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In astrodynamics, an orbiting body is any physical body that orbits a more massive one, called the primary body. The orbiting body is properly referred to as the secondary body ( m 2 {\displaystyle m_{2}} ), which is less massive than the primary body ( m 1 {\displaystyle m_{1}} ).
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orbiting body primary problem n-body astrodynamics orbits massive secondary displaystyle two bodies system barycenter satellite planet two-body three-body focus spacecraft
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