Neptune Ring Arcs and Moons (unannotated)
The semi-major axis of Neptune's orbit about the Sun is 30.06 astronomical units (roughly 2.8 billion miles or 4.5 billion kilometers).
This image was created from HST data from proposal 11656: M. Showalter (SETI Institute), I. de Pater (University of California, Berkeley), and J. Lissauer (NASA Ames Research Center).
NASA, ESA, and M. Showalter (SETI Institute)
Grayscale: F606W (V)