Neptune

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).

Neptune has a diameter of roughly 30,800 miles (49,600 kilometers) at the equator.

Data were provided by the HST proposal 14492: M.H. Wong (PI), I. de Pater, J. Tollefson, and K. de Kleer (UC Berkeley), H. Hammel (Space Science Institute), S. Cook (AMNH), R. Hueso and A. Sanchez-Lavega (University of the Basque Country, Spain), A. Simon (NASA/GSFC), M. Delcroix (French Astronomical Society, SAF), L. Sromovsky and P. Fry (University of Wisconsin, Madison), G. Orton (JPL), and C. Baranec (University of Hawaii, Manoa).

F467M

NASA, ESA, and M.H. Wong and J. Tollefson (UC Berkeley)

This image is a single, monochrome filter that isolated blue light (F467M) was used to record overall brightness. These brightness values were translated into a range of bluish hues. Such color "maps" can be useful in helping to distinguish subtly varying brightness in an image.

Blue: F467M