1           1999-01-18.96  Denchev (2000) 
2           1999-01-19.94  Denchev (2000) 
3  1997-09-08--2009-02-01  USNO 
4  1999-05-15--2004-07-05  Catalina 
5  2003-12-14--2009-05-12  Catalina