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The first letter shows when the object in space was discovered. The "U" shows the period October 16-31. The second letter shows what order the object was found in the amount of time the first letter represented. A= first, B= 2, C= third, and so on. Basically, Eris (Planet 2003 UB313) was found between October 16-21, and was the second object discovered in that period of time.
(See http://www.NASA.gov/audience/forstudents/5-8/features/F_Tenth_Planet.html for more info)
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