What is the primary condition regarding primary stellar association for an object to be classified as a planet?
Answer
The object must orbit the Sun, not around another planet.
The foundational requirement for an object to even be considered for planetary status is its relationship to the central star. The IAU definition explicitly states that a planet must orbit the Sun directly. If an object's primary orbit is around another planet—making it a moon or satellite of that body—it is immediately disqualified from being classified as a full-fledged planet, regardless of its size or shape, thereby establishing its status relative to the solar system's primary gravitational anchor.
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