bgcolor=#d6d6d6 | 20411 || || — || August 24, 1998 || Socorro || LINEAR || URS || align=right | 11 km || |-id=412 bgcolor=#d6d6d6 | 20412 || || — || August 24, 1998 || Socorro || LINEAR || EOS || align=right | 12 km || |-id=413 bgcolor=#fefefe | 20413 || || — || August 28, 1998 || Socorro || LINEAR || — || align=right | 2.3 km || |-id=414 bgcolor=#d6d6d6 | 20414 || || — || September 9, 1998 || Caussols || ODAS || — || align=right | 8.1 km || |-id=415 bgcolor=#fefefe | 20415 Amandalu || || || September 14, 1998 || Socorro || LINEAR || FLO || align=right | 3.3 km || |-id=416 bgcolor=#E9E9E9 | 20416 Mansour || || || September 14, 1998 || Socorro || LINEAR || — || align=right | 5.8 km || |-id=417 bgcolor=#E9E9E9 | 20417 || || — || September 20, 1998 || Kitt Peak || Spacewatch || — || align=right | 8.3 km || |-id=418 bgcolor=#fefefe | 20418 || || — || September 21, 1998 || La Silla || E. W. Elst || NYS || align=right | 2.1 km || |-id=419 bgcolor=#fefefe | 20419 || || — || September 26, 1998 || Socorro || LINEAR || — || align=right | 4.5 km || |-id=420 bgcolor=#E9E9E9 | 20420 Marashwhitman || || || September 26, 1998 || Socorro || LINEAR || — || align=right | 4.4 km || |-id=421 bgcolor=#fefefe | 20421 || || — || October 14, 1998 || Socorro || LINEAR || PHO || align=right | 4.7 km || |-id=422 bgcolor=#d6d6d6 | 20422 || || — || October 23, 1998 || Višnjan Observatory || K. Korlević || THM || align=right | 13 km || |-id=423 bgcolor=#E9E9E9 | 20423 || || — || November 10, 1998 || Socorro || LINEAR || — || align=right | 7.2 km || |-id=424 bgcolor=#C2FFFF | 20424 || || — || November 10, 1998 || Socorro || LINEAR || L4 || align=right | 46 km || |-id=425 bgcolor=#FFC2E0 | 20425 || || — || November 15, 1998 || Kitt Peak || Spacewatch || APOPHAcritical || align=right data-sort-value="0.30" | 300 m || |-id=426 bgcolor=#d6d6d6 | 20426 Fridlund || || || November 13, 1998 || La Silla || C.-I. Lagerkvist || — || align=right | 13 km || |-id=427 bgcolor=#d6d6d6 | 20427 Hjalmar || || || November 13, 1998 || La Silla || C.-I. Lagerkvist || ALA || align=right | 18