Neptune - Natural Color with Satellites
The semi-major axis of Neptune's orbit about the Sun is 30.06 Astronomical Units (A.U.) or roughly 4.5 billion km.
Neptune has a diameter of roughly 30,800 miles (49,600 km) at the equator.
10423: H.B. Hammel (Space Science Institute, Boulder, CO) and E. Karkoschka (University of Arizona)
F250W, F330W, F435W, F475W, F550M, F625W, F658N, F775W, F814W, F850LP, F892N, and FR914M
NASA, ESA, E. Karkoschka (University of Arizona), and H.B. Hammel (Space Science Institute, Boulder, Colorado)