1           1981-02-04.25  Schober (1983) 
2           1981-02-04.26  Schober (1983) 
3           1981-02-04.27  Schober (1983) 
4           1981-02-04.26  Schober (1983) 
5           1981-02-04.27  Schober (1983) 
6           1991-04-24.19  Hainaut-Rouelle et al. (1995) 
7  1998-09-27--2008-01-22  USNO 
8  2005-06-04--2008-01-10  Catalina