|| LINEAR || KOR || align=right | 4.9 km || |-id=858 bgcolor=#d6d6d6 | 21858 Gosal || || || October 7, 1999 || Socorro || LINEAR || KOR || align=right | 6.2 km || |-id=859 bgcolor=#E9E9E9 | 21859 || || — || October 10, 1999 || Socorro || LINEAR || — || align=right | 3.9 km || |-id=860 bgcolor=#E9E9E9 | 21860 Joannaguy || || || October 10, 1999 || Socorro || LINEAR || — || align=right | 4.8 km || |-id=861 bgcolor=#d6d6d6 | 21861 Maryhedberg || || || October 12, 1999 || Socorro || LINEAR || EOS || align=right | 5.0 km || |-id=862 bgcolor=#d6d6d6 | 21862 Joshuajones || || || October 12, 1999 || Socorro || LINEAR || EOS || align=right | 5.0 km || |-id=863 bgcolor=#d6d6d6 | 21863 || || — || October 12, 1999 || Socorro || LINEAR || — || align=right | 12 km || |-id=864 bgcolor=#fefefe | 21864 || || — || October 4, 1999 || Catalina || CSS || — || align=right | 2.6 km || |-id=865 bgcolor=#E9E9E9 | 21865 || || — || October 8, 1999 || Catalina || CSS || EUN || align=right | 5.2 km || |-id=866 bgcolor=#E9E9E9 | 21866 || || — || October 8, 1999 || Catalina || CSS || — || align=right | 2.3 km || |-id=867 bgcolor=#d6d6d6 | 21867 || || — || October 9, 1999 || Socorro || LINEAR || 7:4 || align=right | 15 km || |-id=868 bgcolor=#E9E9E9 | 21868 || || — || October 10, 1999 || Socorro || LINEAR || — || align=right | 9.2 km || |-id=869 bgcolor=#E9E9E9 | 21869 || || — || October 1, 1999 || Catalina || CSS || — || align=right | 7.0 km || |-id=870 bgcolor=#fefefe | 21870 || || — || October 16, 1999 || Višnjan Observatory || K. Korlević || — || align=right | 3.2 km || |-id=871 bgcolor=#fefefe | 21871 || || — || October 17, 1999 || Višnjan Observatory || K. Korlević || FLO || align=right | 3.5 km || |-id=872 bgcolor=#E9E9E9 | 21872 || || — || October 18, 1999 || Xinglong || SCAP || — || align=right | 4.6 km || |-id=873 bgcolor=#d6d6d6 | 21873 Jindřichůvhradec || || || October 29, 1999 || Kleť || J. Tichá, M. Tichý || HYG || align=right | 7.2 km || |-id=874 bgcolor=#fefefe | 21874 || || — || October 18, 1999 || Xinglong || SCAP