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Dynamical configuration of binary near-Earth asteroid (66391) 1999 KW4.

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  • 1Department of Aerospace Engineering, University of Michigan, 1320 Beal Avenue, Ann Arbor, MI 48109-2140, USA. scheeres@umich.edu

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Dynamical simulations reveal solar perturbations excite asteroid 66391 (1999 KW4)

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Area of Science:

  • Planetary Science
  • Astrodynamics
  • Celestial Mechanics

Background:

  • Binary near-Earth asteroids exhibit complex rotational and orbital dynamics.
  • Solar perturbations, especially during perihelion, can significantly influence asteroid dynamics.

Purpose of the Study:

  • To investigate the dynamical simulations of coupled rotational and orbital dynamics of binary near-Earth asteroid 66391 (1999 KW4).
  • To understand the excitation mechanisms and their impact on the asteroid's components.

Main Methods:

  • Performed dynamical simulations of the coupled rotational and orbital motions.
  • Analyzed the effects of solar perturbations during perihelion passages.

Main Results:

  • Solar perturbations during perihelion passages excite the mutual orbit of asteroid 66391 (1999 KW4).
  • Complex fluctuations in orbit and rotation occur in both components.
  • The smaller component exhibits significant attitude variations across different orbits.

Conclusions:

  • The asteroid's current state suggests an origin from spin-up and disruption of a loosely bound precursor.
  • This event likely occurred within the past million years.
  • The primary component's proximity to its rotational stability limit supports this hypothesis.