Applied Mathematics and Mechanics (English Edition) ›› 2001, Vol. 22 ›› Issue (7): 808-819.

• 论文 • 上一篇    下一篇

DIFFUSION CHARACTERS OF THE ORBITS IN THE ASTEROID MOTION

周礼勇, 孙义燧, 周济林   

  1. Department of Astronomy, Nanjing University, Nanjing 210093, P. R. China
  • 收稿日期:2000-03-31 修回日期:2001-02-13 出版日期:2001-07-18 发布日期:2001-07-18
  • 基金资助:
    the National Natural Science Foundation of China(19633010,19903001)

DIFFUSION CHARACTERS OF THE ORBITS IN THE ASTEROID MOTION

ZHOU Li-yong, SUN Yi-sui, ZHOU Ji-lin   

  1. Department of Astronomy, Nanjing University, Nanjing 210093, P. R. China
  • Received:2000-03-31 Revised:2001-02-13 Online:2001-07-18 Published:2001-07-18
  • Supported by:
    the National Natural Science Foundation of China(19633010,19903001)

摘要: A symplectic mapping is studied carefully. The exponential diffusion law in developed chaotic region and algebraic law in mixed region were observed. An area was found where the diffusion follows a logarithmic law. It is shown in the vicinity of an island, the logarithm of the escape time decreases linearily as the initial position moves away from the island. But when approaching close to the island, the escape time goes up very quickly, consistent with the superexponential stability of the invariant curve. When applied to the motion of asteroid, this mapping’s fixed points and their stabilities give an explanation of the distribution of asteroids. The diffusion velocities in 4:3, 3:2 and 2:1 jovian resonances are also investigated.

Abstract: A symplectic mapping is studied carefully. The exponential diffusion law in developed chaotic region and algebraic law in mixed region were observed. An area was found where the diffusion follows a logarithmic law. It is shown in the vicinity of an island, the logarithm of the escape time decreases linearily as the initial position moves away from the island. But when approaching close to the island, the escape time goes up very quickly, consistent with the superexponential stability of the invariant curve. When applied to the motion of asteroid, this mapping’s fixed points and their stabilities give an explanation of the distribution of asteroids. The diffusion velocities in 4:3, 3:2 and 2:1 jovian resonances are also investigated.

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