An Earth Encounter as the Cause of Chaotic Dynamics in Binary Asteroid (35107) 1991VH

被引：0

作者：

Meyer, Alex J. ^{[1
]}

Fuentes-Munoz, Oscar ^{[1
]}

Gkolias, Ioannis ^{[2
]}

Tsiganis, Kleomenis ^{[2
]}

Pravec, Petr ^{[3
]}

Naidu, Shantanu ^{[4
]}

Scheeres, Daniel J. ^{[1
]}

机构：

[1] Univ Colorado Boulder, Smead Dept Aerosp Engn Sci, 3775 Discover Dr, Boulder, CO 80303 USA

[2] Aristotle Univ Thessaloniki, Thessaloniki, Greece

[3] Acad Sci Czech Republ, Astron Inst, Fricova 298, CZ-25165 Ondrejov, Czech Republic

[4] CALTECH, Jet Prop Lab, Pasadena, CA USA

来源：

PLANETARY SCIENCE JOURNAL | 2024年 / 5卷 / 08期

基金：

美国国家航空航天局;

关键词：

RELATIVE EQUILIBRIA; DISSIPATION; SATELLITE; EVOLUTION; STATE; SPINS;

D O I：

10.3847/PSJ/ad6605

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Among binary asteroids, (35107) 1991VH stands out as unique given the likely chaotic rotation within its secondary component. The source of this excited dynamical state is unknown. In this work, we demonstrate that a past close encounter with Earth could have provided the necessary perturbation to allow the natural internal dynamics, characterized by spin-orbit coupling, to evolve the system into its current dynamical state. In this hypothesis, the secondary of 1991VH was previously in a classical 1:1 spin-orbit resonance with an orbit period likely between 28 and 35 hr before being perturbed by an Earth encounter within similar to 80,000 km. We find that if the energy dissipation within the secondary is relatively inefficient, this excited dynamical state could persist to today and produce the observed ground-based measurements. Coupled with the orbital history of 1991VH, we can then place a constraint on the tidal dissipation parameters of the secondary.

引用

页数：13