(13421) Holvorcem
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( 13421 ) Holvorcem is an asteroid of the main belt, which on 11 November 1999 by the U.S. amateur astronomer Charles W. Juels at Fountain Hills Observatory (IAU code 678 ) was discovered in Fountain Hills, Arizona.
The asteroid was named after the Brazilian amateur astronomer Paulo R. Holvorcem, which was awarded the Harvard - Smithsonian Comet Award 2003.