"Planet" Sedna
900 times further from the Sun than Earth

        http://www.spaceref.com/news/viewpr.html?pid=13841

At 3/4 the size of Pluto, if you count Pluto as a planet you (arguably) have
to count Sedna as one as well.

____________

10,000 year year.
13 billion kilometres (8 billion miles) away.
After Mars, it is the second reddest object in the solar system.
Estimated Sedna is approximately three-fourths the size of Pluto.
Sedna is likely the largest object found in the solar system since Pluto was
discovered in 1930.
Found Nov. 14, 2003.
At its most distant, Sedna is 130 billion kilometres (84 billion miles) from
the Sun, which is 900 times Earth's solar distance.

Scientists used the fact that even the Spitzer telescope was unable to
detect the heat of the extremely distant, cold object to determine it must
be less than 1,700 kilometres (about 1,000 miles) in diameter, which is
smaller than Pluto. By combining available data, Brown estimated Sedna's
size at about halfway between Pluto and Quaoar, the planetoid discovered by
the same team in 2002.

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