Saturn's Rings in Ultraviolet Light
The semi-major axis of Saturn's orbit about the sun is 9.5 Astronomical Units (A.U.) or roughly 1.4 billion km.
The planet (without rings) has a diameter of roughly 75,000 miles (120,000 km) at the equator.
This image was created from HST data from proposal 9354: E. Karkoschka and M. Tomasko (University of Arizona)
0.27 micrometer, 0.41 micrometer
NASA and E. Karkoschka (University of Arizona)
Ultraviolet: 0.27-0.47 micrometers