List of asteroids/121401–121500

|| October 6, 1999 || Socorro || LINEAR
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121403 - || || October 6, 1999 || Socorro || LINEAR
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121406 - || || October 6, 1999 || Socorro || LINEAR
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121409 - || || October 6, 1999 || Socorro || LINEAR
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121412 - || || October 7, 1999 || Socorro || LINEAR
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121415 - || || October 7, 1999 || Socorro || LINEAR
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121418 - || || October 7, 1999 || Socorro || LINEAR
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121421 - || || October 7, 1999 || Socorro || LINEAR
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121424 - || || October 7, 1999 || Socorro || LINEAR
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121427 - || || October 10, 1999 || Socorro || LINEAR
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121430 - || || October 10, 1999 || Socorro || LINEAR
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121433 - || || October 10, 1999 || Socorro || LINEAR
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121436 - || || October 12, 1999 || Socorro || LINEAR
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121439 - || || October 12, 1999 || Socorro || LINEAR
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121442 - || || October 12, 1999 || Socorro || LINEAR
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121445 - || || October 12, 1999 || Socorro || LINEAR
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121448 - || || October 12, 1999 || Socorro || LINEAR
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121451 - || || October 12, 1999 || Socorro || LINEAR
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121454 - || || October 14, 1999 || Socorro || LINEAR
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121457 - || || October 14, 1999 || Socorro || LINEAR
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121460 - || || October 14, 1999 || Socorro || LINEAR
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121463 - || || October 15, 1999 || Socorro || LINEAR
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121466 - || || October 1, 1999 || Catalina || CSS
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121469 - || || October 2, 1999 || Kitt Peak || Spacewatch
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121472 - || || October 1, 1999 || Kitt Peak || Spacewatch
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121475 - || || October 7, 1999 || Socorro || LINEAR
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121478 - || || October 4, 1999 || Catalina || CSS
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121481 - || || October 4, 1999 || Catalina || CSS
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121484 - || || October 7, 1999 || Catalina || CSS
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121487 - || || October 9, 1999 || Kitt Peak || Spacewatch
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121490 - || || October 15, 1999 || Anderson Mesa || LONEOS
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121493 - || || October 3, 1999 || Socorro || LINEAR
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121496 - || || October 3, 1999 || Socorro || LINEAR
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121499 - ||