The planet that is approximately 5 AU from the sun is Jupiter.

Here's why:

* AU stands for Astronomical Unit. It's a unit of measurement used to describe distances within our solar system. One AU is the average distance between the Earth and the Sun.

* Jupiter's average distance from the Sun is about 5.2 AU.

While the actual distance can vary slightly due to Jupiter's elliptical orbit, it's the closest planet to 5 AU.