But that's not what I am talking about. I am talking about another discovery made by Mike Brown's team, 2003 UB313. A lower limit of the size for this object is a little larger than Pluto, meaning this world is definitely larger than Pluto. Size estimates assuming an albedo of 0.25, or around the albedo of other large bodies in the Kuiper Belt suggest a size around that of Mars.
So definitely an exciting discovery. Again, because this is off-topic from the discussion of outer planet satellites, I will limit discussion of 2003 UB313 to this post, unless of course a moon is found...
UPDATE: 07/29/2005 6:25pm: JPL has a press release now on their site about 2003 UB313. The new planet appears to be 2600 km across with bounds of around 2300 km (assuming it reflects all the light it receives from the sun, an unlikely proposition) and 3000 km (because it failed to be detected by Spitzer). Spectroscopy of 2003 UB313 indicates the presence of methane ice on the surface. In addition, Mike Brown's group has a website about the new planet that might be worth monitoring for the next few days, as well as the Wikipedia page.
UPDATE: 07/29/2005 8:08 pm: Planet not named Lila nor is the proposed name Lila. Please disregard.