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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 , which is less massive than the primary body.
Thus, m 2 < m 1 {\displaystyle m_{2}
Under standard assumptions in astrodynamics, the barycenter of the two bodies is a focus of both orbits.
An orbiting body may be a spacecraft or a natural satellite, such as a planet, dwarf planet, moon, moonlet, asteroid, or comet.
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