To expand, once again, on this thread: here's some more info about other planetoids that have been discovered so far.
http://www.spacetoday.org/SolSys/KuiperBelt/Quaoar.html
Here's a list from the site of a couple that are note worthy, and compairs their sizes.
Quote:
Sizes Compared
In recent years, astronomers have found several big objects beyond Neptune. Here are the approximate diameters of some discovered objects:
Object
Name Year Discovered Diameter in Miles
Sedna 2004 995
Orcus 2004 995
Quaoar 2002 745
Ixion 2001 660
Varuna 2000 560
Pluto 1930 1429
Earth 7,926
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