1           1989-01-15.43  Wisniewski et al. (1997) 
2           1989-01-16.40  Wisniewski et al. (1997) 
3           1989-01-17.34  Wisniewski et al. (1997) 
4  1998-12-18--2009-01-29  USNO 
5  2005-12-30--2010-10-11  Catalina