An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 25 Search : body
secondary body
  جسم ِ دومان   
jesm-e dovomân

Fr.: corps secondaire   

A body that revolves around a more massive body under the → gravitational attraction of the latter is called the → primary body.
The less massive component in a → binary system.

secondary; → body.

small solar system body
  جسم ِ کوچک ِ راژمان ِ خورشیدی   
jesm-e kucak-e râžmân-e xoršidi

Fr.: petit corps du système solaire   

A term introduced by the → International Astronomical Union (August 2006) to name the → solar system bodies other than → planets and → dwarf planets. Small solar system bodies include → asteroids, → comets, and → meteoroids.

small; → solar; → system; → body.

three-body problem
  پراسه‌ی ِ سه‌جسم   
parâse-ye sé jesm

Fr.: problème à trois corps   

The mathematical problem of studying the positions and velocities of three mutually attracting bodies (such as the Sun, Earth and Moon) and the stability of their motion. This problem is surprisingly difficult to solve, even in the simple case, called → restricted three-body problem, where one of the masses is taken to be negligibly small so that the problem simplifies to finding the behavior of the mass-less body in the combined gravitational field of the other two. See also → two-body problem, → n-body problem.

three; → body; → problem.

two-body problem
  پراسه‌ی ِ دو جسم   
parâse-ye do jesm

Fr.: problème à deux corps   

In classical mechanics, the study concerned with the dynamics of an isolated system of two particles subject only to the Newtonian gravitational force between them. The problem can be separated into two single-particle problems with the following solutions. The equation of the → center of mass is governed by the equation of the same form as that for a single particle. Moreover, the motion of either particle, with respect to the other as origin, is the same as the motion with respect to a fixed origin of a single particle of → reduced mass acted on by the same internal force. See also → three-body problem, → n-body problem.

two; → body; → problem.

two-body system
  راژمان ِ دو جسم   
râžmân-e do jesm

Fr.: système à deux corps   

A → dynamical system consisting of two masses that interact via → central forces.

two; → body; → system.

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