Jupiter Does Not Orbit The Sun - Physics-Astronomy.org

Jupiter Does Not Orbit The Sun

Jupiter, the fifth planet from the sun, gas giant, and subject of the Juno mission, is huge. It's so huge, in fact, that it doesn't actually orbit the sun. Not exactly. With 2.5 times the mass of all the other planets in the solar system combined, it's big enough that the center of gravity between Jupiter and the sun doesn't actually reside inside the sun — rather, at a point in space just above the sun's surface.


Here's how that works.
When a small object orbits a big object in space, the less massive one doesn't really travel in a perfect circle around the larger one. Rather, both objects orbit a combined center of gravity.



In situations we're familiar with — like Earth orbiting the much-larger sun — the center of gravity resides so close to the center of the larger object that the impact of this phenomenon is negligible. The bigger object doesn't seem to move, and the smaller one draws a circle around it.

But reality is always more complicated.

For example: When the International Space Station (ISS) orbits the Earth, both the Earth and the space station orbit their combined center of gravity. But that center of gravity is so absurdly close to the center of the Earth that the planet's motion around the point is impossible to spot — and the ISS describes a near-perfect circle around the whole planet.
The same truth holds when most planets orbit the sun. Sol is just so much larger than Earth, Venus, Mercury, or even Saturn that their centers of mass with the sun all lie deep within the star itself.



Not so with Jupiter.
The gas giant is so big that its center of mass with the sun, or barycenter, actually lies 1.07 solar radii from the middle of the sun — or 7% of a sun-radius above the sun's surface. Both the Sun and Jupiter orbit around that point in space.

This not-to-scale gif from NASA illustrates the effect:
That is, in essence, how Jupiter and the sun move through space together — though the distances and sizes are far different. Jupiter is still only a fraction of the sun's size. But next time someone asks you for a crazy space fact you'll know: Jupiter is so massive, it doesn't orbit the sun.

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