| 31534 || || — || February 13, 1999 || Kitt Peak || Spacewatch || — || align=right | 2.7 km || |-id=535 bgcolor=#E9E9E9 | 31535 || || — || February 13, 1999 || Kitt Peak || Spacewatch || — || align=right | 4.8 km || |-id=536 bgcolor=#d6d6d6 | 31536 || || — || February 8, 1999 || Kitt Peak || Spacewatch || — || align=right | 3.9 km || |-id=537 bgcolor=#fefefe | 31537 || 1999 DZ || — || February 18, 1999 || Višnjan Observatory || K. Korlević || — || align=right | 2.5 km || |-id=538 bgcolor=#fefefe | 31538 || || — || February 17, 1999 || Socorro || LINEAR || — || align=right | 2.3 km || |-id=539 bgcolor=#d6d6d6 | 31539 || || — || February 18, 1999 || Haleakala || NEAT || — || align=right | 21 km || |-id=540 bgcolor=#E9E9E9 | 31540 || || — || February 19, 1999 || Oizumi || T. Kobayashi || MAR || align=right | 8.0 km || |-id=541 bgcolor=#fefefe | 31541 || || — || February 21, 1999 || Oizumi || T. Kobayashi || — || align=right | 2.7 km || |-id=542 bgcolor=#d6d6d6 | 31542 || || — || February 20, 1999 || Nachi-Katsuura || Y. Shimizu, T. Urata || EOS || align=right | 12 km || |-id=543 bgcolor=#E9E9E9 | 31543 || || — || February 17, 1999 || Socorro || LINEAR || — || align=right | 4.4 km || |-id=544 bgcolor=#E9E9E9 | 31544 || || — || February 17, 1999 || Socorro || LINEAR || — || align=right | 5.4 km || |-id=545 bgcolor=#E9E9E9 | 31545 || || — || February 20, 1999 || Socorro || LINEAR || — || align=right | 5.5 km || |-id=546 bgcolor=#E9E9E9 | 31546 || || — || February 20, 1999 || Socorro || LINEAR || — || align=right | 10 km || |-id=547 bgcolor=#E9E9E9 | 31547 || || — || February 20, 1999 || Socorro || LINEAR || — || align=right | 13 km || |-id=548 bgcolor=#E9E9E9 | 31548 || || — || February 20, 1999 || Socorro || LINEAR || — || align=right | 7.2 km || |-id=549 bgcolor=#E9E9E9 | 31549 || || — || February 23, 1999 || Socorro || LINEAR || — || align=right | 5.7 km || |-id=550 bgcolor=#fefefe | 31550 || || — || February 18, 1999 || Anderson Mesa || LONEOS || — || align=right | 2.6