2003 UB313

Well, after the disappointing kicker to yesterday’s discovery of 2003 EL61, that it is not quite as big they thought, here’s another one, “definitely at least as big as Pluto”. So I’ll have to update yesterday’s table:

Things smaller than Mars but at least as big as Pluto:

Name What How big Dist from sun When found
Ganymede satellite of Jupiter 5262 km 5.2 AU 1610
Titan satellite of Saturn 5150 km 9.5 AU 1655
Mercury planet 4879 km 0.4 AU prehistoric
Callisto satellite of Jupiter 4820 km 5.2 AU 1610
Io satellite of Jupiter 3642 km 5.2 AU 1610
Luna satellite of Earth 3476 km 1.0 AU prehistoric
Europa satellite of Jupiter 3121 km 5.2 AU 1610
2003 UN313 ?planet ?3000 km 67.7 AU 2005
Triton satellite of Neptune 2706 km 30.1 AU 1846
Pluto planet 2390 km 39.5 AU 1930
2003 EL61 ?planet ?2000 km 43.3 AU 2005

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