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Response to leveymg (Reply #2)

Thu May 30, 2013, 08:50 PM

6. When did the IAU declare 1998 QE to be a dwarf planet?

Yes, it has a moon. But that's not enough. Wikipedia currently asserts that:

Ceres, minor-planet designation 1 Ceres, is the only dwarf planet in the inner Solar System, and the largest asteroid. It is a rock–ice body 950 km (590 mi) in diameter, and the smallest identified dwarf planet.


1998 QE2 is only 1.7 miles in diameter. It looks round-ish, from the radar images. But is it round enough to determine that it has assumed hydrostatic equilibrium? Do we know that it has cleared its neighborhood? Does its orbit avoid the orbits of all other more massive asteroids so it can assert gravitational dominance?

I'm awaiting the official word from the IAU.

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