km || |-id=428 bgcolor=#C2FFFF | 20428 || || — || November 18, 1998 || Socorro || LINEAR || L4 || align=right | 27 km || |-id=429 bgcolor=#FFC2E0 | 20429 || || — || December 16, 1998 || Socorro || LINEAR || APO +1km || align=right | 1.1 km || |-id=430 bgcolor=#E9E9E9 | 20430 Stout || || || January 10, 1999 || Baton Rouge || W. R. Cooney Jr., S. Lazar || — || align=right | 3.4 km || |-id=431 bgcolor=#fefefe | 20431 || || — || January 13, 1999 || Višnjan Observatory || K. Korlević || — || align=right | 2.5 km || |-id=432 bgcolor=#fefefe | 20432 || || — || January 22, 1999 || Oizumi || T. Kobayashi || KLI || align=right | 7.6 km || |-id=433 bgcolor=#d6d6d6 | 20433 Prestinenza || || || February 14, 1999 || Ceccano || G. Masi || URS || align=right | 11 km || |-id=434 bgcolor=#E9E9E9 | 20434 || || — || March 21, 1999 || Višnjan Observatory || K. Korlević || EUN || align=right | 9.3 km || |-id=435 bgcolor=#fefefe | 20435 || || — || March 19, 1999 || Socorro || LINEAR || — || align=right | 4.2 km || |-id=436 bgcolor=#fefefe | 20436 || || — || April 12, 1999 || Socorro || LINEAR || — || align=right | 2.7 km || |-id=437 bgcolor=#fefefe | 20437 Selohusa || || || May 8, 1999 || Catalina || CSS || V || align=right | 2.7 km || |-id=438 bgcolor=#fefefe | 20438 || || — || May 10, 1999 || Socorro || LINEAR || — || align=right | 3.5 km || |-id=439 bgcolor=#fefefe | 20439 || || — || May 10, 1999 || Socorro || LINEAR || NYS || align=right | 4.5 km || |-id=440 bgcolor=#fefefe | 20440 McClintock || || || May 10, 1999 || Socorro || LINEAR || MAS || align=right | 3.7 km || |-id=441 bgcolor=#fefefe | 20441 Elijahmena || || || May 10, 1999 || Socorro || LINEAR || FLO || align=right | 2.7 km || |-id=442 bgcolor=#fefefe | 20442 || || — || May 10, 1999 || Socorro || LINEAR || — || align=right | 2.7 km || |-id=443 bgcolor=#fefefe | 20443 || || — || May 10, 1999 || Socorro || LINEAR || — || align=right | 5.5 km || |-id=444 bgcolor=#fefefe | 20444 Mamesser || || || May 10, 1999 || Socorro || LINEAR || FLO