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Orbital Dynamics, Chaos in

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Encyclopedia of Complexity and Systems Science
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Definition of the Subject

By the term orbital dynamics we mean the study of the motion of one or more bodies. Motion is one of the first things that a human being noticed, since the very early stages of human life. Apart from the motion of himself, walking around, he also realized that everything around him is not still, but changes position, being it a wild animal, a dry leaf drifting in the wind, the motion of clouds in the sky, or the change of the position of the celestial bodies, most notably of the Sun and the Moon.

Evidently, motion is one of the most important aspects in everyday life. By the term motion we mean the change of the position of one or more bodies in space, with respect to the other bodies in that region. If only one body existed in the universe, motion could not be defined. This makes necessary the introduction of an important notion in physics, the frame of reference. The surface of the Earth, for example, defines a frame of...

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Abbreviations

Reference frame :

reference frame can be determined by a set of solid bodies, through which we can define a three dimensional geometric figure, for example a triedron (three non planar axes starting from a point). The surface of the Earth can be used to define a reference system. A moving car can be also used to define a reference frame, different from the first one.

Inertial frame :

An inertial frame is a special class of reference frames, in which the basic laws of motion (Newton's laws) are valid. According to Galileos' Principle of Relativity , any frame of reference moving uniformly (with constant velocity without rotation) with respect to an inertial frame is also an inertial frame. A frame of reference which is rotating with respect to an inertial frame is not inertial. The criterion for a frame to be inertial is Newton's first law to be valid. This means that in an inertial frame a free body is either at rest or moves in a straight line with constant velocity. The best approximation in nature of an inertial frame is that frame which is defined by a triedron whose origin is at the center of mass of our Solar System and its three axes are in three fixed directions in space, defined by three distant stars.

Degrees of freedom:

The number of independent variables that are needed to determine the position of a dynamical system is called the number of degrees of freedom . For example, a particle moving freely in space has three degrees of freedom, since its position is determined by its three Cartesian coordinates (\( { x_1,x_2,x_3 } \)), which are independent.

Phase space:

Consider a space whose coordinates determine exactly the state of the system. This space is called the state space or the phase space of the system. Each point of the phase space determines uniquely the initial conditions of the motion. The evolution of the system in the phase space is represented by a smooth curve, which is called the phase curve. The phase curves do not intersect, otherwise the point of intersection would correspond to two different solutions. The set of all phase curves is called the phase diagram and gives important information of the stable and unstable regions of the phase space. For gravitational systems, the phase space is the space of coordinates and velocities of all the bodies. Usually, instead of the velocities, the moments are used in the definition of the phase space. In a gravitational system with n degrees of freedom, the phase space has \( { 2n } \) dimensions. For example, a body moving in the plane under the action of a force, has two degrees of freedom (coordinates x, y) and its phase space is the four-dimensional space x, y, \( { p_x=m\dot x } \), \( { p_y=m\dot y } \).

Orbit :

An orbit of a body, or a set of bodies, considered as point masses, is the path that the bodies describe in a reference frame. The orbit of the same body or set of bodies is different in different frames of reference.

Periodic orbit :

periodic orbit is the orbit of one or more bodies that repeats itself after a certain time, which is called the period of the periodic orbit. The periodicity property is closely related to the frame of reference to which the motion is referred to. For example, an orbit may be periodic in a rotating frame, but not in the inertial frame. In this latter case, for two or more bodies, it is the relative configuration that is repeated in the inertial frame.

Poincaré map :

The Poincaré map is a method by which we transform the continuous flow of a dynamical system in its n-dimensional phase space, into a discrete map in a reduced phase space. The map is obtained by taking the intersections of the continuous flow in the original phase space with a  surface of section , defined properly. This surface of section is (\( { n-1 } \))-dimensional, in general, or (\( { n-2 } \))-dimensional if an integral of motion exists, which is the energy integral in gravitational systems. These will be explained in detail in Sects. “The Poincaré Map,” “Poincaré Map in Hamiltonian Systems.” A periodic orbit appears as a fixed point on the Poincaré surface of section. The Poincaré map is very useful in the study of ordered and chaotic motion in a dynamical system, especially in systems with few degrees of freedom.

Stability :

The notion of stability refers to the behavior of the orbits in the vicinity of a periodic orbit. If a slight change in the initial conditions results to a new orbit, called the perturbed orbit, which deviates much from the periodic orbit, then the periodic orbit is called unstable. In the gravitational systems that we will study, this deviation is exponential. If on the other hand, the perturbed orbit stays close to the periodic orbit, the periodic orbit is called stable. But there are different aspects of stability. For example, if the perturbed orbit, considered as a geometrical figure, is close to the periodic orbit, then the periodic orbit is called orbitally stable. However, in this latter case it may happen that two bodies, one on the periodic orbit and one on the perturbed orbit, which start very close to each other, may deviate much as each one moves on its own orbit, although the geometric figures of the two orbits are close to each other. In this aspect, the orbit is considered as unstable. A Keplerian elliptic orbit, in the two-body problem, belongs to this latter category. A different type of stability is the asymptotic stability . In this case any perturbed orbit, not only stays in the vicinity of the periodic orbit, but tends asymptotically to the periodic orbit. In gravitational systems asymptotic stability does not appear, unless there exists a dissipation to the system.

Ordered and chaotic motion:

The notion of chaoticity is related to the deviation of a perturbed orbit from a given orbit. It may happen that the perturbed orbit does not deviate much as time goes on. In this case we say that we are in an ordered region . The prediction of the evolution of the system in this case is possible. In some cases however, the perturbed orbit deviates exponentially from the original orbit. Prediction is not possible for a long time. In this latter case we are in a  chaotic region . In general, both ordered and chaotic regions exist in the same dynamical system.

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Hadjidemetriou, J.D. (2009). Orbital Dynamics, Chaos in. In: Meyers, R. (eds) Encyclopedia of Complexity and Systems Science. Springer, New York, NY. https://doi.org/10.1007/978-0-387-30440-3_379

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