G-pluto.T.gif (1179 bytes) Exploring The Planets

The Other Dwarf Planets

Ceres Rotation
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NASA, ESA, and J.Parker (Southwest Research Institute)

First sighted in 1801 by Italian astronomer Giuseppe Piazzi, Ceres was the first and largest asteroid to be discovered. It takes only 9 hours to rotate on its axis.  The Hubble Space Telescope imaged different faces of Ceres in 2003 and 2004.

2003 UB313

The body designated 2003 UB313 is a cold world that is larger than Pluto and more than three times farther from the Sun .  Mike Brown of Caltech, Chad Trujillo of the Gemini Observatory, and David Rabinowitz of Yale discovered the object in 2005 as they analyzed imagery collected over a year earlier. 

New Planet
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Samuel Oschin Telescope, Palomar Observatory

This composite of 3 images taken 90 minutes apart shows the movement of 2003 UB313.

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