Yarkovsky Semimajor-Axis Drift at the Scale of Asteroid Bennu: A Computed Check Against the Measured Drift

This paper computes the Yarkovsky drift of a Bennu-scale asteroid under a simple thermal-recoil model The headline results from the deposited calculation are: accel = 7.04e-13; dadt_m_per_yr = 267; dadt_mas_per_yr = 0.4. A simple thermal-recoil model is computed for a bennu-scale body and compared with the measured drift. is examined against published small-body observations, and the size of any correction associated with a torsion-type density bound near 9.7 x 10^57 kilograms per cubic metre is evaluated explicitly; at small-body densities that correction is smaller than the classical quantities by more than fifty orders of magnitude and changes no result at the quoted precision. This study is simulated and computed from stated assumptions; it is not a measurement.