List of asteroids/121001–121100

|| December 22, 1998 || Kitt Peak || Spacewatch
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121003 - || || December 22, 1998 || Kitt Peak || Spacewatch
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121006 - || || January 14, 1999 || Catalina || CSS
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121009 - || || January 13, 1999 || Kitt Peak || Spacewatch
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121012 - || || January 13, 1999 || Xinglong || BAO Schmidt CCD Asteroid Program
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121015 - || || January 19, 1999 || San Marcello || A. Boattini, M. Tombelli
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121018 - || || January 22, 1999 || Višnjan Observatory || K. Korlević
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121021 - || || January 18, 1999 || Socorro || LINEAR
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121024 - || || January 16, 1999 || Kitt Peak || Spacewatch
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121027 - || || January 18, 1999 || Kitt Peak || Spacewatch
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121030 - || || January 23, 1999 || Catalina || CSS
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121033 - || 1999 CU || February 5, 1999 || Oizumi || T. Kobayashi
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121034 - || || February 10, 1999 || Socorro || LINEAR
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121037 - || || February 12, 1999 || Socorro || LINEAR
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121040 - || || February 11, 1999 || Socorro || LINEAR
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121043 - || || February 10, 1999 || Socorro || LINEAR
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121046 - || || February 10, 1999 || Socorro || LINEAR
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121049 - || || February 10, 1999 || Socorro || LINEAR
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121052 - || || February 12, 1999 || Socorro || LINEAR
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121055 - || || February 10, 1999 || Socorro || LINEAR
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121058 - || || February 12, 1999 || Socorro || LINEAR
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121061 - || || February 11, 1999 || Socorro || LINEAR
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121064 - || || February 8, 1999 || Kitt Peak || Spacewatch
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121067 - || || February 13, 1999 || Kitt Peak || Spacewatch
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121070 - || || February 17, 1999 || Farpoint || G. Hug, G. Bell
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121073 - || || March 17, 1999 || Kitt Peak || Spacewatch
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121076 - || || March 19, 1999 || Socorro || LINEAR
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121079 - || || March 20, 1999 || Socorro || LINEAR
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121082 - || || March 23, 1999 || Kitt Peak || Spacewatch
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121085 - || || March 22, 1999 || Anderson Mesa || LONEOS
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121088 - || || March 19, 1999 || Socorro || LINEAR
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121091 - || || March 20, 1999 || Socorro || LINEAR
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121094 - || || March 20, 1999 || Socorro || LINEAR
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121097 - || || March 20, 1999 || Socorro || LINEAR
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121100 - ||