Diffusion in the asteroid belt
نویسنده
چکیده
In the beginning we review briefly the evolution of the ideas on the motion of the bodies in our solar system, from Newton’s clockwork Universe to the presently accepted ubiquity of chaotic transport in the asteroid belt. Then we discuss the result of chaotic motion, which is transport in phase space, and we introduce the concept of diffusion of an asteroid in action space. We proceed by reviewing recent work on numerical as well as analytical study of asteroids following chaotic trajectories and we summarize the main results. We present several applications of the theoretical modelling of asteroid motion as diffusion in action space, to problems of specific
منابع مشابه
Numerous Weak Resonances Drive Asteroids towardTerrestrial Planets Orbits
A systematic exploration of the chaotic structure of the asteroid belt is presented, first taking into account only the perturbations provided by the four giant planets and then including also the effects of the inner planets. We find that both the inner belt (a< 2.5 AU) and the outer part of the main belt (a> 2.8 AU) are mostly chaotic. In the outer part of the belt, chaos is due to the presen...
متن کاملRegimes of Stability and Scaling Relations for the Removal Time in the Asteroid Belt: A Simple Kinetic Model and Numerical Tests
We report on our theoretical and numerical results concerning the transport mechanisms in the asteroid belt. We first derive a simple kinetic model of chaotic diffusion and show how it gives rise to some simple correlations (but not laws) between the removal time (the time for an asteroid to experience a qualitative change of dynamical behavior and enter a wide chaotic zone) and the Lyapunov ti...
متن کاملThe Dynamical Evolution of the Asteroid Belt
The asteroid belt helps us in reconstructing the origin and the evolution of the solar system, probably better than the planets themselves. This is because the asteroid belt provides several key constraints that can be used to effectively guide the development, calibration, and validation of evolutionary models. Compared to other small-body populations, such as the Kuiper belt or Oort cloud, th...
متن کاملThe empty primordial asteroid belt
The asteroid belt contains less than a thousandth of Earth's mass and is radially segregated, with S-types dominating the inner belt and C-types the outer belt. It is generally assumed that the belt formed with far more mass and was later strongly depleted. We show that the present-day asteroid belt is consistent with having formed empty, without any planetesimals between Mars and Jupiter's pre...
متن کاملThe Compositional Structure of the Asteroid Belt
The past decade has brought major improvements in large-scale asteroid discovery and characterization with over half a million known asteroids and over 100,000 with some measurement of physical characterization. This explosion of data has allowed us to create a new global picture of the Main Asteroid Belt. Put in context with meteorite measurements and dynamical models, a new and more complete ...
متن کامل