1           1987-06-16.24  Weidenschilling et al. (1990) 
2           1989-09-09.38  Wisniewski et al. (1997) 
3           1989-09-10.42  Wisniewski et al. (1997) 
4           1989-09-20.33  Wisniewski et al. (1997) 
5  1997-11-08--2008-06-15  USNO 
6  2005-07-05--2007-02-27  Catalina