Jupiter is so massive the Sun doesn't actually orbit its own center

We picture planets orbiting a fixed, central Sun. In reality, two bodies both circle their shared center of mass — the barycenter — and the Sun is no exception. For almost every planet the difference is trivial, because the Sun outweighs them so overwhelmingly that the barycenter sits deep inside the star.

Jupiter breaks that picture. The giant planet holds more than twice the mass of every other planet combined, and it orbits far enough out that its gravitational leverage really tells. The result: the Sun–Jupiter barycenter lies just outside the Sun’s surface, about 1.07 solar radii from the star’s center — roughly 30,000 miles above the photosphere.

The Sun doesn’t sit still while Jupiter circles it. It traces its own small loop around a point in empty space.

So strictly speaking, the Sun orbits a location that isn’t inside the Sun at all. Every twelve years or so, as Jupiter completes a lap, the star swings around this external pivot in a matching wobble.

That wobble is more than a curiosity — it’s how we hunt for planets around other stars. Detecting the tiny back-and-forth tug a planet exerts on its star is one of the main techniques behind thousands of exoplanet discoveries.