispersion, Asteroids, Rotation, Diameter, M Asteroids, S Asteroids, C Asteroids, Classification, Characteristics, Frequencies, Data, Data Reduction, Photoelectric Observations, Velocity, Statistical Analysis

Scientific paper

The rotational frequency of main-belt asteroids is shown to depend on both asteroidal type and diameter. If asteroids of any one diameter are considered, then, on average, M asteroids rotate faster than S asteroids which in turn rotate faster than C asteroids. Thus, asteroids which have been classified by their surface properties alone have different bulk properties. For all three types, although the dispersions of the frequencies are large, it is shown that the mean frequency increases linearly with the mean diameter. In both the C and S plots of mean rotational frequency against mean diameter there are discontinuities at diameters of about 125 km and 105 km, respectively, which may differentiate primordial asteroids from their collisional products.

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