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is the average position of all the objects weighed by mass. The Sun is so massive that the Solar System's barycenter frequently lies very near the Sun's center but owing to the mass and distance of the
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planets, the Solar System's barycenter occasionally lies outside the Sun as well, despite the Sun comprising most of the Solar System's mass.
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is the primary for all objects that orbit the star. In the same way, the primary of all satellites (be they
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that could have formally included Pluto and Charon, but this definition was not ratified.
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Pluto's surface. This has led some astronomers to call the Pluto–Charon system a
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bound, multi-object system. This object constitutes most of that system's
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is dubious. Astronomers have not yet detected any bodies (
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A disputed example of a system that may lack a primary is
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392:) that orbit an exoplanet. The use of
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