Neptune.

    Mean Distance from the Sun 30.06 AU (4,497.07 million km / 2,725 million miles)
    Period of Revolution (length of year) 164 Earth years
    Period of Rotation 16.1 Earth hours
    Length of day 16.1 Earth hours
    Inclination 1.8 degrees
    Equatorial Diameter 49,528 km (30,775 miles)

    Original image located at: http://photojournal.jpl.nasa.gov/index.html