Assumed Size
When 2003 QX113 was first discovered it was estimated to have an absolute magnitude (H) of 4.9 giving it an assumed size of only 461 km in diameter. As of 2010, 2003 QX113 is estimated to have a brighter absolute magnitude (H) of 4.7. Assuming it is a trans-Neptunian object with a generic albedo of 0.09, it is about 505 km in diameter.
It has been observed 23 times over 6 oppositions and has an orbit quality of 4.
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