|| align=right | 5.9 km || |-id=581 bgcolor=#d6d6d6 | 91581 || || — || September 30, 1999 || Catalina || CSS || — || align=right | 6.0 km || |-id=582 bgcolor=#d6d6d6 | 91582 || || — || September 30, 1999 || Socorro || LINEAR || — || align=right | 4.0 km || |-id=583 bgcolor=#d6d6d6 | 91583 || || — || September 30, 1999 || Socorro || LINEAR || — || align=right | 5.3 km || |-id=584 bgcolor=#E9E9E9 | 91584 || || — || September 30, 1999 || Socorro || LINEAR || — || align=right | 6.4 km || |-id=585 bgcolor=#E9E9E9 | 91585 || || — || September 30, 1999 || Socorro || LINEAR || GEF || align=right | 3.1 km || |-id=586 bgcolor=#d6d6d6 | 91586 || || — || September 30, 1999 || Kitt Peak || Spacewatch || — || align=right | 4.3 km || |-id=587 bgcolor=#d6d6d6 | 91587 || || — || September 29, 1999 || Catalina || CSS || EOS || align=right | 4.2 km || |-id=588 bgcolor=#d6d6d6 | 91588 || 1999 TJ || — || October 2, 1999 || Prescott || P. G. Comba || — || align=right | 4.4 km || |-id=589 bgcolor=#d6d6d6 | 91589 || || — || October 1, 1999 || Višnjan Observatory || K. Korlević || — || align=right | 5.9 km || |-id=590 bgcolor=#d6d6d6 | 91590 || || — || October 3, 1999 || Fountain Hills || C. W. Juels || EOS || align=right | 7.5 km || |-id=591 bgcolor=#d6d6d6 | 91591 || || — || October 4, 1999 || Prescott || P. G. Comba || — || align=right | 5.0 km || |-id=592 bgcolor=#d6d6d6 | 91592 || || — || October 2, 1999 || Ondřejov || L. Kotková || EOS || align=right | 6.2 km || |-id=593 bgcolor=#d6d6d6 | 91593 || || — || October 6, 1999 || Višnjan Observatory || K. Korlević, M. Jurić || — || align=right | 6.2 km || |-id=594 bgcolor=#d6d6d6 | 91594 || || — || October 6, 1999 || Višnjan Observatory || K. Korlević, M. Jurić || — || align=right | 5.7 km || |-id=595 bgcolor=#E9E9E9 | 91595 || || — || October 9, 1999 || Prescott || P. G. Comba || — || align=right | 2.3 km || |-id=596 bgcolor=#d6d6d6 | 91596 || || — || October 9, 1999 || Fountain Hills || C. W. Juels || — || align=right | 4.1 km ||