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Title: Near-Earth asteroid satellite spins under spin-orbit coupling

We develop a fourth-order numerical integrator to simulate the coupled spin and orbital motions of two rigid bodies having arbitrary mass distributions under the influence of their mutual gravitational potential. We simulate the dynamics of components in well-characterized binary and triple near-Earth asteroid systems and use surface of section plots to map the possible spin configurations of the satellites. For asynchronous satellites, the analysis reveals large regions of phase space where the spin state of the satellite is chaotic. For synchronous satellites, we show that libration amplitudes can reach detectable values even for moderately elongated shapes. The presence of chaotic regions in the phase space has important consequences for the evolution of binary asteroids. It may substantially increase spin synchronization timescales, explain the observed fraction of asychronous binaries, delay BYORP-type evolution, and extend the lifetime of binaries. The variations in spin rate due to large librations also affect the analysis and interpretation of light curve and radar observations.
Authors:
;  [1]
  1. Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA 90095 (United States)
Publication Date:
OSTI Identifier:
22342100
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 149; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; ASTEROIDS; CONFIGURATION; COSMOLOGY; DATA; EARTH PLANET; LIFETIME; L-S COUPLING; MAPS; MASS DISTRIBUTION; PHASE SPACE; PLANETS; RADAR; SATELLITES; SPIN; STABILITY; SURFACES; SYNCHRONIZATION; VISIBLE RADIATION