However, it's important to note that Jupiter is a gas giant and doesn't rotate like a solid body. Different parts of the planet rotate at slightly different speeds. This is why we refer to two different rotation periods:

* System III: This is the period based on the rotation of Jupiter's magnetic field, which is considered the most accurate measure of the planet's true rotation. This period is 9 hours 55 minutes and 29.7 seconds.

* System I: This is based on the rotation of features observed in Jupiter's atmosphere, such as the Great Red Spot. This period is slightly longer, at 9 hours 50 minutes and 30 seconds.

So, while both are used to describe Jupiter's rotation, the more accurate and widely accepted figure is the 9 hours 55 minutes and 29.7 seconds based on System III.