As of March 13, 1997, Pluto is at 29.963 Astronomical Units, and Neptune is at 30.153 where 1 AU = 93 million miles. Neptune has been the farthest planet since February 7, 1979, but on February 10, 1999, Pluto will once again scoot beyond neptune's orbit and regain its former status as the farthest planet in our solar system.