31399 Susorney || || || December 24, 1998 || Anderson Mesa || LONEOS || EUNslow || align=right | 7.2 km || |-id=400 bgcolor=#fefefe | 31400 Dakshdua || || || December 16, 1998 || Socorro || LINEAR || NYS || align=right | 2.5 km || |} 31401–31500 |-bgcolor=#E9E9E9 | 31401 || 1999 AK || — || January 6, 1999 || Višnjan Observatory || K. Korlević || — || align=right | 8.9 km || |-id=402 bgcolor=#E9E9E9 | 31402 Negishi || 1999 AR || || January 7, 1999 || Oizumi || T. Kobayashi || GER || align=right | 9.6 km || |-id=403 bgcolor=#fefefe | 31403 || 1999 AV || — || January 7, 1999 || Oizumi || T. Kobayashi || — || align=right | 2.9 km || |-id=404 bgcolor=#fefefe | 31404 || || — || January 7, 1999 || Kitt Peak || Spacewatch || — || align=right | 1.8 km || |-id=405 bgcolor=#fefefe | 31405 || || — || January 9, 1999 || Oizumi || T. Kobayashi || FLO || align=right | 3.3 km || |-id=406 bgcolor=#fefefe | 31406 || || — || January 10, 1999 || Oizumi || T. Kobayashi || — || align=right | 3.8 km || |-id=407 bgcolor=#E9E9E9 | 31407 || || — || January 11, 1999 || Oizumi || T. Kobayashi || — || align=right | 7.1 km || |-id=408 bgcolor=#fefefe | 31408 || || — || January 11, 1999 || Oizumi || T. Kobayashi || NYS || align=right | 3.7 km || |-id=409 bgcolor=#fefefe | 31409 || || — || January 11, 1999 || Oizumi || T. Kobayashi || FLO || align=right | 4.1 km || |-id=410 bgcolor=#fefefe | 31410 || || — || January 12, 1999 || Oizumi || T. Kobayashi || FLO || align=right | 3.4 km || |-id=411 bgcolor=#fefefe | 31411 || || — || January 10, 1999 || Xinglong || SCAP || — || align=right | 2.2 km || |-id=412 bgcolor=#fefefe | 31412 || || — || January 13, 1999 || Anderson Mesa || LONEOS || — || align=right | 2.6 km || |-id=413 bgcolor=#fefefe | 31413 || || — || January 15, 1999 || Višnjan Observatory || K. Korlević || — || align=right | 2.6 km || |-id=414 bgcolor=#fefefe | 31414 Rotarysusa || || || January 14, 1999 || San Marcello || L. Tesi, A. Boattini || — || align=right | 2.8 km || |-id=415 bgcolor=#FA8072 | 31415 || || — || January