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The orbiting body is properly referred to as the secondary body.
It is less massive than the primary body (i.e. ).
Pertaining to astronomy, an orbiting body (sometimes seen as OB) is any object smaller than the body it orbits. These may include, but are not limited to, comets, planets, dwarf planets, moons, and asteroids.
- NASA "Dictionary of Technical Terms for Aerospace Use" http://er.jsc.nasa.gov/SEH/s.html, retrieved 5/11/2010
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