Some pecularities of asteroid-size distribution

Details Some pecularities of asteroid-size distribution Some pecularities of asteroid-size distribution

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002kfnt...18..516k&link_type=abstract

Kinematika I Fizika Nebesnykh Tel, v. 18, no. 6, p. 483-507

Physics

1

Scientific paper

We selected 98252 asteroids in the orbits with semi-major axes 2.0 < a < 3.5 AU and eccentricities e < 0.35 discovered before 2001 to study the asteroid-size distribution. The sizes for 1870 of the asteroids were taken from the data derived by the IRAS spacecraft. The diameters of the rest of the objects were estimated on the basis of their absolute magnitudes H and mean albedo values for several ranges of heliocentric distances. We derived the parameters k and b in the expression for the asteroid-size distribution dN=kD-bdD for various intervals of D. It turned out that the parameter b is minimal and equal to about 1.1 for D = 70...75 km. With decreasing or increasing D the exponent b increases and ranges up to 4.0 for D<5 km and to about 2.5 for D>100 km. The relationship between b and k is logarithmic: b∝ lg k. The number of asteroids with D>=1 km should be more than 7×106 for the derived values of k and b.

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