1 1992-02-25.18 Barucci et al. (1994) 2 1992-03-01.23 Barucci et al. (1994) 3 1992-03-04.15 Barucci et al. (1994) 4 1992-03-05.20 Barucci et al. (1994) 5 1998-07-10--2007-08-28 USNO 6 2003-12-13--2007-11-09 Catalina