28, 1999 || Socorro || LINEAR || APO +1kmPHA || align=right | 1.3 km || |-id=427 bgcolor=#fefefe | 53427 || || — || September 29, 1999 || Socorro || LINEAR || H || align=right | 1.5 km || |-id=428 bgcolor=#fefefe | 53428 || || — || October 2, 1999 || Fountain Hills || C. W. Juels || H || align=right | 1.6 km || |-id=429 bgcolor=#FFC2E0 | 53429 || || — || October 3, 1999 || Socorro || LINEAR || APOPHAcritical || align=right data-sort-value="0.59" | 590 m || |-id=430 bgcolor=#FFC2E0 | 53430 || || — || October 13, 1999 || Socorro || LINEAR || AMO +1km || align=right | 1.2 km || |-id=431 bgcolor=#FA8072 | 53431 || || — || October 31, 1999 || Socorro || LINEAR || H || align=right | 2.5 km || |-id=432 bgcolor=#FA8072 | 53432 || || — || October 19, 1999 || Socorro || LINEAR || Hmoon || align=right | 2.1 km || |-id=433 bgcolor=#fefefe | 53433 || || — || November 9, 1999 || Oizumi || T. Kobayashi || H || align=right | 2.1 km || |-id=434 bgcolor=#E9E9E9 | 53434 || || — || November 13, 1999 || Oizumi || T. Kobayashi || — || align=right | 5.9 km || |-id=435 bgcolor=#FFC2E0 | 53435 || || — || November 9, 1999 || Catalina || CSS || AMO +1km || align=right | 4.1 km || |-id=436 bgcolor=#C2FFFF | 53436 || || — || November 13, 1999 || Catalina || CSS || L4 || align=right | 28 km || |-id=437 bgcolor=#fefefe | 53437 || || — || November 26, 1999 || Višnjan Observatory || K. Korlević || — || align=right | 2.3 km || |-id=438 bgcolor=#fefefe | 53438 || || — || November 30, 1999 || Oizumi || T. Kobayashi || H || align=right | 2.8 km || |-id=439 bgcolor=#fefefe | 53439 || || — || November 30, 1999 || Oizumi || T. Kobayashi || — || align=right | 4.4 km || |-id=440 bgcolor=#fefefe | 53440 || || — || December 6, 1999 || Socorro || LINEAR || H || align=right | 2.2 km || |-id=441 bgcolor=#fefefe | 53441 || || — || December 7, 1999 || Socorro || LINEAR || — || align=right | 1.5 km || |-id=442 bgcolor=#fefefe | 53442 || || — || December 7, 1999 || Socorro || LINEAR || FLO || align=right | 2.2 km || |-id=443 bgcolor=#fefefe | 53443 ||