align=right | 4.5 km || |-id=512 bgcolor=#E9E9E9 | 177512 || || — || March 14, 2004 || Socorro || LINEAR || — || align=right | 3.8 km || |-id=513 bgcolor=#E9E9E9 | 177513 || || — || March 14, 2004 || Socorro || LINEAR || EUN || align=right | 1.9 km || |-id=514 bgcolor=#E9E9E9 | 177514 || || — || March 15, 2004 || Kitt Peak || Spacewatch || — || align=right | 1.9 km || |-id=515 bgcolor=#E9E9E9 | 177515 || || — || March 15, 2004 || Kitt Peak || Spacewatch || — || align=right | 3.2 km || |-id=516 bgcolor=#E9E9E9 | 177516 || || — || March 15, 2004 || Catalina || CSS || — || align=right | 1.1 km || |-id=517 bgcolor=#E9E9E9 | 177517 || || — || March 12, 2004 || Palomar || NEAT || — || align=right | 1.8 km || |-id=518 bgcolor=#E9E9E9 | 177518 || || — || March 15, 2004 || Socorro || LINEAR || — || align=right | 3.9 km || |-id=519 bgcolor=#E9E9E9 | 177519 || || — || March 12, 2004 || Palomar || NEAT || GER || align=right | 2.3 km || |-id=520 bgcolor=#E9E9E9 | 177520 || || — || March 15, 2004 || Socorro || LINEAR || — || align=right | 2.6 km || |-id=521 bgcolor=#d6d6d6 | 177521 || || — || March 14, 2004 || Kitt Peak || Spacewatch || CHA || align=right | 3.2 km || |-id=522 bgcolor=#E9E9E9 | 177522 || || — || March 15, 2004 || Kitt Peak || Spacewatch || AER || align=right | 1.9 km || |-id=523 bgcolor=#E9E9E9 | 177523 || || — || March 15, 2004 || Catalina || CSS || — || align=right | 3.9 km || |-id=524 bgcolor=#E9E9E9 | 177524 || || — || March 15, 2004 || Kitt Peak || Spacewatch || — || align=right | 2.2 km || |-id=525 bgcolor=#E9E9E9 | 177525 || || — || March 16, 2004 || Catalina || CSS || — || align=right | 4.9 km || |-id=526 bgcolor=#E9E9E9 | 177526 || || — || March 23, 2004 || Goodricke-Pigott || R. A. Tucker || — || align=right | 3.9 km || |-id=527 bgcolor=#E9E9E9 | 177527 || || — || March 16, 2004 || Catalina || CSS || — || align=right | 3.0 km || |-id=528 bgcolor=#E9E9E9 | 177528 || || — || March 16, 2004 || Socorro || LINEAR || TIN || align=right |