List of asteroids/20401–20500

|| July 31, 1998 || Višnjan Observatory || Višnjan Observatory
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20403 Attenborough || || August 24, 1998 || Caussols || ODAS
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20406 - || || August 17, 1998 || Socorro || LINEAR
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20409 - || || August 24, 1998 || Socorro || LINEAR
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20412 - || || September 9, 1998 || Caussols || ODAS
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20415 Amandalu || || September 20, 1998 || Kitt Peak || Spacewatch
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20418 - || || September 26, 1998 || Socorro || LINEAR
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20421 - || || November 10, 1998 || Socorro || LINEAR
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20424 - || || November 13, 1998 || La Silla || C.-I. Lagerkvist
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20427 - || || December 16, 1998 || Socorro || LINEAR
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20430 Stout || || January 22, 1999 || Oizumi || T. Kobayashi
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20433 Prestinenza || || March 19, 1999 || Socorro || LINEAR
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20436 - || || May 10, 1999 || Socorro || LINEAR
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20439 - || || May 10, 1999 || Socorro || LINEAR
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20442 - || || May 10, 1999 || Socorro || LINEAR
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20445 - || || May 15, 1999 || Socorro || LINEAR
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20448 - || || May 13, 1999 || Socorro || LINEAR
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20451 Galeotti || || May 24, 1999 || Socorro || LINEAR
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20454 Pedrajo || || June 8, 1999 || Kitt Peak || Spacewatch
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20457 - || || June 9, 1999 || Socorro || LINEAR
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20460 Robwhiteley || || June 14, 1999 || Kitt Peak || Spacewatch
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20463 - || || June 20, 1999 || Anderson Mesa || LONEOS
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20466 - || || July 13, 1999 || Reedy Creek || J. Broughton
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20469 Dudleymoore || || July 13, 1999 || Socorro || LINEAR
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20472 Mollypettit || || July 13, 1999 || Socorro || LINEAR
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20475 - || || July 14, 1999 || Socorro || LINEAR
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20478 Rutenberg || || July 14, 1999 || Socorro || LINEAR
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20481 Sharples || || July 14, 1999 || Socorro || LINEAR
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20484 Janetsong || || July 12, 1999 || Socorro || LINEAR
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20487 - || || July 22, 1999 || Socorro || LINEAR
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20491 Ericstrege || || July 16, 1999 || Socorro || LINEAR
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20494 - || || August 22, 1999 || Ondřejov || L. Šarounová
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20497 Maenka || 1999 RS || September 4, 1999 || Ondřejov || L. Šarounová
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20498 - || || September 4, 1999 || Catalina || CSS
-List of asteroids/Helper|204