The semi-major axis of Uranus's orbit about the sun is 19.18 Astronomical Units (A.U.) or roughly 4.5 billion km.
Uranus (without rings) has a diameter of roughly 32,000 miles (51,000 km) at the equator.
The Hubble image was created from HST data from proposals 10473: M. Showalter (SETI Institute) and J. Lissauer (NASA Ames Research Center), and 10870, and 11292: M. Showalter (SETI Institute), R. French (Wellesley College), D. Hamilton (University of Maryland), J. Lissauer (NASA Ames Research Center), and P. Nicholson (Cornell University).
F450W (B), F606W (V), F814W (I)