Date: Wednesday 28-Feb-2024
Time: 11:30-12:30 pm
Location: PSC 1136
Speaker: Colby Merrill (Cornell University)
Title: The Age of (152830) Dinkinesh I Selam Constrained by Secular Theory
Abstract: The age of the main-belt binary asteroid system, (152830) Dinkinesh, is constrained through secular dynamics assuming the secondary, Selam, is at equilibrium. Selam’s current semi-major axis and rotation period and Dinkinesh’s current rotation period are reproduced starting from spin-up fission event initial conditions. The method presented includes the secular effects of YORP, BYORP, and tidal interactions and allows the relative strengths of these effects to be constrained. Improved equations that describe the tidal-BYORP equilibrium in binary asteroid systems will be presented. These equations are (1) a tidal-BYORP equilibrium equation that scales appropriately with secondary mass and (2) an equation for YORP-driven primary spin stability while the secondary is at equilibrium.
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