Here's a breakdown:

* 1 AU is the average distance between the Earth and the Sun.

* Quaoar's orbit is quite elliptical, meaning it varies in its distance from the Sun throughout its orbit.

* At its closest point (perihelion), it's around 41.3 AU from the Sun.

* At its farthest point (aphelion), it's about 46.1 AU from the Sun.

So, 43.7 AU represents the average of these distances, giving us a general idea of how far Quaoar is from the Sun.